The application of generic delegate in project

Sentiment: The generic delegate basically belongs to a little understanding, but never really used in the project, sometimes feel that there is no suitable scene application, but read the article Artech brother, I understand that the original generic delegate can really do a lot of things, and the effect is often not used by the delegate to achieve.

action<t> Generic delegate: Encapsulates a method that takes only one parameter and does not return a value. You can use this delegate to pass a method as a parameter without explicitly declaring a custom delegate. The method must correspond to the method signature defined by this delegate. That is, the encapsulated method must have a parameter passed to it by value and cannot return a value. Of course, a generic delegate can support only one parameter, and it supports up to four parameters.

A generic delegate is compared to an example of a direct display declaration custom delegate:

1: Display declaration custom delegate:

delegate　void　DisplayMessage(string　message);
public　class　TestCustomDelegate
{
　　　 public　static　void　Main()
　　　 {
　　　　　　 DisplayMessage　messageTarget;
　　　　　　 messageTarget　=　ShowWindowsMessage;
　　　　　　 messageTarget("Hello,　World!");
　　　 }
　　　 private　static　void　ShowWindowsMessage(string　message)
　　　 {
　　　　　　 MessageBox.Show(message);
　　　 }
}

2:action<t> usage. It is obvious that the code is concise compared to the custom delegate.

public　class　TestAction1
{
　　　 public　static　void　Main()
　　　 {
　　　　　　 Action<string>　messageTarget;
　　　　　 messageTarget　=　ShowWindowsMessage;
　　　　　　 messageTarget("Hello,　World!");
　　　 }
　　　 private　static　void　ShowWindowsMessage(string　message)
　　　 {
　　　　　　 MessageBox.Show(message);
　　　 }
}