【C#与.net】6.0 事件驱动机制

1.0 事件

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选中组件，在属性栏可以查看事件列表。

image.png

可以双击图形化的按钮，或者双击属性事件列表的click，都可以自动生成点击事件监听方法。
FormMain.cs

        private void InitializeComponent()
        {
            this.btnTest = new System.Windows.Forms.Button();
            this.SuspendLayout();
            // 
            // btnTest
            // 
            this.btnTest.Location = new System.Drawing.Point(364, 175);
            this.btnTest.Name = "btnTest";
            this.btnTest.Size = new System.Drawing.Size(97, 35);
            this.btnTest.TabIndex = 0;
            this.btnTest.Text = "测试按钮的事件";
            this.btnTest.UseVisualStyleBackColor = true;
            this.btnTest.Click += new System.EventHandler(this.btnTest_Click);
            // 
            // FormMain
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(847, 402);
            this.Controls.Add(this.btnTest);
            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle;
            this.Name = "FormMain";
            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
            this.Text = "事件测试";
            this.ResumeLayout(false);

        }

FormMain.Designer.cs

    public partial class FormMain : Form
    {
        public FormMain()
        {
            InitializeComponent();
        }


        //事件响应方法
        private void btnTest_Click(object sender, EventArgs e)
        {
            MessageBox.Show("你好！");
        }

  
    }

2.0 事件关联控制

事件可以根据我们的需要灵活地断开或者关联，比如我们新增两个按钮，代码如下：

 private void InitializeComponent()
        {
            this.btnTest = new System.Windows.Forms.Button();
            this.btnSwitch1 = new System.Windows.Forms.Button();
            this.btnLink = new System.Windows.Forms.Button();
            this.SuspendLayout();
            // 
            // btnTest
            // 
            this.btnTest.Location = new System.Drawing.Point(364, 175);
            this.btnTest.Name = "btnTest";
            this.btnTest.Size = new System.Drawing.Size(97, 35);
            this.btnTest.TabIndex = 0;
            this.btnTest.Text = "测试按钮的事件";
            this.btnTest.UseVisualStyleBackColor = true;
            this.btnTest.Click += new System.EventHandler(this.btnTest_Click);
            // 
            // btnSwitch1
            // 
            this.btnSwitch1.Location = new System.Drawing.Point(33, 23);
            this.btnSwitch1.Name = "btnSwitch1";
            this.btnSwitch1.Size = new System.Drawing.Size(97, 35);
            this.btnSwitch1.TabIndex = 1;
            this.btnSwitch1.Text = "事件断开";
            this.btnSwitch1.UseVisualStyleBackColor = true;
            this.btnSwitch1.Click += new System.EventHandler(this.btnSwitch_Click);
            // 
            // btnLink
            // 
            this.btnLink.Location = new System.Drawing.Point(146, 23);
            this.btnLink.Name = "btnLink";
            this.btnLink.Size = new System.Drawing.Size(97, 35);
            this.btnLink.TabIndex = 2;
            this.btnLink.Text = "事件关联";
            this.btnLink.UseVisualStyleBackColor = true;
            this.btnLink.Click += new System.EventHandler(this.btnLink_Click);
            // 
            // FormMain
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(847, 402);
            this.Controls.Add(this.btnLink);
            this.Controls.Add(this.btnSwitch1);
            this.Controls.Add(this.btnTest);
            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle;
            this.Name = "FormMain";
            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
            this.Text = "事件测试";
            this.ResumeLayout(false);

        }

        private void btnSwitch_Click(object sender, EventArgs e)
        {
            this.btnTest.Click -= new System.EventHandler(this.btnTest_Click);
        }

        private void btnLink_Click(object sender, EventArgs e)
        {
            this.btnTest.Click += new System.EventHandler(this.btnTest_Click);
        }

image.png

3.0 事件级联响应

看代码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WFDemo
{
    /// <summary>
    /// partial:部分的，限定类本身的组成部分，两个名字一样的partial会在编译的时候编译成一个类（FormMain.Designer.cs）
    /// 编译器会自己去完成。
    /// </summary>
    public partial class FormMain : Form
    {
        public FormMain()
        {
            InitializeComponent();

            //给三个按钮添加同一个事件响应方法
            this.btnAndy.Click += new System.EventHandler(this.btn_Tracher_Click);
            this.btnCarry.Click += new System.EventHandler(this.btn_Tracher_Click);
            this.btnCoco.Click += new System.EventHandler(this.btn_Tracher_Click);
        }


        //事件响应方法
        private void btnTest_Click(object sender, EventArgs e)
        {
            MessageBox.Show("你好！");
        }

        private void btnSwitch_Click(object sender, EventArgs e)
        {
            this.btnTest.Click -= new System.EventHandler(this.btnTest_Click);
        }

        private void btnLink_Click(object sender, EventArgs e)
        {
            this.btnTest.Click += new System.EventHandler(this.btnTest_Click);
        }

        //事件响应的公共方法(sender:表示事件源对象)
        private void btn_Tracher_Click(object sender, EventArgs e)
        {
            string context = ((Button)sender).Text;
            MessageBox.Show(context+"您好!");
        }
    }
}

        private void InitializeComponent()
        {
            this.btnTest = new System.Windows.Forms.Button();
            this.btnSwitch1 = new System.Windows.Forms.Button();
            this.btnLink = new System.Windows.Forms.Button();
            this.btnTestEvent = new System.Windows.Forms.Button();
            this.btnAndy = new System.Windows.Forms.Button();
            this.btnCarry = new System.Windows.Forms.Button();
            this.btnCoco = new System.Windows.Forms.Button();
            this.SuspendLayout();
            // 
            // btnTest
            // 
            this.btnTest.Location = new System.Drawing.Point(364, 175);
            this.btnTest.Name = "btnTest";
            this.btnTest.Size = new System.Drawing.Size(97, 35);
            this.btnTest.TabIndex = 0;
            this.btnTest.Text = "测试按钮的事件";
            this.btnTest.UseVisualStyleBackColor = true;
            this.btnTest.Click += new System.EventHandler(this.btnTest_Click);
            // 
            // btnSwitch1
            // 
            this.btnSwitch1.Location = new System.Drawing.Point(33, 23);
            this.btnSwitch1.Name = "btnSwitch1";
            this.btnSwitch1.Size = new System.Drawing.Size(97, 35);
            this.btnSwitch1.TabIndex = 1;
            this.btnSwitch1.Text = "事件断开";
            this.btnSwitch1.UseVisualStyleBackColor = true;
            this.btnSwitch1.Click += new System.EventHandler(this.btnSwitch_Click);
            // 
            // btnLink
            // 
            this.btnLink.Location = new System.Drawing.Point(136, 23);
            this.btnLink.Name = "btnLink";
            this.btnLink.Size = new System.Drawing.Size(97, 35);
            this.btnLink.TabIndex = 2;
            this.btnLink.Text = "事件关联";
            this.btnLink.UseVisualStyleBackColor = true;
            this.btnLink.Click += new System.EventHandler(this.btnLink_Click);
            // 
            // btnTestEvent
            // 
            this.btnTestEvent.Location = new System.Drawing.Point(239, 23);
            this.btnTestEvent.Name = "btnTestEvent";
            this.btnTestEvent.Size = new System.Drawing.Size(133, 35);
            this.btnTestEvent.TabIndex = 3;
            this.btnTestEvent.Text = "测试事件的级联响应";
            this.btnTestEvent.UseVisualStyleBackColor = true;
            // 
            // btnAndy
            // 
            this.btnAndy.Location = new System.Drawing.Point(378, 23);
            this.btnAndy.Name = "btnAndy";
            this.btnAndy.Size = new System.Drawing.Size(133, 35);
            this.btnAndy.TabIndex = 4;
            this.btnAndy.Text = "Andy老师";
            this.btnAndy.UseVisualStyleBackColor = true;
            // 
            // btnCarry
            // 
            this.btnCarry.Location = new System.Drawing.Point(517, 23);
            this.btnCarry.Name = "btnCarry";
            this.btnCarry.Size = new System.Drawing.Size(133, 35);
            this.btnCarry.TabIndex = 5;
            this.btnCarry.Text = "Carry老师";
            this.btnCarry.UseVisualStyleBackColor = true;
            // 
            // btnCoco
            // 
            this.btnCoco.Location = new System.Drawing.Point(656, 23);
            this.btnCoco.Name = "btnCoco";
            this.btnCoco.Size = new System.Drawing.Size(133, 35);
            this.btnCoco.TabIndex = 6;
            this.btnCoco.Text = "Coco老师";
            this.btnCoco.UseVisualStyleBackColor = true;
            // 
            // FormMain
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(847, 402);
            this.Controls.Add(this.btnCoco);
            this.Controls.Add(this.btnCarry);
            this.Controls.Add(this.btnAndy);
            this.Controls.Add(this.btnTestEvent);
            this.Controls.Add(this.btnLink);
            this.Controls.Add(this.btnSwitch1);
            this.Controls.Add(this.btnTest);
            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle;
            this.Name = "FormMain";
            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
            this.Text = "Coco老师";
            this.ResumeLayout(false);

        }

image.png

4.0 其他控件的常用事件。

image.png

END