rev2023.7.13.43531. Not the answer you're looking for? Why can many languages' futures not be canceled? 589), Starting the Prompt Design Site: A New Home in our Stack Exchange Neighborhood, Temporary policy: Generative AI (e.g., ChatGPT) is banned. Which spells benefit most from upcasting? I really need this to work because this method needs to be very generic to receive single objects and collections both of unspecified types. The code posted below is what I have so far, what I need will be to get the propertie of T at index i of DataSource in the outer loop. If you're using Generic version IEnumerable, The conversion is straight forward. Popularity 9/10 Helpfulness 6/10 Language csharp. and it makes no sense for me why would you expect to cast single item to IEnumerable. Jamstack is evolving toward a composable web (Ep. c# - Cannot convert type IEnumerable to List // 1. Change the field label name in lightning-record-form component, Pros and cons of semantically-significant capitalization, Baseboard corners seem wrong but contractor tells me this is normal, apt install python3.11 installs multiple versions of python. Enum.ToObject Method (System) | Microsoft Learn Making statements based on opinion; back them up with references or personal experience. Change the field label name in lightning-record-form component, Add the number of occurrences to the list elements. AC line indicator circuit - resistor gets fried. More importantly, one-dimensional arrays implement the IList<> and IReadOnlyList<> generic interfaces (and their base interfaces) for the type of data that they contain. 589), Starting the Prompt Design Site: A New Home in our Stack Exchange Neighborhood, Temporary policy: Generative AI (e.g., ChatGPT) is banned. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Cast Linq IEnumerable to Class that inherits Ienumerable, C# casting question: from IEnumerable to custom type. Old novel featuring travel between planets via tubes that were located at the poles in pools of mercury. (Ep. Not the answer you're looking for? If its an IDictionary then you'd be able to do .ToDictionary() on the IEnumerable Preserving backwards compatibility when adding new keywords. rev2023.7.13.43531. Connect and share knowledge within a single location that is structured and easy to search. If it is a plain IEnumerable then you'll need to create another method that converts it to the correct IEnumerable type, as in the following solution: This is years later, but I solved the List problem. rev2023.7.13.43531. Now, do I need to loop through this object to pull out the properties so that I can use them such as this? Which spells benefit most from upcasting? Examples. To answer to the question, "Do I need to loop through this object" the answer is yes. 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. How to vet a potential financial advisor to avoid being scammed? If not, you could just call Cast(): If you definitely need to get the right type, you'll need to use reflection. Why do some fonts alternate the vertical placement of numerical glyphs in relation to baseline? Why can't Lucene search be used to power LLM applications? If you want it in your original collection, you should have a constructor on the type which takes an IEnumerable (or whatever your collection stores, if it is specific) and then pass the query to the constructor. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Thanks for contributing an answer to Stack Overflow! Is there a way to create fake halftone holes across the entire object that doesn't completely cuts? Performance - I span up some Benchmark .Net tests and included them in the ToDataTable repo. Not the answer you're looking for? How do I store ready-to-eat salad better? I am using extension methods OrderBy and ThenBy to sort my custom collection on multiple fields. ToObject(Type, Byte) Converts the specified 8-bit unsigned integer to an enumeration member. You are correct when saying the same underlying type. Asking for help, clarification, or responding to other answers. How are the dry lake runways at Edwards AFB marked, and how are they maintained? If you're using an implementation of System.Collections.IEnumerable you can do like following to convert it to a List. It is the base interface for all non-generic collections that can be enumerated. Code and documentation is on Github. Which spells benefit most from upcasting? Why is type reinterpretation considered highly problematic in many programming languages? Use the ToList () Method to Convert an IEnumerable to a List in C# In C#, we can use the ToList () method of Linq class to convert an IEnumerable to a list. rev2023.7.13.43531. The Conversion operators in LINQ are useful in converting the type of the elements in a sequence (collection). Need Advice on Installing AC Unit in Antique Wooden Window Frame. This is also creating a new list, rather than casting the original one. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing. In what ways was the Windows NT POSIX implementation unsuited to real use? Cannot convert from an IEnumerable<T> to an ICollection<T> By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Making statements based on opinion; back them up with references or personal experience. For value types it wouldn't make sense since you only have one value (not multiple properties as with object references). 0. Asking for help, clarification, or responding to other answers. Later on I iterate through these to create a report. rev2023.7.13.43531. SelectMany merges many Product/Formula lists into one, Any checks if at least one CanBuy/CanSale property is true. Does GDPR apply when PII is already in the public domain? Derive a key (and not store it) from a passphrase, to be used with AES. Converting from IEnumerable to List [duplicate], Jamstack is evolving toward a composable web (Ep. Avoiding the problem is simply a case of changing "if (myObject is IEnumerable)" to "if (myObject is IList)" in the example given. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. c# - Cast from IEnumerable to IEnumerable It's not ideal though in particular, if source isn't exactly an IEnumerable then the invocation will fail. In my code I changed it into a extension method: Note that the accepted answer has a bug in it relating to nullable types and the DataTable. How do I clone a list so that it doesn't change unexpectedly after assignment? Enumerable.Cast<TResult>(IEnumerable) Method (System.Linq) 589), Starting the Prompt Design Site: A New Home in our Stack Exchange Neighborhood, Temporary policy: Generative AI (e.g., ChatGPT) is banned. Is it legal to cross an internal Schengen border without passport for a day visit. Not the answer you're looking for? If your collection type implements IList (to be able to Add() to it) you could write an extension method: No there isn't. - Uthaiah May 21, 2014 at 5:33 2 MyClass.Inventory doesn't implement IEnumerable<MyClass.Inventory>. The above answer's example for ToDictionary extension, is a List of a primitive type (string), I would like to demonstrate converting a List of a complex type (class) into dictionary.. Why do disk brakes generate "more stopping power" than rim brakes? I could use reflection to get the properties and the values, but that seems a bit inefficient, is there something build-in? Right, I've overlooked that, thanks for pointing to this, makes sense! 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. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing. A player falls asleep during the game and his friend wakes him -- illegal? Not sure what SqlQuery returns but if deferred execution is acceptable, you may be able to do away with the ToList or replace with AsEnumerable to save enumerating the result list twice. IEnumerable is an interface defining a single method GetEnumerator () that returns an IEnumerator interface. How Can I Convert This IEnumerable Obj Into Datatable Or Dataset? Enumerables and collections are fairly different beasts. If you're using Generic version IEnumerable<T>, The conversion is straight forward. So let's check what is the type of the variable. There are actually two methods, one returning IList, which I have refactored successfully, and another returning IList. If you are concerned about the available actions I think you should go for ICollection. Find centralized, trusted content and collaborate around the technologies you use most. I have an IEnumerable list that I'm pulling from a stored procedure in a mySQL database. I just had a little problem with nullable types, that was resolved with tb.Columns.Add(prop.Name, Nullable.GetUnderlyingType(prop.PropertyType) ?? Following your clarification to question and in comments, I would personally declare the returning type of _item.Get("001") to ICollection.
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