How to await a list of tasks asynchronously using LINQ?

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LINQ doesn’t work perfectly with async code, but you can do this:

var tasks = foos.Select(DoSomethingAsync).ToList();
await Task.WhenAll(tasks);

If your tasks all return the same type of value, then you can even do this:

var results = await Task.WhenAll(tasks);

which is quite nice. WhenAll returns an array, so I believe your method can return the results directly:

return await Task.WhenAll(tasks);

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