You probably want to refactor your code to use IEnumerable.Cast. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing. What's the appropiate way to achieve composition in Godot? I have solved half of the problem by using IEnumerable.Cast() as described here https://stackoverflow.com/a/776407/2109230/. Make sure this using is at the top of your C# file: In case you're working with a regular old System.Collections.IEnumerable instead of IEnumerable you can use enumerable.Cast().ToList(). It's not ideal though in particular, if source isn't exactly an IEnumerable then the invocation will fail. Asking for help, clarification, or responding to other answers. Not the answer you're looking for? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Find centralized, trusted content and collaborate around the technologies you use most. Convert IEnumerable to another IEnumerable C#, How to return a IEnumerable with LINQ Query. LINQ is cool because it treats the source-collections like this as immutable - it is not modifying them. Making statements based on opinion; back them up with references or personal experience. You can checkout my solution in the question. (Ep. If I use IEnumerable am I making it so I can do more actions on Items if needed later in my program? Does each new incarnation of the Doctor retain all the skills displayed by previous incarnations? apt install python3.11 installs multiple versions of python. 1 convert untyped datatable/dataset into strongly typed by: Somebody_Out_There | last post by: Hello, I am trying to create a strongly typed datatable/dataset from an untyped dataset or datatable returned from a stored proc. You can initialize a list with IEnumerable: If items is of type IEnumerable, you can create a list like this: What interfaces does your custom collection implement? Why do disk brakes generate "more stopping power" than rim brakes? Thanks for contributing an answer to Stack Overflow! Link to this answer Share Copy Link . By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Thanks for contributing an answer to Stack Overflow! How i can handle convert List to Common role ? How to mount a public windows share in linux. Is it okay to change the key signature in the middle of a bar? Performance - I span up some Benchmark .Net tests and included them in the ToDataTable repo. The following uses Enumerable.Cast method to convert IEnumerable to a generic List. Is calculating skewness necessary before using the z-score to find outliers? Why do some fonts alternate the vertical placement of numerical glyphs in relation to baseline? Enumerable.Cast<TResult>(IEnumerable) Method (System.Linq) IEnumerable and IQueryable in C# To learn more, see our tips on writing great answers. And so does Method2. Find centralized, trusted content and collaborate around the technologies you use most. How do I make a flat list out of a list of lists? The fix is available at the linked site (http://www.chinhdo.com/20090402/convert-list-to-datatable/) or in my modified code below: Note that both of these example are NOT extension methods like the example above. 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. (Ep. Bulk Merge Example # All arrays implement the non-generic IList interface (and hence non-generic ICollection and IEnumerable base interfaces). 589), Starting the Prompt Design Site: A New Home in our Stack Exchange Neighborhood, Temporary policy: Generative AI (e.g., ChatGPT) is banned. Same issue. Is there a way to create fake halftone holes across the entire object that doesn't completely cuts? To create a collection you will actually have to enumerate the IEnumerable. If you'd like all "people" from your collection, you can write: OfType<Person> How To Convert IEnumerable To one object Ask Question Asked 3 years, 10 months ago Modified 3 years, 10 months ago Viewed 938 times 1 In my Application Users can Have Multiple Roles , I Want To Convert List of Roles To One Common Role Object For Apply Permission How i can handle convert List to Common role ? Is this possible, or is there another way of accomplishing this. Since both are generics, you can do like below. To learn more, see our tips on writing great answers. In the above example, we use the var keyword to create the variable and store the result of the LINQ query. Connect and share knowledge within a single location that is structured and easy to search. C# Transform DataTable into IEnumerable and vice versa Convert / Cast IEnumerable to IEnumerable<T> Is there a way to create fake halftone holes across the entire object that doesn't completely cuts? Which spells benefit most from upcasting? Conclusions from title-drafting and question-content assistance experiments How to convert Object to List in c#? Find centralized, trusted content and collaborate around the technologies you use most. 2022 MIT Integration Bee, Qualifying Round, Question 17. 589), Starting the Prompt Design Site: A New Home in our Stack Exchange Neighborhood, Temporary policy: Generative AI (e.g., ChatGPT) is banned. , which I have refactored successfully, and another returning IList. var myEnumerable = this.GetEnumerator (); var array = myEnumerable.ToArray (); var list myEnumerable.ToList (); Problem is, you're trying to upcast to a richer object. Convert IEnumerable to DataTable? - C# / C Sharp Since GetHistory method returns IEnumerable, Solution: just change the return value of GetHistory() method to IList. rev2023.7.13.43531. Convert collection of IEnumerable using LINQ, Convert Linq ObjectQuery IQueryable to IEnumerable, How to convert given data into IEnumerable object, Convert IEnumerable to List of properties, Convert IEnumerable object list to list of object arrays C#, Convert IEnumerable to another IEnumerable C#, How do I convert IEnumerable to Collection with linq, Help identifying an arcade game from my childhood. I am using extension methods OrderBy and ThenBy to sort my custom collection on multiple fields. You can just use tolist() provided by Linq lamda to convert from IEnumerable to List. A player falls asleep during the game and his friend wakes him -- illegal? [Solved]-C# - Convert IEnumerable to Dictionary<object,string>-wpf Conclusions from title-drafting and question-content assistance experiments Error 107 Cannot implicitly convert type 'System.Collections.Generic.List, Cannot convert IEnumerable type to IEnumerable, Cannot implicitly convert type System.Collections.Generic.IEnumerable to System.Collections.Generic.List, Cannot implicitly convert type Collections.Generic.List to System.Collections.Generic.IEnumerable, Cannot convert System.Collections.Generic.IEnumerable' to 'System.Collections.Generic.List, cannot convert from System.Collections.Generic.List to System.Collections.Generic.IEnumerable, Cannot implicitly convert type 'System.Collections.Generic.List' to 'System.Collections.Generic.IEnumerable. How do I convert IEnumerable to a custom type in C#? IEnumerable to Object? Does your Method2 really care what type it gets? Which spells benefit most from upcasting? This sort does not effect the collection but instead returns and IEnumberable. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Need Advice on Installing AC Unit in Antique Wooden Window Frame. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. difference between Enumerable, Collections and using the ToList(). Does it cost an action? Find centralized, trusted content and collaborate around the technologies you use most. public IEnumerable<T> SqlQuery<T>(string sql) { return expected.OfType<T>(); } In this case, say you have a Person class that is a base class for Cops and Robbers . C# Language Tutorial => Arrays as IEnumerable<> instances Incorrect result of if statement in LaTeX. Connect and share knowledge within a single location that is structured and easy to search. Jamstack is evolving toward a composable web (Ep. Cast/Convert IEnumerable to IEnumerable? I would be okay to use anything that works. Only works with properties (not fields) but it works on Anonymous Types. Other workarounds would be to cast method call result to List<URL>. Connect and share knowledge within a single location that is structured and easy to search. (Ep. At least for my use cases (on .Net Core 2.2). Ask Question Asked 6 years, 8 months ago Modified 11 months ago Viewed 4k times 0 I'm a little confused on how exactly this works. Rather, it uses private implementations (possibly anonymous, possibly not) to provide this functionality. Secondly GetValue is very slow and gets called a lot. Is it ethical to re-submit a manuscript without addressing comments from a particular reviewer while asking the editor to exclude them? If you're using Generic version IEnumerable, The conversion is straight forward. (Ep. c# - Cast from IEnumerable to IEnumerable I have a class (A web control) that has a property of type IEnumerable and would like to work with the parameter using LINQ. its funny, I had the same question, Came up with the same answer, and Im still looking around to see if there's a better way to do it Or an casting operayers, seems better for this case. Making statements based on opinion; back them up with references or personal experience. A player falls asleep during the game and his friend wakes him -- illegal? This works for read-only access to a collection that implements that IEnumerable can be used with a foreach statement. Derive a key (and not store it) from a passphrase, to be used with AES. I encountered the null problem as well. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing, It is important to note that your solution works for the generic version of. 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. Is calculating skewness necessary before using the z-score to find outliers? Is a thumbs-up emoji considered as legally binding agreement in the United States? someICollection = SomeIEnumerable.ToList(); Pending more information on the question: please provide more information on the type of item and the signature of Get. rev2023.7.13.43531. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. How to use a lambda expression to return Collection, Why is the Error Can not convert from ICollection to List, I'm having difficulty switching my IEnumerable implementation to ICollection, Cannot convert IEnumerable type to IEnumerable, Cannot implicitly convert type 'System.Collections.Generic.IEnumerable' to 'System.Collections.Generic.ICollection', Cannot implicitly convert type Collections.Generic.List to System.Collections.Generic.IEnumerable, cannot convert from 'System.Collections.Generic.ICollection' to 'x', Cannot convert from 'System.Collections.IList' to 'System.Collections.Generic.IEnumerable', Implicit conversion from ICollection to IEnumerable. (Ep. Change the field label name in lightning-record-form component, Add the number of occurrences to the list elements. (Ep. Thanks for contributing an answer to Stack Overflow! In my case, I didn't know the type of the IEnumerable. Convert Between Generic IEnumerable : C# 411 - CSharp411.com Is calculating skewness necessary before using the z-score to find outliers? I would use reflection to loop through the properties in a nested foreach loop though correct? class PersonWithAge : Person { public int Age { get; set; } } 2) Create new objects: IEnumerable<Person> p = pwa.Select (p => new Person { Id = p.Id, Name = p.Name }); Share Use ToList () to Convert Data From IEnumerable Into List in C# Use ToList () to Convert Data From Array to List in C# Use ToArray () to Convert Data From List to Array in C# Use AsEnumerable () to Convert Data From List Into IEnumerable in C# This article will illustrate converting data from IEnumerable to list in C#. will it throw an error if my IEnumerable is empty ? if we have class then use below. Once I have the data I would like to run LINQ queries against Items. Look at this one: Convert List/IEnumerable to DataTable/DataView. How do I store ready-to-eat salad better? For list of Formulas and Products you can use SelectMany + Distinct: I'm not suer how ListBools should be produced . Maybe you should group all rules and join Formula/Product per boolData, Btw - I agree with the comments that say the Class/Property names could be be. How Can I Convert This IEnumerable Obj Into Datatable Or Dataset? No. Asking for help, clarification, or responding to other answers. 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. @erikkallen, True, but this is something that the OP should be aware of. Not the answer you're looking for? How can I achieve this? You can't cast an IEnumerable to a List. Code and documentation is on Github. I ended up with another class implementing IList using the original LazyList, to avoid casting object to T: I did duplicate the methods, but it seems there is no other way. [Solved]-string.Join - "cannot convert from IEnumerable to string Why should we take a backup of Office 365? Either use a collection and the Count property (without the parenthesis) or convert it into a foreach loop: You cannot convert directly from IEnumerable to ICollection. Either change the definition , or the usage. The purpose of this is for insertion into excel via ExcelDNA which ideally requires 2d object arrays. Why is type reinterpretation considered highly problematic in many programming languages? With .NET 4 you can just cast source to dynamic before passing it to method. Why is there a current in a changing magnetic field? How do I store ready-to-eat salad better? 589), Starting the Prompt Design Site: A New Home in our Stack Exchange Neighborhood, Temporary policy: Generative AI (e.g., ChatGPT) is banned. How can I convert a DataTable to an IEnumerable>? Right, I've overlooked that, thanks for pointing to this, makes sense! The purpose of this is for insertion into excel via ExcelDNA which ideally requires 2d object arrays. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. I'm attempting to build a generic method that will convert any IEnumerable to an object[,]. Why don't the first two laws of thermodynamics contradict each other? However, I did that and it wasn't that bad. I have been using C# with Unity3d for a few years now, but am just starting with .NET programming. As others have mentioned though, is reflection really necessary? How do I store ready-to-eat salad better? In the inner loop then get the values of each property in turn and insert into the object[,]. to System.Collections.IList, https://stackoverflow.com/a/776407/2109230/, Jamstack is evolving toward a composable web (Ep. Unrelated: poor naming. Making statements based on opinion; back them up with references or personal experience. How to reclassify all contiguous pixels of the same class in a raster? I'm a little confused on how exactly this works. When you implement IEnumerable<T>, you must also implement IEnumerator<T> or, for C# only, you can use the yield keyword. and also some ILGenerator powered solutions (FastMember and Fast.Reflection). This doesn't work if the type is string as the properties are chars and length but the get value then tries to put the full string into the char column.
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