Asynchronous task Whenall timeout - Async task WhenAll with timeout

problem ：

Is there a way in the new async dotnet 4.5 library to set a timeout on the Task.WhenAll method. In the new async dotnet 4.5 Is there any way in the Library Task.WhenAll Set timeout on method .I want to fetch several sources and stop after say 5 seconds and skip the sources that weren't finished. I want to get multiple sources and 5 Seconds later, stop and skip the unfinished source .

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Solution ：

Reference resources ： https://stackoom.com/en/question/fJYN