Action是一个委托，不需要参数，也没有返回值，参考下面的.NET 委托进化史
https://stackoverflow.com/questions/13260322/how-to-use-net-action-to-execute-a-method-with-unknown-number-of-parameters
I think you're overthinking things a little bit. So let's start from the "margin:0px 0px 1em 30px;padding:0px;border:0px;font-variant-numeric:inherit;font-variant-east-asian:inherit;line-height:inherit;font-family:Arial, 'Helvetica Neue', Helvetica, sans-serif;font-size:15px;vertical-align:baseline;list-style-list-style-image:initial;box-sizing:inherit;color:#242729;">
A lambda expression is a notation to reference a method execution. Example:
x => x + 3
At the most basic level, this is representing a function that takes 1 input, x,
and then returns a value equal to x
+ 3. So in your situation, your expression:
() => DoSomething(15, "Something")
Represents a method taking 0 parameters, and then invoking the method DoSomething(15,
"Something"). The compiler is behind the scenes translating that into a Func or Actiondelegate
for you. So it is in effect:
new Action(delegate()
{
DoSomething(15, "Something")
});
The compiler rewrite of my simple expression above would be:
new Func<int, int>(delegate(int x)
{
return x + 3;
});
Next up, if you want to invoke an action later, the syntax for doing so is fairly straightforward:
Action someMethod = new Action(() => { Console.WriteLine("hello world"); }));
someMethod(); // Invokes the delegate
So if you have a given Action instance,
simply invoking it with the () syntax
is all you need, since Action is
a delegate that takes 0 parameters and returns nothing.
A function is similarly easy:
Func<int, int> previousGuy = x => x + 3;
var result = previousGuy(3); // result is 6
Lastly, if you want to pass along a method to invoke, and you don't have context for the parameters at that point, you can simply wrap your call in an action and invoke that later. For example:
var myAction = new Action(() =>
{
// Some Complex Logic
DoSomething(15, "Something");
// More Complex Logic, etc
});
InvokeLater(myAction);
public void InvokeLater(Action action)
{
action();
}
All of the data is captured in a closure of your method, and thus is saved. So if you can manage to pass along an Action to
your event with the e.Argument property,
all you would need to do would be to call (e.Argument
as Action)().
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