Detailed explanation of EventHandler in C#

This article introduces eventhandler in c# through case examples. Friends who need it can refer to it

No more nonsense, the specific details are as follows:

//这里定义了一个水箱类
public class 水箱
{
  //这是水箱的放水操作
  public void 放水() { }
  //这是水箱的属性
  public double 体积;
  //这是水箱空的事件
  public event EventHandler 水箱空;
}
//这里定义了一个加水器类
public class 加水器
{
  public void 加水(Object sender, EventArgs e)
  {
    //对需要加水的水箱进行加水操作
  }
}
 public class User
{
  public User()
  {
    //实例化水箱类
    水箱1 = new 水箱();
    //实例化加水器类
    加水器1 = new 加水器();
    //加水器注册水箱空事件
    水箱1.水箱空 += new EventHandler(加水器1.加水);
  }
  private 加水器 加水器1;
  private 水箱 水箱1;
}

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C#'s most classic commission Explanation:

Example:

this.Activated += new EventHandler(Form1_Activated);

This is the principle of delegation.

this.Activated=你吃完饭;  
Form1_Activated=喊我一声

This sentence means to put these two things together, which means Call me when you finish eating. I entrust you to call me after you finish your meal. This way I won't have to check after a while to see if you've finished eating. I've already entrusted you with it.

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