How to construct a Task without starting it?

by 
var t = new Task<int>(() => GetIntAsync("3").Result);

Or

var t = new Task<int>((ob) => GetIntAsync((string) ob).Result, "3");

To avoid using lambda, you need to write a static method like this:

private static int GetInt(object state)
{
   return GetIntAsync(((string) state)).Result;
}

And then:

var t = new Task<int>(GetInt, "3");

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