form1.cs

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		#region 编辑菜单
		//实现动态控制菜单
		private void menuItemEdit_popup(object sender, System.EventArgs e)
		{
			//根据剪贴板上是否有TEXT的类型数据，决定menuItemPaste是否可用
			if (Clipboard.GetDataObject().GetDataPresent(DataFormats.Text))
			{
				menuItemPaste.Enabled = true;
			}
			else
			{
				menuItemPaste.Enabled = false;
			}

			//决定menuItemCut,menuItemCopy,menuItemDel是否可用
			if (textBoxEdit.SelectedText.Length > 0)
			{
				menuItemCopy.Enabled= true;
				menuItemCut.Enabled = true;
				menuItemDel.Enabled = true;
			}
			else
			{
				menuItemCopy.Enabled= false;
				menuItemCut.Enabled = false;
				menuItemDel.Enabled = false;
			}

			//决定menuItemUndo是否可用
			if (textBoxEdit.CanUndo ==true)
			{
				menuItemUndo.Enabled = true;
			}
			else
			{
				menuItemUndo.Enabled = false;
			}
		}
		//撤消
		private void menuItemUndo_Click(object sender, System.EventArgs e)
		{
			if (textBoxEdit.CanUndo == true)
			{
				textBoxEdit.Undo();

				textBoxEdit.ClearUndo();
			}
		
		}

		//剪切
		private void menuItemCut_Click(object sender, System.EventArgs e)
		{
			if (textBoxEdit.SelectedText != "")
			{
				textBoxEdit.Cut();
			}
		
		}
		
		//复制
		private void menuItemCopy_Click(object sender, System.EventArgs e)
		{
			textBoxEdit.Copy();
		
		}

		//粘贴
		private void menuItemPaste_Click(object sender, System.EventArgs e)
		{
			if (Clipboard.GetDataObject().GetDataPresent(DataFormats.Text) ==true)
			{
				if (textBoxEdit.SelectionLength > 0)
				{
					DialogResult result;
					result = MessageBox.Show("你想覆盖掉选择的文本吗？","覆盖确认",MessageBoxButtons.YesNo);

					if(result ==DialogResult.No)
					{
						textBoxEdit.SelectionStart = textBoxEdit.SelectionStart + textBoxEdit.SelectionLength;
					}
				}
				textBoxEdit.Paste();
			}
		
		}

		//删除
		private void menuItemDel_Click(object sender, System.EventArgs e)
		{
			if (textBoxEdit.SelectedText != "")
			{
				textBoxEdit.SelectedText = "";
			}

		}

		//全选
		private void menuItemAll_Click(object sender, System.EventArgs e)
		{
			textBoxEdit.SelectAll();
		
		}
		#endregion

		#region 文件菜单
		//新建菜单
		private void menuItemNew_Click(object sender, System.EventArgs e)
		{
			if (needToSave == true)
			{
				DialogResult result = MessageBox.Show("文本文件内容已经改变，需要保存吗？"
					,"保存文件",MessageBoxButtons.YesNoCancel,
					MessageBoxIcon.Question);
				switch (result)
				{
					case DialogResult.Yes:
					{
						menuItemSave_Click(sender,e);
						textBoxEdit.Clear();
						this.Text = "文本编辑--新建文本";
						needToSave = false;
						break;
					}
					case DialogResult.No:
					{
						textBoxEdit.Clear();
						this.Text = "文本编辑--新建文本";
						needToSave = false;
						break;
					}
					case DialogResult.Cancel:
					{
						break;
					}
				}
			}
			else
			{
				textBoxEdit.Clear();
				this.Text ="文本编辑--新建文本";
			}
		}

		//打开
		private void menuItemoOpen_Click(object sender, System.EventArgs e)
		{
			if (needToSave == true)
			{
				DialogResult result = MessageBox.Show("文本内容已经改变，需要保存吗？","保存文件",
					MessageBoxButtons.YesNoCancel,MessageBoxIcon.Question);
				if (result == DialogResult.Cancel)
				{
					return;
				}
				if (result == DialogResult.Yes)
				{
					menuItemSave_Click (sender,e);
					needToSave = false;
				}
				string file = GetOpenFile();

				if(file == null)
				{
					return;
				}

				else
				{
					currentFileName = file;
					OpenFile();
					needToSave = false;
				}
			}
		}

		//打开指定文件
		private void OpenFile()
		{
			try
			{
				FileInfo f = new FileInfo(currentFileName);
				StreamReader reader = f.OpenText();
				textBoxEdit.Text = reader.ReadToEnd();
				reader.Close();
				this.Text = "文本编辑--" + f.Name;
			}
			catch(Exception e)
			{
				MessageBox.Show(e.Message);
			}
		}

		//获取要打开的文件名
		private string GetOpenFile ()
		{
			OpenFileDialog openFile = new OpenFileDialog();
			openFile.Title = "打开文本文件";
			openFile.CheckFileExists = true;
			openFile.CheckPathExists = true;
			openFile.AddExtension = true;
			openFile.Multiselect = false;
			openFile.Filter = "文本文件(*.txt)|*.txt|所有文件(*.*)|*.*";

			if (openFile.ShowDialog() == DialogResult.OK)
			{
				return openFile.FileName;
			}
			else
			{
				return null;
			}
		}

		//保存文件
		private void menuItemSave_Click(object sender, System.EventArgs e)
		{
			if(currentFileName == null)
			{
				menuItemSaveAs_Click (sender,e);
			}
			else
			{
				SaveFile(textBoxEdit.Text);
			}
			needToSave = false;
		}

		//另存为
		private void menuItemSaveAs_Click(object sender, System.EventArgs e)
		{
			string file = GetSaveFile();
		
			if(file == null)
			{
				return;
			}
			else
			{
				currentFileName = file;
				SaveFile(textBoxEdit.Text);
				FileInfo f = new FileInfo(currentFileName);
				this.Text = "文本编辑--" + f.Name;
				needToSave = false;
			}
		}
		
		//保存文件
		private void SaveFile (string str)
		{
			try
			{
				StreamWriter writer = new StreamWriter(currentFileName);
				writer.Write(str);
				writer.Close();
			}
			catch(Exception e)
			{
				MessageBox.Show(e.Message);
			}
		}

		//获得保存的文件名
		private string GetSaveFile()
		{
			SaveFileDialog saveFile = new SaveFileDialog();
			saveFile.Title = "保存文本文件";
			saveFile.OverwritePrompt = true;
			saveFile.CreatePrompt = true;
			saveFile.AddExtension = true;
			saveFile.Filter = "文本文件(*.txt)|*.txt|所有文件(*.*)|(*.*)";

			if(saveFile.ShowDialog() == DialogResult.OK)
			{
				return saveFile.FileName;
			}
			else 
			{
				return null;
			}
	}

		//退出
		private void menuItemExit_Click(object sender, System.EventArgs e)
		{
			//关闭窗口
			DialogResult diaRes;

			if (textBoxEdit.Text == "")
			{
				this.Close();
				return;
			}
			MessageBoxButtons buttons = MessageBoxButtons.YesNo;
			MessageBoxDefaultButton defaultButton = MessageBoxDefaultButton.Button1;
			MessageBoxIcon icon = MessageBoxIcon.Question;
			MessageBoxOptions options = MessageBoxOptions.RightAlign;
			string ask = "将要退出程序，是否继续";
			string caption = "退出程序";
			diaRes = MessageBox.Show(this,ask,caption,buttons,icon,defaultButton,options);
			if(diaRes == DialogResult.Yes)
			{
				this.Close();
			}
		}

	

		//打印清单
		private void printDocument_PrintPage(object sender,System.Drawing.Printing.PrintPageEventArgs e)
		{
			float linesPerPage = 0;
			float yPos = 0;
			int count = 0;
			float leftMargin = e.MarginBounds.Left;
			float topMargin = e.MarginBounds.Top;
			string line = null;
			StreamReader streamToPrint = new StreamReader(currentFileName);
			SolidBrush brush = new SolidBrush(textBoxEdit.ForeColor);
			linesPerPage = e.MarginBounds.Height / textBoxEdit.Font.GetHeight(e.Graphics);
			
			while (count < linesPerPage && ((line =streamToPrint.ReadLine()) != null))
			{
				yPos = topMargin + (count * textBoxEdit.Font.GetHeight(e.Graphics));
				e.Graphics.DrawString(line,textBoxEdit.Font,brush,leftMargin,yPos, new StringFormat());
				count++;
			}

			if (line != null)
			{
				e.HasMorePages = true;
			}
			else
			{
				e.HasMorePages = false;
			}
		}

		//打印
		private void menuItemprint_Click(object sender, System.EventArgs e)
		{
			PrintDialog printDialog = new PrintDialog();
			printDialog.Document = printDocument;

			if (printDialog.ShowDialog() == DialogResult.OK)
			{
				try
				{
					printDocument.Print();
				}
				catch (Exception ex)
				{
					MessageBox.Show(ex.Message);
				}
			}
		}

		//页面设置
		private void menuItemPageSet_Click(object sender, System.EventArgs e)
		{
			PageSetupDialog pageSet = new PageSetupDialog();
			pageSet.Document = printDocument;
			pageSet.ShowDialog();
		}
		#endregion

		#region 格式菜单
		//改变字体
		private void menuItemFont_Click(object sender, System.EventArgs e)
		{
			FontDialog fontDialog = new FontDialog();
			fontDialog.ShowColor = true;
			fontDialog.AllowScriptChange = true;
			fontDialog.AllowVectorFonts = true;
			fontDialog.ShowEffects = true;

			if (fontDialog.ShowDialog() == DialogResult.OK)
			{
				textBoxEdit.Font = fontDialog.Font;
				textBoxEdit.ForeColor = fontDialog.Color;
			}

		}

		//改变背景颜色
		private void menuItemColor_Click(object sender, System.EventArgs e)
		{
			ColorDialog colorDialog = new ColorDialog();
			colorDialog.AllowFullOpen = true;
			colorDialog.AnyColor = true;
			colorDialog.FullOpen = true;

			if (colorDialog.ShowDialog() == DialogResult.OK)
			{
				textBoxEdit.BackColor = colorDialog.Color;
			}
		}
		#endregion

		// 关于
		private void menuItemAbout_Click(object sender, System.EventArgs e)
		{
			AboutForm aboutForm = new AboutForm();
			aboutForm.ShowDialog();
		}

	}
}