「C#」打开一个文件对话框并保存

           SaveFileDialog saveFileDialog1 = new SaveFileDialog();

            saveFileDialog1.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*";
            saveFileDialog1.FilterIndex = 2;
            saveFileDialog1.RestoreDirectory = true;
            //saveFileDialog1.FileName = "111";//设置默认文件名为111
            saveFileDialog1.InitialDirectory = System.Environment.CurrentDirectory.ToString();//设置默认目录为本程序目录

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

                    StreamWriter sw = new StreamWriter(saveFileDialog1.FileName, true);
                    sw.Write(textBox_result.Text);
                    sw.Close();


            }