public TestOne()

 {

 InitializeComponent();

 SaveFileDialog();//调用打开SaveFileDialog 保存对话框

 } 

 #region 保存对话框

 private void SaveFileDialog()

 {

 //string localFilePath, fileNameExt, newFileName, FilePath;

 SaveFileDialog saveFileDialog1 = new SaveFileDialog(); 

 //设置文件类型

 saveFileDialog1.Filter = " txt files(*.txt)|*.txt|All files(*.*)|*.*"; 

 //设置默认文件类型显示顺序

 saveFileDialog1.FilterIndex = ; 

 //保存对话框是否记忆上次打开的目录

 saveFileDialog1.RestoreDirectory = true; 

 //点了保存按钮进入

 if (saveFileDialog1.ShowDialog() == DialogResult.OK)

 {

   //获得文件路径

   //localFilePath = saveFileDialog1.FileName.ToString(); 

   //获取文件名，不带路径

   //fileNameExt = localFilePath.Substring(localFilePath.LastIndexOf("\\") + 1); 

   //获取文件路径，不带文件名

   //FilePath = localFilePath.Substring(0, localFilePath.LastIndexOf("\\")); 

   //给文件名前加上时间

   //newFileName = DateTime.Now.ToString("yyyyMMdd") + fileNameExt; 

   //在文件名里加字符

   //saveFileDialog1.FileName.Insert(1,"dameng"); 

   System.IO.FileStream fs = (System.IO.FileStream)saveFileDialog1.OpenFile();//输出文件 

                       //fs输出带文字或图片的文件，就看需求了

 }

 }