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Task.WhenAll with LINQ select

By : Teniente Dan
Date : August 01 2020, 12:00 PM
Hope that helps First, I recommend forcing enumeration of the tasks (e.g. an extra ToList() call) before sending them anywhere. You wouldn't want to accidentally enumerate the list more than once.
code :
var tasks = orderIds.Select( orderId => GetOrderDetails(orderId) ).ToList();
await Task.WhenAll( tasks );
var orders = tasks.Select( t => t.Result ).Where( o => o != null ).ToList();

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await Task.WhenAll() vs Task.WhenAll().Wait()

By : hao zha
Date : March 29 2020, 07:55 AM
I hope this helps you . await will return to the caller, and resume method execution when the awaited task completes.
WhenAll will create a task **When All* all the tasks are complete.

Implementing multiple Async/Array Tasks via Task.WhenAll (no LINQ)

By : Prashant
Date : March 29 2020, 07:55 AM
To fix the issue you can do MSDN sample (re: https://msdn.microsoft.com/en-us/library/hh556530.aspx) demonstrates this technique of running multiple asynchronous I/O download operations using Async/Await construct and LINQ object library like shown in the following code snippet: , That's fairly simple:
code :
var taskList = new List<Task<int>>();
foreach(var url in urlList) {

Task<int>[] downloadTasks = taskList.ToArray();

can I set a Task.WhenAll() result to a value within a Task.WhenAll() routine?

By : Thuf
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , You could create an async lambda to pass into your Select. This would cause each result to be assigned to the AuthorizedUsers property on the associated instance. The outer Task.WhenAll is only required to know when all elements have been processed.
code :
await Task.WhenAll(appRoleMaps.Select(async x => 
    x.AuthorizedUsers = await GetAuthorizedUsers(x.DomainName, x.ADGroupName)));

Using Async/Await inside nested LINQ-Select without having to use Task.WhenAll

By : goolor
Date : March 29 2020, 07:55 AM
wish help you to fix your issue You don't need to change the type of Column you just need to await the results outside of the initializer for your table. That allows you to collect the results in columnTasks, await all of those and then create your new table.
code :
var result = someList.Select(async table =>
    var columnTasks = table.Select(async column => new Column()
        Constraints = await GetColumnConstraints()
    var columns = await Task.WhenAll(columnTasks);
    return new Table()
        Columns = columns
var tables = await Task.WhenAll(result);

Is there a difference between nesting multiple Task.WhenAll and flattening all tasks into one Task.WhenAll?

By : Rao
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , I think they are the same - HOWEVER I would recommend the first version over the second purely for readability/understandability - its to easy to mistakenly think AlsoDoOtherStuffAsync will only run after DoThisAsync() and DoThatAsync() have both completed in the second version, if you read it to casually, where as all three will actually all run in parallel.
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