OpenFileDialog

using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.IO; namespace WindowsApplication1 {     public partial class Form1 : Form     {         public Form1()         {             InitializeComponent();         }         private void button1_Click(object sender, EventArgs e)         {             OpenFileDialog openFiledDialog=new OpenFileDialog();             openFiledDialog.InitialDirectory = "D:\\";             openFiledDialog.Filter = "文本文件|*.*|C#文件|*.cs|所有文件|*.*";             openFiledDialog.FilterIndex= 1;             if (openFiledDialog.ShowDialog() == DialogResult.OK)             {             //打开文件对话框中选择的文件名                 string fname = openFiledDialog.FileName;                 //创建从字符串进行读取的StringReader对象                 StreamReader sr = File.OpenText(fname);                 string str;                 while((str=sr.ReadLine())!=null)                 {                 //将读出的字符串在richTextBox1中显示;                     this.richTextBox1.Text+=str;                 } private void button2_Click(object sender, EventArgs e)         {             SaveFileDialog saveFileDialog=new SaveFileDialog();             saveFileDialog.Filter = "文本文件|*.*|C#文件|*.cs|所有文件|*.*";             saveFileDialog.FilterIndex = 2;             saveFileDialog.RestoreDirectory = true;             if (saveFileDialog.ShowDialog() == DialogResult.OK)             {                 string fName = saveFileDialog.FileName;                 //向指定路径（fName）的文件中追加内容；                 StreamWriter sw = File.AppendText(fName);                 //将richTextBox1控件中的内容写入到指定文件中；                 sw.Write(this.richTextBox1.Text);                 sw.Write("添加到文件中的内容：添加的内容信息！");                 sw.Flush();                 sw.Close();             } private void button3_Click(object sender, EventArgs e)         {             FontDialog fontDialog = new FontDialog();             fontDialog.Color = richTextBox1.ForeColor;             //指示用户能否更改＂脚本＂组合框中的字符集             fontDialog.AllowScriptChange = true;             //该值指示对话框是否显示颜色选择；             fontDialog.ShowColor = true;             if (fontDialog.ShowDialog() != DialogResult.Cancel)             {                 richTextBox1.SelectionFont = fontDialog.Font;             } private void button4_Click(object sender, EventArgs e)         {             ColorDialog colorDialog = new ColorDialog();             colorDialog.AllowFullOpen = true;             colorDialog.FullOpen = true;             colorDialog.ShowHelp = true;             colorDialog.Color = Color.Black;             //初始化当然前文本框中的颜色             colorDialog.ShowDialog();             richTextBox1.SelectionColor = colorDialog.Color;         }         private void button5_Click(object sender, EventArgs e)         {             PageSetupDialog pageSetupDialog = new PageSetupDialog();             pageSetupDialog.Document =printDocument1 ;             pageSetupDialog.ShowDialog();         }             }         }     } }