C# SaveFileDialog与OpenFileDialog用法案例详解

  1.OpenFileDialog

  private void btnOpen_Click(object sender, EventArgs e)

  {

  OpenFileDialog ofd = new OpenFileDialog();

  ofd.InitialDirectory = @"C:UsersLWP1398Desktop"; //设置初始路径

  ofd.Filter = "Excel文件(*.xls)|*.xls|Csv文件(*.csv)|*.csv|所有文件(*.*)|*.*"; //设置“另存为文件类型”或“文件类型”框中出现的选择内容

  ofd.FilterIndex = 2; //设置默认显示文件类型为Csv文件(*.csv)|*.csv

  ofd.Title = "打开文件"; //获取或设置文件对话框标题

  ofd.RestoreDirectory = true;

  if (ofd.ShowDialog() == DialogResult.OK)

  {

  //FileName:所选文件的全路径 SafeFileName:所选的文件名

  txtPath.Text = "FileName:" + ofd.FileName + "

  " + "SafeFileName:" + ofd.SafeFileName;

  }

  }

  2.OpenFileDialog选择多个文件

  private void button3_Click(object sender, EventArgs e)

  {

  OpenFileDialog ofd = new OpenFileDialog();

  ofd.InitialDirectory = @"C:UsersLWP1398Desktop"; //设置初始路径

  ofd.Filter = "Excel文件(*.xls)|*.xls|Csv文件(*.csv)|*.csv|所有文件(*.*)|*.*"; //设置“另存为文件类型”或“文件类型”框中出现的选择内容

  ofd.FilterIndex = 2; //设置默认显示文件类型为Csv文件(*.csv)|*.csv

  ofd.Title = "打开文件"; //获取或设置文件对话框标题

  ofd.RestoreDirectory = true;设置对话框是否记忆上次打开的目录

  ofd.Multiselect = true;//设置多选

  if (ofd.ShowDialog() == DialogResult.OK)

  {

  for (int i = 0; i < ofd.FileNames.Length; i++)

  {

  txtPath.Text += ofd.FileNames[i] + "

  ";//输出一个路径回车换行

  }

  for (int i = 0; i < ofd.FileNames.Length; i++)

  {

  txtPath.Text += ofd.SafeFileNames[i] + "

  ";

  }

  }

  }

  3.SaveFileDialog

  private void button2_Click(object sender, EventArgs e)

  {

  SaveFileDialog sfd=new SaveFileDialog();

  sfd.Filter = "文本文件(*.txt)|*.txt|所有文件|*.*";//设置文件类型

  sfd.FileName = "保存";//设置默认文件名

  sfd.DefaultExt = "txt";//设置默认格式(可以不设)

  sfd.AddExtension = true;//设置自动在文件名中添加扩展名

  if (sfd.ShowDialog()==DialogResult.OK)

  {

  txtPath.Text = "FileName:" + sfd.FileName + "

  " ;

  using (StreamWriter sw = new StreamWriter(sfd.FileName))

  {

  sw.WriteLineAsync("今天是个好天气");

  }

  }

  MessageBox.Show("ok");

  }

  private void saveFileDialog1_FileOk(object sender, CancelEventArgs e)

  {

  saveFileDialog1.AddExtension = true; //自动添加扩展名

  e.Cancel = true; //取消保存操作

  string 扩展名 = System.IO.Path.GetExtension(saveFileDialog1.FileName);

  //判断扩展名并实现自定义的保存操作(导出)

  if (扩展名 == "txt")

  { }

  if (扩展名 == "xml")

  { }

  }

  4.FolderBrowserDialog

  string defaultPath = "";

  FolderBrowserDialog dialog = new FolderBrowserDialog();

  //打开的文件夹浏览对话框上的描述

  dialog.Description = "请选择一个文件夹";

  //是否显示对话框左下角 新建文件夹 按钮,默认为 true

  dialog.ShowNewFolderButton = false;

  //首次defaultPath为空,按FolderBrowserDialog默认设置(即桌面)选择

  if (defaultPath != "")

  {

  //设置此次默认目录为上一次选中目录

  dialog.SelectedPath = defaultPath;

  }

  //按下确定选择的按钮

  if (dialog.ShowDialog() == DialogResult.OK)

  {

  //记录选中的目录

  defaultPath = dialog.SelectedPath;

  }

  MessageBox.show(defaultPath);

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