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   源码介绍

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using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace Text
{
	/// <summary>
	/// Form1 的摘要说明。
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		private System.Windows.Forms.OpenFileDialog openFileDialog1;
		private System.Windows.Forms.RichTextBox richTextBox1;
		private System.Windows.Forms.Button button1;
		private System.Windows.Forms.Button button2;
		private System.Windows.Forms.Button button3;
		private System.Windows.Forms.Button button4;
		private System.Windows.Forms.ContextMenu contextMenu1;
		//存放剪贴板循环的内容
		private string[] MyClipBoardText=new string[]{"","","","","","","","","",""};
		private System.Windows.Forms.Button button5;
		/// <summary>
		/// 必需的设计器变量。
		/// </summary>
		private System.ComponentModel.Container components = null;

		public Form1()
		{
			//
			// Windows 窗体设计器支持所必需的
			//
			InitializeComponent();

			//
			// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
			//
		}

		/// <summary>
		/// 清理所有正在使用的资源。
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (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.openFileDialog1 = new System.Windows.Forms.OpenFileDialog();
			this.richTextBox1 = new System.Windows.Forms.RichTextBox();
			this.button1 = new System.Windows.Forms.Button();
			this.button2 = new System.Windows.Forms.Button();
			this.button3 = new System.Windows.Forms.Button();
			this.button4 = new System.Windows.Forms.Button();
			this.contextMenu1 = new System.Windows.Forms.ContextMenu();
			this.button5 = new System.Windows.Forms.Button();
			this.SuspendLayout();
			// 
			// openFileDialog1
			// 
			this.openFileDialog1.Filter = "所有文本文件(*.txt)|*.txt|所有文件(*.*)|*.*";
			// 
			// richTextBox1
			// 
			this.richTextBox1.Location = new System.Drawing.Point(8, 40);
			this.richTextBox1.Name = "richTextBox1";
			this.richTextBox1.Size = new System.Drawing.Size(320, 184);
			this.richTextBox1.TabIndex = 2;
			this.richTextBox1.Text = "";
			// 
			// button1
			// 
			this.button1.Location = new System.Drawing.Point(8, 8);
			this.button1.Name = "button1";
			this.button1.Size = new System.Drawing.Size(64, 23);
			this.button1.TabIndex = 3;
			this.button1.Text = "浏览文件";
			this.button1.Click  = new System.EventHandler(this.button1_Click);
			// 
			// button2
			// 
			this.button2.Location = new System.Drawing.Point(136, 8);
			this.button2.Name = "button2";
			this.button2.Size = new System.Drawing.Size(64, 23);
			this.button2.TabIndex = 4;
			this.button2.Text = "复制文本";
			this.button2.Click  = new System.EventHandler(this.button2_Click);
			// 
			// button3
			// 
			this.button3.ContextMenu = this.contextMenu1;
			this.button3.Location = new System.Drawing.Point(200, 8);
			this.button3.Name = "button3";
			this.button3.Size = new System.Drawing.Size(64, 23);
			this.button3.TabIndex = 5;
			this.button3.Text = "粘贴文本";
			this.button3.Click  = new System.EventHandler(this.button3_Click);
			// 
			// button4
			// 
			this.button4.Location = new System.Drawing.Point(264, 8);
			this.button4.Name = "button4";
			this.button4.Size = new System.Drawing.Size(64, 23);
			this.button4.TabIndex = 6;
			this.button4.Text = "关闭程序";
			this.button4.Click  = new System.EventHandler(this.button4_Click);
			// 
			// button5
			// 
			this.button5.Location = new System.Drawing.Point(72, 8);
			this.button5.Name = "button5";
			this.button5.Size = new System.Drawing.Size(64, 23);
			this.button5.TabIndex = 7;
			this.button5.Text = "剪切文本";
			this.button5.Click  = new System.EventHandler(this.button5_Click);
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.ClientSize = new System.Drawing.Size(336, 230);
			this.Controls.Add(this.button5);
			this.Controls.Add(this.button4);
			this.Controls.Add(this.button3);
			this.Controls.Add(this.button2);
			this.Controls.Add(this.button1);
			this.Controls.Add(this.richTextBox1);
			this.MaximizeBox = false;
			this.Name = "Form1";
			this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
			this.Text = "演示剪贴板循环";
			this.ResumeLayout(false);

		}
		#endregion

		/// <summary>
		/// 应用程序的主入口点。
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new Form1());
		}

		private void button1_Click(object sender, System.EventArgs e)
		{//浏览文件
			if(this.openFileDialog1.ShowDialog()==DialogResult.OK)
			{
				string MyFileName=this.openFileDialog1.FileName;
				string MyShortFileName=MyFileName.Substring(MyFileName.LastIndexOf("\\") 1);
				this.Text="演示剪贴板循环-" MyShortFileName;				
				this.richTextBox1.LoadFile(MyFileName,RichTextBoxStreamType.PlainText);
			}
		}
		private void button4_Click(object sender, System.EventArgs e)
		{//关闭程序
		   this.Close();
		}
		private void button2_Click(object sender, System.EventArgs e)
		{//复制文本
			string MySelectedText=this.richTextBox1.SelectedText;
			if(MySelectedText.Length<1)
			{
				MessageBox.Show("请首先选择文本！","信息提示",MessageBoxButtons.OK,MessageBoxIcon.Information);
				return;
			}
			//复制文本到系统剪贴板
			Clipboard.SetDataObject(MySelectedText);
			if(this.contextMenu1!=null)
			{  
				//取得菜单项数量
				int i=this.contextMenu1.MenuItems.Count;
				//粘贴文本限于十个菜单
				if(i<10)
				{
					//添加新菜单项
					MenuItem NewItem=new MenuItem("粘贴文本：" MySelectedText);
					if(MySelectedText.Length>10)
					{
						NewItem.Text="粘贴文本：" MySelectedText.Substring(0,10) "...";
					}
					//处理菜单单击事件
					NewItem.Click =new EventHandler(MyMenuItemClickEvent);
					this.contextMenu1.MenuItems.Add(NewItem);
					this.MyClipBoardText[i]=MySelectedText;
				}
				else
				{//如果菜单数大于10，则清空第一个菜单，其余的向后递推
					string TempText=this.MyClipBoardText[0];
					MenuItem NewItem=new MenuItem("粘贴文本：" MySelectedText);
					if(MySelectedText.Length>10)
					{
						NewItem.Text="粘贴文本：" MySelectedText.Substring(0,10) "...";
					}
					//处理菜单单击事件
					NewItem.Click =new EventHandler(MyMenuItemClickEvent);
					//递推原来命令0-9项菜单项成为新命令的2-10项
					this.MyClipBoardText[0]=MySelectedText;
					for(int j=0;j<9;j  )
					{
						string NewText=this.MyClipBoardText[j 1];
						this.MyClipBoardText[j 1]=TempText;
						this.contextMenu1.MenuItems[j 1].Text="粘贴文本：" TempText;
						TempText=NewText;
					}
				}
			}
			else
			{
				//添加新菜单项
				MenuItem NewItem=new MenuItem("粘贴文本：" MySelectedText);
				if(MySelectedText.Length>10)
				{
					NewItem.Text="粘贴文本：" MySelectedText.Substring(0,10) "...";
				}
				//处理菜单单击事件
				NewItem.Click =new EventHandler(MyMenuItemClickEvent);
				this.contextMenu1.MenuItems.Add(NewItem);
				this.contextMenu1.MenuItems[0].Text="粘贴文本：" MySelectedText;
				this.MyClipBoardText[0]=MySelectedText;
			}		
		}

		private void button5_Click(object sender, System.EventArgs e)
		{//剪切文本
			this.button2_Click(null,null);
			this.richTextBox1.SelectedText="";
		}

		private void button3_Click(object sender, System.EventArgs e)
		{//粘贴文本，加载剪贴板循环菜单
			try
			{
				IDataObject MyData=Clipboard.GetDataObject();
				if(MyData!=null&&this.contextMenu1.MenuItems.Count==0)
				{
					if(MessageBox.Show("剪贴板中的数据不是本程序复制的数据，是否粘贴？","信息提示",MessageBoxButtons.YesNo,MessageBoxIcon.Question)==DialogResult.Yes)
					{
						this.richTextBox1.Paste();
					}
					else
			           return;
				}
			}
			catch(Exception Err)
			{//读取剪贴板出错
				MessageBox.Show("错误信息是：" Err.Message,"信息提示",MessageBoxButtons.OK,MessageBoxIcon.Error);
			}
			this.contextMenu1.Show(this.button3,new Point(0,20));
		}
		private void MyMenuItemClickEvent(object sender,System.EventArgs e)
		{//根据选择粘贴菜单粘贴文本
			//获取发出消息的命令
			MenuItem MyItem=(MenuItem)sender;
			//获得命令索引
			int i=MyItem.Index;
			//设置剪贴板数据
			Clipboard.SetDataObject(this.MyClipBoardText[i]);
			//粘贴到文本文档中
			this.richTextBox1.Paste();
		}
	}
}