WPF文件的保存

private void ShowSaveFileDialog()
        {
            //string localFilePath, fileNameExt, newFileName, FilePath; 
            SaveFileDialog sfd = new SaveFileDialog();

            //设置文件类型 
            sfd.Filter = "数据库备份文件（*.bak）|*.bak|数据文件（*.mdf）|*.mdf|日志文件（*.ldf）|*.ldf";

            //设置默认文件类型显示顺序 
            sfd.FilterIndex = 1;

            //保存对话框是否记忆上次打开的目录 
            sfd.RestoreDirectory = true;

            //设置默认的文件名(本人测试没成功)
            sfd.FileName = "YourFileName";// in wpf is  sfd.FileName = "YourFileName";

            //点了保存按钮进入 
            if (sfd.ShowDialog() == DialogResult.OK)
            {
                string localFilePath = sfd.FileName.ToString(); //获得文件路径 
                string fileNameExt = localFilePath.Substring(localFilePath.LastIndexOf("\\") + 1); //获取文件名，不带路径
                string filePath = localFilePath.Substring(0, localFilePath.LastIndexOf("\\"));//获取文件路径，不带文件名
                                                                                              //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
            }
        }
｝