start.cs

记事本的小程序

using System;
using System.IO;
using System.Drawing;
using System.Collections;
using System.Windows.Forms;
using System.Data;
using System.Text;

namespace notepad
{
	/// <summary>
	/// Summary description for Form1.
	/// </summary>
	public class Start : System.Windows.Forms.Form
	{
		private System.Windows.Forms.MenuItem menuAbout;
		private System.Windows.Forms.MenuItem menuFile;
		private System.Windows.Forms.MenuItem menuNew;
		private System.Windows.Forms.MenuItem menuOpen;
		private System.Windows.Forms.MenuItem menuSave;
		private System.Windows.Forms.MenuItem menuSaveas;
		private System.Windows.Forms.MenuItem menuItem1;
		private System.Windows.Forms.MenuItem menuExit;
		private System.Windows.Forms.TextBox showtext;
		private System.Windows.Forms.MainMenu StartMenu;
		private string file,apath,afilename;

		public Start(string path,string filename)
		{
			//
			// Required for Windows Form Designer support
			//

			InitializeComponent();

			//
			// TODO: Add any constructor code after InitializeComponent call
			//
			this.Text = filename;
			OpenFile(path,filename);
			file = showtext.Text;
			apath = path;
			afilename = filename;
		}
		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			base.Dispose( disposing );
		}

		static void Main() 
		{
			Application.Run(new Start("","untitled.txt"));
		}

		#region Windows Form Designer generated code
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{
			System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(Start));
			this.StartMenu = new System.Windows.Forms.MainMenu();
			this.menuAbout = new System.Windows.Forms.MenuItem();
			this.menuFile = new System.Windows.Forms.MenuItem();
			this.menuNew = new System.Windows.Forms.MenuItem();
			this.menuOpen = new System.Windows.Forms.MenuItem();
			this.menuSave = new System.Windows.Forms.MenuItem();
			this.menuSaveas = new System.Windows.Forms.MenuItem();
			this.menuItem1 = new System.Windows.Forms.MenuItem();
			this.menuExit = new System.Windows.Forms.MenuItem();
			this.showtext = new System.Windows.Forms.TextBox();
			// 
			// StartMenu
			// 
			this.StartMenu.MenuItems.Add(this.menuAbout);
			this.StartMenu.MenuItems.Add(this.menuFile);
			// 
			// menuAbout
			// 
			this.menuAbout.Text = "关于";
			this.menuAbout.Click += new System.EventHandler(this.menuAbout_Click);
			// 
			// menuFile
			// 
			this.menuFile.MenuItems.Add(this.menuNew);
			this.menuFile.MenuItems.Add(this.menuOpen);
			this.menuFile.MenuItems.Add(this.menuSave);
			this.menuFile.MenuItems.Add(this.menuSaveas);
			this.menuFile.MenuItems.Add(this.menuItem1);
			this.menuFile.MenuItems.Add(this.menuExit);
			this.menuFile.Text = "文件";
			// 
			// menuNew
			// 
			this.menuNew.Text = "新建";
			this.menuNew.Click += new System.EventHandler(this.menuNew_Click);
			// 
			// menuOpen
			// 
			this.menuOpen.Text = "打开";
			this.menuOpen.Click += new System.EventHandler(this.menuOpen_Click);
			// 
			// menuSave
			// 
			this.menuSave.Text = "保存";
			this.menuSave.Click += new System.EventHandler(this.menuSave_Click);
			// 
			// menuSaveas
			// 
			this.menuSaveas.Text = "另存为";
			this.menuSaveas.Click += new System.EventHandler(this.menuSaveas_Click);
			// 
			// menuItem1
			// 
			this.menuItem1.Text = "-";
			// 
			// menuExit
			// 
			this.menuExit.Text = "退出";
			this.menuExit.Click += new System.EventHandler(this.menuExit_Click);
			// 
			// showtext
			// 
			this.showtext.Font = new System.Drawing.Font("宋体", 9.75F, System.Drawing.FontStyle.Regular);
			this.showtext.Multiline = true;
			this.showtext.ScrollBars = System.Windows.Forms.ScrollBars.Both;
			this.showtext.Size = new System.Drawing.Size(176, 180);
			this.showtext.Text = "";
			// 
			// Start
			// 
			this.Controls.Add(this.showtext);
			this.Menu = this.StartMenu;

		}
		#endregion

		private void OpenFile(string path,string filename)
		{
			if(path!="")
			{
				showtext.Text = "";
				string input;
				using (StreamReader fs = new StreamReader(path+filename,System.Text.Encoding.Default,true)) 
				{
					while ((input=fs.ReadLine())!=null) 
						showtext.Text += input + "\r\n"; 
				}
			}
		}

		private void menuExit_Click(object sender, System.EventArgs e)
		{
			Application.Exit();
		}

		private void menuAbout_Click(object sender, System.EventArgs e)
		{
			About about = new About();
			about.ShowDialog();
		}

		private void menuOpen_Click(object sender, System.EventArgs e)
		{
			if(showtext.Text!=file)
			{
				if(MessageBox.Show("请注意您编辑的信息尚未保存，如果打开新文件将会丢失已修改内容！您真的要这样做吗？", this.Text,
					MessageBoxButtons.YesNo, MessageBoxIcon.Question,
					MessageBoxDefaultButton.Button2).ToString()=="Yes")
				{
					Treeview tree = new Treeview();
					tree.ShowDialog();
				}
			}
			else
			{
				Treeview tree = new Treeview();
				tree.ShowDialog();
			}
			
		}

		private void menuSave_Click(object sender, System.EventArgs e)
		{
			if(apath=="")
			{
				Saveas saveas = new Saveas(apath,afilename,showtext.Text);
				saveas.ShowDialog();
			}
			else
			{
				string filepath = apath+afilename;
				//写入文件
				using (StreamWriter fs = new StreamWriter(filepath,false,System.Text.Encoding.Default)) 
				{
					string[] content = System.Text.RegularExpressions.Regex.Split(showtext.Text,"\r\n");
					for(int i=0;i<content.Length;i++)
						fs.WriteLine(content[i]);
					fs.Close();
				}
			}
		}

		private void StartNew()
		{
			Start start = new Start("","untitled.txt");
			start.Show();
		}

		private void menuNew_Click(object sender, System.EventArgs e)
		{
			if(showtext.Text!=file)
			{
				if(MessageBox.Show("请注意您编辑的信息尚未保存，如果打开新文件将会丢失已修改内容！您真的要这样做吗？", this.Text,
					MessageBoxButtons.YesNo, MessageBoxIcon.Question,
					MessageBoxDefaultButton.Button2).ToString()=="Yes")
				{
					StartNew();
				}
			}
			else
				StartNew();
		}

		private void menuSaveas_Click(object sender, System.EventArgs e)
		{
			Saveas saveas = new Saveas(apath,afilename,showtext.Text);
			saveas.ShowDialog();
		}

	}
}