C#读写文件、遍历文件、打开保存文件，窗体程序

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 FileReadWriteDemo {     public partial class Form1 : Form     {         public Form1()         {             InitializeComponent();         }         //遍历文件 - 浏览按钮         private void buttonBrowse_Click(object sender, EventArgs e)         {             OpenFileDialog ofd = new OpenFileDialog();             ofd.Filter = "(*.*)|*.*";                //过滤文件类型             ofd.RestoreDirectory = true; //记忆上次浏览路径             if(ofd.ShowDialog() == DialogResult.OK)             {                 DirectoryInfo dir = Directory.GetParent(ofd.FileName);   //获取文件所在的父目录                 textBox1.Text = dir.ToString()+"\\";             }         }         //遍历文件 - 遍历按钮         private void buttonTransform_Click(object sender, EventArgs e)         {             listBox1.Items.Clear();             TransformFiles(textBox1.Text.Trim());         }         public void TransformFiles(string path)         {             try             {                 DirectoryInfo dir = new DirectoryInfo(path);                 DirectoryInfo[] dirs = dir.GetDirectories();  //获取子目录                 FileInfo[] files = dir.GetFiles("*.*");  //获取文件名                 foreach (DirectoryInfo d in dirs)                 {                     TransformFiles(dir+d.ToString()+"\\"); //递归调用                 }                 foreach(FileInfo f in files)                 {                     listBox1.Items.Add(dir+f.ToString());                 }             }             catch (Exception ex)             {                 MessageBox.Show(ex.Message.ToString());             }                    }         //打开保存 - 打开按钮         private void buttonOpen_Click(object sender, EventArgs e)         {             textBox3.Text = "";             OpenFileDialog ofd = new OpenFileDialog();             ofd.Filter = "(*.txt)|*.txt|(*.*)|*.*";             ofd.RestoreDirectory = true;             if(ofd.ShowDialog() == DialogResult.OK)             {                                textBox2.Text = ofd.FileName;                 FileStream fs = new FileStream(ofd.FileName, FileMode.Open, FileAccess.Read);                 StreamReader sr = new StreamReader(fs);                 try                 {                     ofd.OpenFile(); //打开文件                     string line = sr.ReadLine(); //读取文本行                     while (line != null)                     {                         textBox3.Text += line + "\n";  //换行后继续读取直至line==null                         line = sr.ReadLine();                     }                 }                 catch (Exception ex)                 {                     MessageBox.Show(ex.Message.ToString());                 }                 finally                 {                     sr.Close();                     fs.Close();                 }             }         }         //打开保存 - 保存按钮         private void buttonSave_Click(object sender, EventArgs e)         {             SaveFileDialog sfd = new SaveFileDialog();             sfd.Filter = "(*.txt)|*.txt|(*.*)|*.*";             sfd.AddExtension = true;             sfd.RestoreDirectory = true;             if(sfd.ShowDialog() == DialogResult.OK)             {                 textBox2.Text = sfd.FileName;                 FileStream fs = new FileStream(sfd.FileName,FileMode.Create);                 StreamWriter sw = new StreamWriter(fs);                 try                 {                     sw.Write(textBox3.Text);                     sw.Flush();                 }                 catch(Exception ex)                 {                     MessageBox.Show(ex.Message.ToString());                 }                 finally                 {                     sw.Close();                     fs.Close();                 }             }         }         //读写文本 - 写入数据按钮         private void buttonWrite_Click(object sender, EventArgs e)         {             if (!(Directory.Exists(@"D:\temp")))             {                 Directory.CreateDirectory(@"D:\temp");             }             string filePath = @"D:\temp\qq.doc";             if(File.Exists(filePath))             {                 labelResult.ForeColor = Color.Red;                 labelResult.Text = "当前文件已经存在！";                 return;             }             FileStream fs = new FileStream(filePath,FileMode.Create);             StreamWriter sw = new StreamWriter(fs);             try             {                 sw.Write(textBox4.Text);                 sw.Flush();                 labelResult.ForeColor = Color.Green;                 labelResult.Text = "写入数据完成！";             }             catch (Exception ex)             {                 MessageBox.Show(ex.Message.ToString());             }             finally             {                 sw.Close();                 fs.Close();             }         }         //读写文本 - 读取数据按钮         private void buttonRead_Click(object sender, EventArgs e)         {             textBox5.Text = "";             string filePath = @"D:\temp\qq.doc";             if(!(File.Exists(filePath)))             {                 labelResult.ForeColor = Color.Red;                 labelResult.Text = filePath+"文件不存在！";                 return;             }             FileStream fs = new FileStream (filePath,FileMode.Open,FileAccess.Read);             StreamReader sr = new StreamReader(fs);             try             {                 string line = sr.ReadLine();                 while(line != null)                 {                     textBox5.Text += line + "\n";                     line = sr.ReadLine();                 }                 labelResult.ForeColor = Color.Green;                 labelResult.Text = "读取数据成功！";             }             catch(Exception ex)             {                 MessageBox.Show(ex.Message.ToString());             }             finally             {                 sr.Close();                 fs.Close();             }         }         //读写二进制文件 - 写入数据按钮         private void buttonWrite2_Click(object sender, EventArgs e)         {             string filePath = @"D:\temp\test.data";             if (!(Directory.Exists(@"D:\temp")))             {                 Directory.CreateDirectory(@"D:\temp");             }                        if(File.Exists(filePath))             {                 labelResult2.ForeColor = Color.Red;                 labelResult2.Text = "文件已经存在！";                 return;             }             FileStream fs = new FileStream(filePath,FileMode.Create);             BinaryWriter bw = new BinaryWriter(fs);             for (int i = 0; i < 200; i++)             {                 bw.Write((int)i);             }             bw.Flush();             labelResult2.ForeColor = Color.Green;             labelResult2.Text = "写入数据成功！";             bw.Close();             fs.Close();         }         //读写二进制文件 - 读取数据按钮         private void buttonRead2_Click(object sender, EventArgs e)         {             textBox6.Text = "";             string filePath = @"D:\temp\test.data";             if(!(File.Exists(filePath)))             {                 labelResult2.ForeColor = Color.Red;                 labelResult2.Text = filePath+"文件不存在！";                 return;             }             FileStream fs = new FileStream(filePath,FileMode.Open,FileAccess.Read);             BinaryReader br = new BinaryReader(fs);             for (int i = 0; i < 200; i++)             {                 Int32 intTmp = br.ReadInt32();                 textBox6.Text += "->" + intTmp.ToString();             }             labelResult2.ForeColor = Color.Green;             labelResult2.Text = "读取数据成功！";             br.Close();             fs.Close();         }     } }