C# 自定义按钮及其事件处理

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

namespace study.NewFolder1.Right.Basic
{
    public delegate void MyEventHandler(object sender, string e);

    public partial class Title : UserControl
    {
        public Title()
        {
            InitializeComponent();
        }

        public Title(string str)
        {
            InitializeComponent();
            bar.Text = str;
        }

        public bool show = true; 
        public event MyEventHandler Changed;    // 这里也可以用自带的EventHandler

        private void Title_Click(object sender, EventArgs e)
        {
            if (show)
            {
                this.pictureBox1.Image = global::study.Properties.Resources._1073328;
                show = false;
            }
            else
            {
                this.pictureBox1.Image = global::study.Properties.Resources._1073317;
                show = true;
            }
            Changed(show, this.bar.Text);
        }

        #region 组件设计器生成的代码
        /// 
 
        /// 必需的设计器变量。
        /// 
        private System.ComponentModel.IContainer components = null;

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

        /// 
 
        /// 设计器支持所需的方法 - 不要修改
        /// 使用代码编辑器修改此方法的内容。
        /// 
        private void InitializeComponent()
        {
            this.bar = new System.Windows.Forms.Label();
            this.pictureBox1 = new System.Windows.Forms.PictureBox();
            ((System.ComponentModel.ISupportInitialize)(this.pictureBox1)).BeginInit();
            this.SuspendLayout();
            // 
            // bar
            // 
            this.bar.AutoSize = true;
            this.bar.Font = new System.Drawing.Font("宋体", 10.8F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
            this.bar.Location = new System.Drawing.Point(22, 10);
            this.bar.Name = "bar";
            this.bar.Size = new System.Drawing.Size(47, 19);
            this.bar.TabIndex = 0;
            this.bar.Text = "标题";
            this.bar.Click += new System.EventHandler(this.Title_Click);
            // 
            // pictureBox1
            // 
            this.pictureBox1.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
            this.pictureBox1.Image = global::study.Properties.Resources._1073328;
            this.pictureBox1.InitialImage = null;
            this.pictureBox1.Location = new System.Drawing.Point(610, 6);
            this.pictureBox1.Name = "pictureBox1";
            this.pictureBox1.Size = new System.Drawing.Size(30, 27);
            this.pictureBox1.TabIndex = 1;
            this.pictureBox1.TabStop = false;
            this.pictureBox1.Click += new System.EventHandler(this.Title_Click);
            // 
            // Title
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(8F, 15F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.BackColor = System.Drawing.SystemColors.ControlDark;
            this.Controls.Add(this.pictureBox1);
            this.Controls.Add(this.bar);
            this.Name = "Title";
            this.Size = new System.Drawing.Size(653, 40);
            this.Click += new System.EventHandler(this.Title_Click);
            ((System.ComponentModel.ISupportInitialize)(this.pictureBox1)).EndInit();
            this.ResumeLayout(false);
            this.PerformLayout();

        }

        #endregion

        private System.Windows.Forms.Label bar;
        private System.Windows.Forms.PictureBox pictureBox1;
    }
}