Enumerable.ToList<TSource>(IEnumerable<TSource>) Method (System.Linq The immediate return value is an object that stores all the information that is required to perform the action. Confining signal using stitching vias on a 2 layer PCB, Lateral loading strength of a bicycle wheel, Options to insulate basement electric panel, Looking for advice repairing granite stair tiles. You can append this method to your query in order to obtain a cached copy of the query results. email is in use. This works for read-only access to a collection that implements that IEnumerable can be used with a foreach statement. Does the DM need to declare a Natural 20? You can just use tolist() provided by Linq lamda to convert from IEnumerable to List. What conjunctive function does "ruat caelum" have in "Fiat justitia, ruat caelum"? If you call ToList() just return an IList or ICollection. Thanks, Katie Srini84 (Srinivas) June 15, 2020, 2:49pm 2 Hello @Katie_Vooght You need to place for each and inside for each you can assign a variable to make that string Eg: Mark as solution if this helps for you Thanks 1 Like My mongodb has a colletion called Employee. In alternative to what others have said, you could simply: Since GetHistory modifies the URLs as its side-effect anyway, there is little purpose of returning any result from it. The ToList() method in C# is an alternate method to manipulate these data. The ToList() method returns a list of string instances. Below is an example code to convert IEnumerable to list and back to IEnumerable. Agree Is it possible to notify a user of a new message in my Flutter chat app without Firestore or FCM? The only type conversions that are performed by this method are reference conversions and unboxing conversions. Find centralized, trusted content and collaborate around the technologies you use most. If they don't enumerate the whole lot, then a ToList() would be a waste for me (or the caller) to perform. Why Is PNG file with Drop Shadow in Flutter Web App Grainy? You get that error because myClass.GetHistory(); returns IEnumerable, which is not same as List at compile time, although it is actually List at runtime. Why isn't Summer Solstice plus and minus 90 days the hottest in Northern Hemisphere? //countries.ToList() convert the data collection into the list. - Ocelot20. +1 (416) 849-8900. I get the error: Cannot implicitly convert type 'System.Collections.Generic.IEnumerable' to 'System.Collections.Generic.List'. If a question is poorly phrased then either ask for clarification, ignore it, or. Below is an example code to convert from list to array in C#. How to convert list to dictionary in Python? Also your UserLogin method is void so you can't return anything (you are trying "return user", you can only just "return"). How to extract values from a list of dictionaries and group and convert to a single dictionary . To answer you question, I think that yes you should call ToList before returning the enumeration mainly because your IEnumerable could be an EF query and there's no way for the user of your class to know this, meaning the person could use this enumeration multiple times and launch tons of SQL queries without knowing it (until there would be performance problems and diagnostic would lead to that IEnumerable launching queries). There is a framework called Rx (Reactive Extensions) for .NET that actually has a feature in this built in called Observable.Using(). Cannot implicitly convert type 'object' to 'string'. I can't decide whether my method that returns an IEnumerable should itself be lazy or whether it should build a list and return that. Asking for help, clarification, or responding to other answers. Convert List To IEnumerable In C# - AsEnumerable Method In C# Like every other interface, it exposes a method. If an element cannot be converted to type TResult, this method throws a InvalidCastException. Solution 1 The error message are pretty explicit: 'MyProjectJTable.Models.Student' does not contain a constructor that takes 0 parameters Which means you can't do this: C# a => new Student () You need to look at your Student class and find out which constructors are available, and call one of those with the appropriate parameters. The compiler is told that GetHistory returns IEnumerable, and even though it is a list, it doesn't know that. Understand that English isn't everyone's first language so be lenient of bad IEnumerable is an interface defining a single method GetEnumerator() that returns an IEnumerator interface. An explicit conversion exists (are you missing a cast?). You need to call ToList at the end of your Select in order to get back a list, instead of an IEnumerable. In some applications this solution might not be viable due to the performance impact, and you might feel uneasy about the loss of control here (this is where IoC comes in handy). I didn't downvote it, but I'd guess the reason is the redundant creation of a new list instead of the reuse of the existing one. IEnumerable for the lazy methods makes perfect sense. Is the executive branch obligated to enforce the Supreme Court's decision on affirmative action? I am also not saying "don't care about what the caller does". Microsoft makes no warranties, express or implied, with respect to the information provided here. The best answers are voted up and rise to the top, Not the answer you're looking for? Like every other interface, it exposes a method. @dusky Thanks, I think possibly IReadOnlyList is what I should return in my eager methods (that call ToList()). The correct syntax to use this method is as follows. If you need list operations, you should change your method to return an IList<> instead of IEnumerable. He loves taking on new challenges and believes conceptual programming theories should be implemented in reality. Cannot convert IQueryable<> to IEnumerable<> When did a Prime Minister last miss two, consecutive Prime Minister's Questions? Cannot implicitly convert type 'decimal' to 'int'. Which might be enough for what you ultimately need it for. Question about ActionResult<IEnumerable<Something>> #3224 - GitHub Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. The detail of its parameter is as follows. To get things working you just need to change the return type of your GetHistory() method to List. By using this website, you agree with our Cookies Policy. This article will illustrate converting data from IEnumerable to list in C#. For example: The key part is each enumeration is doing something (GetUserProfile) non trivial, it might be expensive, it might not, but what's the recommendation for a method that returns an IEnumerable? This function returns a list representing the elements of the given IEnumerable. Convert System.Collection.Generic.IEnumerable<System.Text I am saying "don't assume you know better than the caller by forcing them to use. The following example uses both the Cast method and a select statement to convert a sequence of boxed integers to a sequence of doubles. 20 Bay Street, 11th Floor Toronto, Ontario, Canada M5J 2N8 Compiler Error CS0266 | Microsoft Learn ToArray has similar behavior but returns an array instead of a List<T>. How to convert an IEnumerable<> to List<> - UiPath Community Forum Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Convert an IEnumerable to a List in C# | Delft Stack IEnumerable only means you are getting something that can be iterated over (potentially streaming results and making use of deferred execution), and List only means you're getting an in-memory collection that can be added to, removed from, accessed by index, etc. This will limit you to (without further manipulation) the IEnumerable methods (you can do a foreach and use LINQ things like .First, but you can't reference by specific position, for example). Is it possible to bind Route Value to a Custom Attribute's Property in ASP.NET Core Web API. The following code example demonstrates how to use ToList to force immediate query evaluation and return a List that contains the query results. your return type is IEnumerable<ElectorDetail> or List<ElectorDetail> but in your linq, you select new Pe, e.MasterRelationType.RelationTypeDescr } which csharp cannot implicitly convert to IEnummerable<ElectorDetail> what you can do is : create a class(or model) that has e, e.MasterRelationType.RelationTypeDescr properties. I try and avoid IList because ultimately I felt uncomfortable with the result being modified afterwards. you're returning IEnumerable<ProductTypesData> not ActionResult<IEnumerable<ProductTypesData>> Agnib Pyne 2022 7-Feb-23 4:32am Yes. This article will introduce a method to convert an IEnumerable to a list in C#. When doing linq operations it treats almost all collection types as a IEnumerable, which provides a ToList () and a ToArray () method in case you need to cast it back to a list. 2 Answers. The values returned by the IEnumerable interface are read-only. Microsoft makes no warranties, express or implied, with respect to the information provided here. May you kindly help how this can be written without using var? Convert IEnumerable<String> to List<String> - UiPath Community Forum Do large language models know what they are talking about? Difference between machine language and machine code, maybe in the C64 community? Now that you've decided what the return type should be, you have to decide what the implementation should use. rev2023.7.3.43523. Take this example: This can be "remedied" by GetRecordIds calling ToList before returning. This method is implemented by using deferred execution. That is not how IEnumerable works. Thanks for contributing an answer to Code Review Stack Exchange! I'm just bothered by the defered execution of the enumerable.. By clicking Post Your Answer, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct. Converting Lists to Collections in C# and Using Linq on it - C# Corner ). To subscribe to this RSS feed, copy and paste this URL into your RSS reader. dmitri shostakovich vs Dimitri Schostakowitch vs Shostakovitch. Abdullahi is a full-stack developer and technical writer with over 5 years of experience designing and implementing enterprise applications. An explicit conversion exists (are you missing a cast? Return an IEnumerable. Why do most languages use the same token for `EndIf`, `EndWhile`, `EndFunction` and `EndStructure`? The ToList<TSource>(IEnumerable<TSource>) method forces immediate query evaluation and returns a List<T> that contains the query results. cannot convert from 'System.Collections.Generic.List<>' to Do starting intelligence flaws reduce the starting skill count. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. this filter? An explicit conversion exists (are you missing a cast?). The performance cost of using ToList is the same as using new List<>([your enumerable]) constructor, which is an O(n) operation since you need to copy the whole array. Why did Kirk decide to maroon Khan and his people instead of turning them over to Starfleet? Do large language models know what they are talking about? CS8629 - Nullable value type may be null. Your point of view is very interesting. Use MathJax to format equations. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. ), Error: "Cannot implicitly convert type 'long' to 'int'. Cannot implicitly convert type 'bool? ' ), Cannot implicitly convert type 'system.collections.generic.ienumerable' to 'parse.parseobject'. How do I open up this cable box, or remove it entirely? Does a Michigan law make it a felony to purposefully use the wrong gender pronouns? Method returning IEnumerable<T> should ToList() or not If you need list operations, you should change your method to return an IList<> instead of IEnumerable. Why did Kirk decide to maroon Khan and his people instead of turning them over to Starfleet? Non-anarchists often say the existence of prisons deters violent crime. IEnumerable contains only the GetEnumerator method, which returns an IEnumerator object. Is there any political terminology for the leaders who behave like the agents of a bigger power? [Solved]-Cannot convert from IEnumerable<List> to List-LINQ,C# Is the difference between additive groups and multiplicative groups just a matter of notation? An explicit conversion exists (are you missing a cast?). [Solved] Cannot convert type IEnumerable to List | 9to5Answer An explicit conversion exists (are you missing a cast?) Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. How can I specify different theory levels for different atoms in Gaussian? I think the real question here is can the return value be lazily evaluated? Stack Exchange network consists of 182 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. CS8631 - The type cannot be used as type parameter in the generic type or method. The correct syntax to use this method is as follows Enumerable.ToList(source); The method ToList () has one parameter only. To learn more, see our tips on writing great answers. LINQ's .Where returns IEnumerable<T>, your model expects a List<T>, you can either change your model to IEnumerable<T> or you can change this line of code: DependentsDocuments = employee.DependentsDocuments .Where (x => x.dependentId == dependentId) Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Cannot implicitly convert type 'System.Collections.Generic.IEnumerable Again, don't assume the caller is stupid, and don't take away functionality from the caller by making assumptions about how it will be used. Cannot implicitly convert type 'System.Collections.Generic.IEnumerable<T>' to 'Microsoft.AspNetCore.Mvc.ActionResult<System.Collections.Generic.IEnumerable<T>> aspnet/Mvc#8061 rcollette mentioned this issue on Jul 23, 2018 Limitation of ActionResult<T> not mentioned dotnet/AspNetCore.Docs#7777 msftbot bot locked as on Dec 3, 2019 How can I specify different theory levels for different atoms in Gaussian? We make use of First and third party cookies to improve our user experience. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. The compiler is told that GetHistory returns IEnumerable, and even though it is a list, it doesn't know that. Do you need your, CodeProject, Should it care about whether the caller might enumerate it several times or not? Like I mentioned before, there are plenty of acceptable reasons to return a lazily evaluated. This is essentially what this comes down to. If you don't want to use var then you will have to utilize the fact that utlimately whatever is being returned is enumerable. An explicit conversion exists (are you missing a cast? How do you say "What about us?" The Cast<TResult> (IEnumerable) method enables the standard query operators to be invoked on non-generic collections by supplying the necessary type information. However, this doesn't work so well when it comes to sequences that are retrieved from some unmanaged resource. We and our partners use cookies to Store and/or access information on a device. List elements can be accessed or manipulated as follows: The namespace must be imported to use the ToList function as follows: Below is the syntax of the ToList() method. Question of Venn Diagrams and Subsets on a Book. Cannot implicitly convert type 'ORS.DTO.GenderDTO' to 'System.Collections.Generic.IEnumerable'. If you need to do something with each result, you would use a foreach statement: Either change the definition , or the usage. I think you are right. Casts the elements of an IEnumerable to the specified type. Does code that calls the method only expect to iterate over it? In alternative to what others have said, you could simply: Since GetHistory modifies the URLs as its side-effect anyway, there is little purpose of returning any result from it. Is the difference between additive groups and multiplicative groups just a matter of notation? Cannot Convert from Tasks.Task to Generic.List Jul 31 2017 9:39 AM Hi Friends, Am getting the error as below" Error CS1503 Argument 1: cannot convert from 'System.Threading.Tasks.Task<System.Collections.Generic.IEnumerable<Model.Patient>>' to 'System.Collections.Generic.List<Model.Patient>' How expensive it is, may change their implementation decisions. Enumerable.ToArray<TSource>(IEnumerable<TSource>) Method (System.Linq Encryption and Descyption issue in Flutter and C#, Encrypt a file in c# and decrypt in flutter, How many socket will open while listening firestore by DocumentReference. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. passerbycmc, Aug 15, 2016. By clicking Post Your Answer, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct. How do I convert the System.Collection.Generic.IEnumerable<System.Text.RegularExpressions.Match> variable into a String? To get things working you just need to change the return type of your GetHistory() method to List<URL>. The ToList operator in LINQ takes the element from the given source and returns a new list. Further discussion is available via this reference. BindableLayout cannot convert to 'System.Collections.IEnumerable' Your definition of the GetHistory methods returns an IEnumerable, and you are assigning it to an IList. Employee has the following attribute. It only takes a minute to sign up. Should I sell stocks that are performing well or poorly first? from m in table3.ToList () You can typecast a List to an IEnumerable, but not the other way around. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing. Discussion in 'Scripting' started by Quazaka, Aug 15, 2016. The ToArray<TSource>(IEnumerable<TSource>) method forces immediate query evaluation and returns an array that contains the query results. The exception to this is if you can find some way of binding the lifecycle of a connection to an IEnumerable - in other words, can you teach the IEnumerable how to instantiate a connection/other resource, use it, and then dispose it. In the final act, how to drop clues without causing players to feel "cheated" they didn't find them sooner? Method returning IEnumerable should ToList() or not, msdn.microsoft.com/en-us/library/dn467185(v=vs.111).aspx. But still, it's a great answer. Learn more, C# Program to cast a type to its IEnumerable equivalent, Difference between IEnumerator and IEnumerable Interface in C#. How do laws against computer intrusion handle the modern situation of devices routinely being under the de facto control of non-owners? Can I mark the async method (GetProductTypes ()) as Task<actionresult<ienumerable>> too? // declaring a list and passing array elements into the list, // Output Elephant, Accessing elements of a list, // delete 2 elements at starting with element at position 3, //create an array of African countries of type string containing the collection of data. Haunted Places In North Carolina, Faith Lutheran Wrestling, 1441 W 17th St, Santa Ana, Ca 92706, Articles C
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cannot convert ienumerable to list

cannot convert ienumerable to list

To learn more, see our tips on writing great answers. msan (Michel SAN) May 16, 2020, 5:17pm 2 Hello, Have you tried results.ToList () or . To 'bool'. Cannot implicitly convert type 'object' to 'int'. Provide an answer or move on to the next question. Not the answer you're looking for? 1. Enumerable.ToList<TSource>(IEnumerable<TSource>) Method (System.Linq The immediate return value is an object that stores all the information that is required to perform the action. Confining signal using stitching vias on a 2 layer PCB, Lateral loading strength of a bicycle wheel, Options to insulate basement electric panel, Looking for advice repairing granite stair tiles. You can append this method to your query in order to obtain a cached copy of the query results. email is in use. This works for read-only access to a collection that implements that IEnumerable can be used with a foreach statement. Does the DM need to declare a Natural 20? You can just use tolist() provided by Linq lamda to convert from IEnumerable to List. What conjunctive function does "ruat caelum" have in "Fiat justitia, ruat caelum"? If you call ToList() just return an IList or ICollection. Thanks, Katie Srini84 (Srinivas) June 15, 2020, 2:49pm 2 Hello @Katie_Vooght You need to place for each and inside for each you can assign a variable to make that string Eg: Mark as solution if this helps for you Thanks 1 Like My mongodb has a colletion called Employee. In alternative to what others have said, you could simply: Since GetHistory modifies the URLs as its side-effect anyway, there is little purpose of returning any result from it. The ToList() method in C# is an alternate method to manipulate these data. The ToList() method returns a list of string instances. Below is an example code to convert IEnumerable to list and back to IEnumerable. Agree Is it possible to notify a user of a new message in my Flutter chat app without Firestore or FCM? The only type conversions that are performed by this method are reference conversions and unboxing conversions. Find centralized, trusted content and collaborate around the technologies you use most. If they don't enumerate the whole lot, then a ToList() would be a waste for me (or the caller) to perform. Why Is PNG file with Drop Shadow in Flutter Web App Grainy? You get that error because myClass.GetHistory(); returns IEnumerable, which is not same as List at compile time, although it is actually List at runtime. Why isn't Summer Solstice plus and minus 90 days the hottest in Northern Hemisphere? //countries.ToList() convert the data collection into the list. - Ocelot20. +1 (416) 849-8900. I get the error: Cannot implicitly convert type 'System.Collections.Generic.IEnumerable' to 'System.Collections.Generic.List'. If a question is poorly phrased then either ask for clarification, ignore it, or. Below is an example code to convert from list to array in C#. How to convert list to dictionary in Python? Also your UserLogin method is void so you can't return anything (you are trying "return user", you can only just "return"). How to extract values from a list of dictionaries and group and convert to a single dictionary . To answer you question, I think that yes you should call ToList before returning the enumeration mainly because your IEnumerable could be an EF query and there's no way for the user of your class to know this, meaning the person could use this enumeration multiple times and launch tons of SQL queries without knowing it (until there would be performance problems and diagnostic would lead to that IEnumerable launching queries). There is a framework called Rx (Reactive Extensions) for .NET that actually has a feature in this built in called Observable.Using(). Cannot implicitly convert type 'object' to 'string'. I can't decide whether my method that returns an IEnumerable should itself be lazy or whether it should build a list and return that. Asking for help, clarification, or responding to other answers. Convert List To IEnumerable In C# - AsEnumerable Method In C# Like every other interface, it exposes a method. If an element cannot be converted to type TResult, this method throws a InvalidCastException. Solution 1 The error message are pretty explicit: 'MyProjectJTable.Models.Student' does not contain a constructor that takes 0 parameters Which means you can't do this: C# a => new Student () You need to look at your Student class and find out which constructors are available, and call one of those with the appropriate parameters. The compiler is told that GetHistory returns IEnumerable, and even though it is a list, it doesn't know that. Understand that English isn't everyone's first language so be lenient of bad IEnumerable is an interface defining a single method GetEnumerator() that returns an IEnumerator interface. An explicit conversion exists (are you missing a cast?). You need to call ToList at the end of your Select in order to get back a list, instead of an IEnumerable. In some applications this solution might not be viable due to the performance impact, and you might feel uneasy about the loss of control here (this is where IoC comes in handy). I didn't downvote it, but I'd guess the reason is the redundant creation of a new list instead of the reuse of the existing one. IEnumerable for the lazy methods makes perfect sense. Is the executive branch obligated to enforce the Supreme Court's decision on affirmative action? I am also not saying "don't care about what the caller does". Microsoft makes no warranties, express or implied, with respect to the information provided here. The best answers are voted up and rise to the top, Not the answer you're looking for? Like every other interface, it exposes a method. @dusky Thanks, I think possibly IReadOnlyList is what I should return in my eager methods (that call ToList()). The correct syntax to use this method is as follows. If you need list operations, you should change your method to return an IList<> instead of IEnumerable. He loves taking on new challenges and believes conceptual programming theories should be implemented in reality. Cannot convert IQueryable<> to IEnumerable<> When did a Prime Minister last miss two, consecutive Prime Minister's Questions? Cannot implicitly convert type 'decimal' to 'int'. Which might be enough for what you ultimately need it for. Question about ActionResult<IEnumerable<Something>> #3224 - GitHub Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. The detail of its parameter is as follows. To get things working you just need to change the return type of your GetHistory() method to List. By using this website, you agree with our Cookies Policy. This article will illustrate converting data from IEnumerable to list in C#. For example: The key part is each enumeration is doing something (GetUserProfile) non trivial, it might be expensive, it might not, but what's the recommendation for a method that returns an IEnumerable? This function returns a list representing the elements of the given IEnumerable. Convert System.Collection.Generic.IEnumerable<System.Text I am saying "don't assume you know better than the caller by forcing them to use. The following example uses both the Cast method and a select statement to convert a sequence of boxed integers to a sequence of doubles. 20 Bay Street, 11th Floor Toronto, Ontario, Canada M5J 2N8 Compiler Error CS0266 | Microsoft Learn ToArray has similar behavior but returns an array instead of a List<T>. How to convert an IEnumerable<> to List<> - UiPath Community Forum Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Convert an IEnumerable to a List in C# | Delft Stack IEnumerable only means you are getting something that can be iterated over (potentially streaming results and making use of deferred execution), and List only means you're getting an in-memory collection that can be added to, removed from, accessed by index, etc. This will limit you to (without further manipulation) the IEnumerable methods (you can do a foreach and use LINQ things like .First, but you can't reference by specific position, for example). Is it possible to bind Route Value to a Custom Attribute's Property in ASP.NET Core Web API. The following code example demonstrates how to use ToList to force immediate query evaluation and return a List that contains the query results. your return type is IEnumerable<ElectorDetail> or List<ElectorDetail> but in your linq, you select new Pe, e.MasterRelationType.RelationTypeDescr } which csharp cannot implicitly convert to IEnummerable<ElectorDetail> what you can do is : create a class(or model) that has e, e.MasterRelationType.RelationTypeDescr properties. I try and avoid IList because ultimately I felt uncomfortable with the result being modified afterwards. you're returning IEnumerable<ProductTypesData> not ActionResult<IEnumerable<ProductTypesData>> Agnib Pyne 2022 7-Feb-23 4:32am Yes. This article will introduce a method to convert an IEnumerable to a list in C#. When doing linq operations it treats almost all collection types as a IEnumerable, which provides a ToList () and a ToArray () method in case you need to cast it back to a list. 2 Answers. The values returned by the IEnumerable interface are read-only. Microsoft makes no warranties, express or implied, with respect to the information provided here. May you kindly help how this can be written without using var? Convert IEnumerable<String> to List<String> - UiPath Community Forum Do large language models know what they are talking about? Difference between machine language and machine code, maybe in the C64 community? Now that you've decided what the return type should be, you have to decide what the implementation should use. rev2023.7.3.43523. Take this example: This can be "remedied" by GetRecordIds calling ToList before returning. This method is implemented by using deferred execution. That is not how IEnumerable works. Thanks for contributing an answer to Code Review Stack Exchange! I'm just bothered by the defered execution of the enumerable.. By clicking Post Your Answer, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct. Converting Lists to Collections in C# and Using Linq on it - C# Corner ). To subscribe to this RSS feed, copy and paste this URL into your RSS reader. dmitri shostakovich vs Dimitri Schostakowitch vs Shostakovitch. Abdullahi is a full-stack developer and technical writer with over 5 years of experience designing and implementing enterprise applications. An explicit conversion exists (are you missing a cast? Return an IEnumerable. Why do most languages use the same token for `EndIf`, `EndWhile`, `EndFunction` and `EndStructure`? The ToList<TSource>(IEnumerable<TSource>) method forces immediate query evaluation and returns a List<T> that contains the query results. cannot convert from 'System.Collections.Generic.List<>' to Do starting intelligence flaws reduce the starting skill count. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. this filter? An explicit conversion exists (are you missing a cast?). The performance cost of using ToList is the same as using new List<>([your enumerable]) constructor, which is an O(n) operation since you need to copy the whole array. Why did Kirk decide to maroon Khan and his people instead of turning them over to Starfleet? Do large language models know what they are talking about? CS8629 - Nullable value type may be null. Your point of view is very interesting. Use MathJax to format equations. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. ), Error: "Cannot implicitly convert type 'long' to 'int'. Cannot implicitly convert type 'bool? ' ), Cannot implicitly convert type 'system.collections.generic.ienumerable' to 'parse.parseobject'. How do I open up this cable box, or remove it entirely? Does a Michigan law make it a felony to purposefully use the wrong gender pronouns? Method returning IEnumerable<T> should ToList() or not If you need list operations, you should change your method to return an IList<> instead of IEnumerable. Why did Kirk decide to maroon Khan and his people instead of turning them over to Starfleet? Non-anarchists often say the existence of prisons deters violent crime. IEnumerable contains only the GetEnumerator method, which returns an IEnumerator object. Is there any political terminology for the leaders who behave like the agents of a bigger power? [Solved]-Cannot convert from IEnumerable<List> to List-LINQ,C# Is the difference between additive groups and multiplicative groups just a matter of notation? An explicit conversion exists (are you missing a cast?). [Solved] Cannot convert type IEnumerable to List | 9to5Answer An explicit conversion exists (are you missing a cast?) Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. How can I specify different theory levels for different atoms in Gaussian? I think the real question here is can the return value be lazily evaluated? Stack Exchange network consists of 182 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. CS8631 - The type cannot be used as type parameter in the generic type or method. The correct syntax to use this method is as follows Enumerable.ToList(source); The method ToList () has one parameter only. To learn more, see our tips on writing great answers. LINQ's .Where returns IEnumerable<T>, your model expects a List<T>, you can either change your model to IEnumerable<T> or you can change this line of code: DependentsDocuments = employee.DependentsDocuments .Where (x => x.dependentId == dependentId) Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Cannot implicitly convert type 'System.Collections.Generic.IEnumerable Again, don't assume the caller is stupid, and don't take away functionality from the caller by making assumptions about how it will be used. Cannot implicitly convert type 'System.Collections.Generic.IEnumerable<T>' to 'Microsoft.AspNetCore.Mvc.ActionResult<System.Collections.Generic.IEnumerable<T>> aspnet/Mvc#8061 rcollette mentioned this issue on Jul 23, 2018 Limitation of ActionResult<T> not mentioned dotnet/AspNetCore.Docs#7777 msftbot bot locked as on Dec 3, 2019 How can I specify different theory levels for different atoms in Gaussian? We make use of First and third party cookies to improve our user experience. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. The compiler is told that GetHistory returns IEnumerable, and even though it is a list, it doesn't know that. Do you need your, CodeProject, Should it care about whether the caller might enumerate it several times or not? Like I mentioned before, there are plenty of acceptable reasons to return a lazily evaluated. This is essentially what this comes down to. If you don't want to use var then you will have to utilize the fact that utlimately whatever is being returned is enumerable. An explicit conversion exists (are you missing a cast? How do you say "What about us?" The Cast<TResult> (IEnumerable) method enables the standard query operators to be invoked on non-generic collections by supplying the necessary type information. However, this doesn't work so well when it comes to sequences that are retrieved from some unmanaged resource. We and our partners use cookies to Store and/or access information on a device. List elements can be accessed or manipulated as follows: The namespace must be imported to use the ToList function as follows: Below is the syntax of the ToList() method. Question of Venn Diagrams and Subsets on a Book. Cannot implicitly convert type 'ORS.DTO.GenderDTO' to 'System.Collections.Generic.IEnumerable'. If you need to do something with each result, you would use a foreach statement: Either change the definition , or the usage. I think you are right. Casts the elements of an IEnumerable to the specified type. Does code that calls the method only expect to iterate over it? In alternative to what others have said, you could simply: Since GetHistory modifies the URLs as its side-effect anyway, there is little purpose of returning any result from it. Is the difference between additive groups and multiplicative groups just a matter of notation? Cannot Convert from Tasks.Task to Generic.List Jul 31 2017 9:39 AM Hi Friends, Am getting the error as below" Error CS1503 Argument 1: cannot convert from 'System.Threading.Tasks.Task<System.Collections.Generic.IEnumerable<Model.Patient>>' to 'System.Collections.Generic.List<Model.Patient>' How expensive it is, may change their implementation decisions. Enumerable.ToArray<TSource>(IEnumerable<TSource>) Method (System.Linq Encryption and Descyption issue in Flutter and C#, Encrypt a file in c# and decrypt in flutter, How many socket will open while listening firestore by DocumentReference. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. passerbycmc, Aug 15, 2016. By clicking Post Your Answer, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct. How do I convert the System.Collection.Generic.IEnumerable<System.Text.RegularExpressions.Match> variable into a String? To get things working you just need to change the return type of your GetHistory() method to List<URL>. The ToList operator in LINQ takes the element from the given source and returns a new list. Further discussion is available via this reference. BindableLayout cannot convert to 'System.Collections.IEnumerable' Your definition of the GetHistory methods returns an IEnumerable, and you are assigning it to an IList. Employee has the following attribute. It only takes a minute to sign up. Should I sell stocks that are performing well or poorly first? from m in table3.ToList () You can typecast a List to an IEnumerable, but not the other way around. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing. Discussion in 'Scripting' started by Quazaka, Aug 15, 2016. The ToArray<TSource>(IEnumerable<TSource>) method forces immediate query evaluation and returns an array that contains the query results. The exception to this is if you can find some way of binding the lifecycle of a connection to an IEnumerable - in other words, can you teach the IEnumerable how to instantiate a connection/other resource, use it, and then dispose it. In the final act, how to drop clues without causing players to feel "cheated" they didn't find them sooner? Method returning IEnumerable should ToList() or not, msdn.microsoft.com/en-us/library/dn467185(v=vs.111).aspx. But still, it's a great answer. Learn more, C# Program to cast a type to its IEnumerable equivalent, Difference between IEnumerator and IEnumerable Interface in C#. How do laws against computer intrusion handle the modern situation of devices routinely being under the de facto control of non-owners? Can I mark the async method (GetProductTypes ()) as Task<actionresult<ienumerable>> too? // declaring a list and passing array elements into the list, // Output Elephant, Accessing elements of a list, // delete 2 elements at starting with element at position 3, //create an array of African countries of type string containing the collection of data.

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