WinForm 小程序 NotePad

 using System;

 using System.Collections.Generic;

 using System.ComponentModel;

 using System.Data;

 using System.Drawing;

 using System.Linq;

 using System.Text;

 using System.Threading.Tasks;

 using System.Windows.Forms;

 namespace FreeNotes

 {

     public partial class NotePad : Form

     {

         public NotePad()

         {

             InitializeComponent();

         }

         /// <summary>

         /// 打开文件事件

         /// </summary>

         private void btn_Open_Click(object sender, EventArgs e)

         {

             OpenFileDialog of = new OpenFileDialog();

             of.DefaultExt = "*.rtf";

             of.Filter = "rtf文件(*.rtf)|*.rtf|所有文件(*.*)|*.*";

             if (of.ShowDialog() == DialogResult.OK && of.FileName.Length > )

             {

                 richTextBox1.LoadFile(of.FileName, RichTextBoxStreamType.RichText);

             }

         }

         /// <summary>

         /// 保存文件事件

         /// </summary>

         private void btn_Save_Click(object sender, EventArgs e)

         {

             SaveFileDialog sa = new SaveFileDialog();

             sa.Title = "保存";

             sa.FileName = "*.rtf";

             sa.Filter = "rtf文件(*.rtf)|*.rtf|所有文件(*.*)|*.*";

             sa.DefaultExt = "*.rtf";

             if (sa.ShowDialog() == DialogResult.OK && sa.FileName.Length > )

             {

                 richTextBox1.SaveFile(sa.FileName, RichTextBoxStreamType.RichText);

             }

         }

         /// <summary>

         /// 字体事件

         /// </summary>

         private void btn_Font_Click(object sender, EventArgs e)

         {

             FontDialog fda = new FontDialog();

             fda.ShowColor = true;

             if (fda.ShowDialog() != DialogResult.Cancel)

             {

                 richTextBox1.SelectionFont = fda.Font;

                 richTextBox1.SelectionColor = fda.Color;

             }

         }

         /// <summary>

         /// 清空文本事件

         /// </summary>

         private void btn_Clear_Click(object sender, EventArgs e)

         {

             richTextBox1.Clear();

         }

     }

 }