1.OpenFileDialog

private void btnOpen_Click(object sender, EventArgs e){OpenFileDialog ofd = new OpenFileDialog();ofd.InitialDirectory = @"C:\Users\LWP1398\Desktop"; //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)|*.csvofd.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 + "\r\n" + "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:\Users\LWP1398\Desktop"; //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)|*.csvofd.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] + "\r\n";//输出一个路径回车换行}for (int i = 0; i < ofd.FileNames.Length; i++){txtPath.Text += ofd.SafeFileNames[i] + "\r\n";}}}

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 + "\r\n" ;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);