学习实践：委托与事件的小例子

时间：2011-05-29 来源：握紧幸福

听说委托这个槛是比较难过的。。。所以在这方面读了很多相关文档，下面的这个小例子，就是这几天的学习成果。。。。

PS:只是给像我一样刚入门的朋友看的，大侠飘过。。。

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

namespace StudyDeleget
{
    public delegate void SaySomeThing (string name);   // 声明委托

    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();       

        }

        public void Hello(string name)    //方法一
        {
            txtWrite.Text += name + "Say Hello! \r\n";
        }

        public void NiceToSeeYou(string name)  //方法二
        {
            txtWrite.Text += name + "Say nice to see you ! \r\n";
        }

        public event SaySomeThing SomeBodySay;   //将要绑定委托的事件

        private void button1_Click(object sender, EventArgs e)
        {
            txtWrite.Text = "";
            string name = txtName.Text;

            SaySomeThing SayHello = new SaySomeThing(Hello);         //实例化委托
            SaySomeThing SayNice = new SaySomeThing(NiceToSeeYou);

            SomeBodySay += SayHello;   //向事件绑定委托方法
            SomeBodySay += SayNice;

            SomeBodySay -= SayNice;   

            SomeBodySay(name);  //触发事件
        }
    }
}

Designer.cs

namespace StudyDeleget
{
    partial class Form1
    {
        /// <summary>
        /// 必需的设计器变量。
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// 清理所有正在使用的资源。
        /// </summary>
        /// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows 窗体设计器生成的代码

        /// <summary>
        /// 设计器支持所需的方法 - 不要
        /// 使用代码编辑器修改此方法的内容。
        /// </summary>
        private void InitializeComponent()
        {
            this.txtWrite = new System.Windows.Forms.TextBox();
            this.btnSayChinese = new System.Windows.Forms.Button();
            this.txtName = new System.Windows.Forms.TextBox();
            this.SuspendLayout();
            // 
            // txtWrite
            // 
            this.txtWrite.Location = new System.Drawing.Point(163, 12);
            this.txtWrite.Multiline = true;
            this.txtWrite.Name = "txtWrite";
            this.txtWrite.Size = new System.Drawing.Size(419, 333);
            this.txtWrite.TabIndex = 0;
            // 
            // btnSayChinese
            // 
            this.btnSayChinese.Location = new System.Drawing.Point(12, 54);
            this.btnSayChinese.Name = "btnSayChinese";
            this.btnSayChinese.Size = new System.Drawing.Size(133, 23);
            this.btnSayChinese.TabIndex = 1;
            this.btnSayChinese.Text = "button1";
            this.btnSayChinese.UseVisualStyleBackColor = true;
            this.btnSayChinese.Click += new System.EventHandler(this.button1_Click);
            // 
            // txtName
            // 
            this.txtName.Location = new System.Drawing.Point(12, 12);
            this.txtName.Name = "txtName";
            this.txtName.Size = new System.Drawing.Size(133, 21);
            this.txtName.TabIndex = 2;
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(594, 357);
            this.Controls.Add(this.txtName);
            this.Controls.Add(this.btnSayChinese);
            this.Controls.Add(this.txtWrite);
            this.Name = "Form1";
            this.Text = "Form1";
            this.ResumeLayout(false);
            this.PerformLayout();

        }

        #endregion

        private System.Windows.Forms.TextBox txtWrite;
        private System.Windows.Forms.Button btnSayChinese;
        private System.Windows.Forms.TextBox txtName;
    }
}