问题
I could not find a direct answer to this question yet in SO. Is there a predefined delegate with void (void) signature?
回答1:
Action has the signature you're looking for. However, it doesn't mean the same thing as Runnable does: Runnable generally indicates that the run() method is intended to be run on a Thread, while Action makes no indication. For that you'd want ThreadStart, which has the same signature, and does make that indication.
If all you need is a delegate with no parameters, Action is what you want. If you're dealing with threads and need to indicate the start method, use ThreadStart.
回答2:
Nope. C# handles threads differently to Java. In Java, the Runnable interface is an alternative to subclassing Thread, but you still have to create a new Thread object, passing the Runnable to a constructor.
Rather than subclassing the Thread class, you simply create a new System.Threading.Thread object and pass it a ThreadStart delegate (this is the function where you do the work). ThreadStart is the exact C# equivalent to Java's Runnable.
However, the Action delegate has the void parameters you speak of.
回答3:
The Action delegate is a void with no parameters.
http://msdn.microsoft.com/en-us/library/system.action.aspx
There are also other signatures with up to 16 parameters.
来源：https://stackoverflow.com/questions/7078736/c-sharp-version-of-java-runnable-delegate