Return list from async await method

Question

I want to make a webservice request asynchron  I call it here   List lt Item gt  list   GetListAsync      Here is the declaration of my function  which should return a list   private async Task lt List lt Item gt  gt  GetListAsync        List lt Item gt  list   await Task Run      gt  manager GetList         return list      If I want to compile I get the following error  Cannot implicitely convert type System Threading Tasks Task lt System Collections Generic List lt Item gt  gt  to System Collections Generic List lt Item gt    As I know If I use the async modifier the result is automatically wrapped with Task  I think this doesn t happen because I use Task Run  If I remove the Task Run      gt  part I get     Cannot await System Collections Generic List expression   I think I haven t fully understood the async await methods  What I m doing wrong

User · Answer

In addition to  takemyoxygen s answer the convention of having a function name that ends in Async is that this function is truly asynchronous  I e  it does not start a new thread and it doesn t simply call Task Run  If that is all the code that is in your function  it will be better to remove it completely and simply have   List lt Item gt  list   await Task Run      gt  manager GetList

User · Answer

Instead of doing all these  one can simply use   Result  to get the result from a particular task   eg  List list   GetListAsync   Result   Which as per the definition    Gets the result value of this Task  lt  TResult

User · Answer

You need to correct your code to wait for the list to be downloaded   List lt Item gt  list   await GetListAsync      Also  make sure that the method  where this code is located  has async modifier   The reason why you get this error is that GetListAsync method returns a Task lt T gt  which is not a completed result  As your list is downloaded asynchronously  because of Task Run    you need to  extract  the value from the task using the await keyword   If you remove Task Run    you list will be downloaded synchronously and you don t need to use Task  async or await    One more suggestion  you don t need to await in GetListAsync method if the only thing you do is just delegating the operation to a different thread  so you can shorten your code to the following   private Task lt List lt Item gt  gt  GetListAsync        return Task Run      gt  manager GetList

User · Answer

you can use the following private async Task lt List lt string gt  gt  GetItems         return await Task FromResult new List lt string gt                 quot item1 quot    quot item2 quot    quot item3 quot

User · Answer

Works for me   List lt Item gt  list   Task Run      gt  manager GetList    Result    in this way it is not necessary to mark the method with async in the call

[c#] Return list from async/await method

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