将RichText Box的文本保存为文本文件

Question

private void saveToolStripMenuItem_Click(object sender, EventArgs e) 
    { 
     SaveFileDialog save_file = new SaveFileDialog(); 
     if (save_file.ShowDialog() == DialogResult.OK&&save_file.FileName.Length>0) 
     { 

      save_file.DefaultExt = "txt"; 
      WriteBox.SaveFile(save_file.FileName,RichTextBoxStreamType.PlainText); 
     } 
    } 

这不起作用，每次打开文件时，计算机都会要求程序选择既不选择也不允许设置默认程序。什么是缺少有，有人帮助:)

Answer 1

使用以下命令：

private void saveToolStripMenuItem_Click(object sender, EventArgs e) 
{ 
    SaveFileDialog save_file = new SaveFileDialog(); 
    save_file.DefaultExt = "txt"; 
    save_file.Filter = "Text files (*.txt)|*.txt|All files (*.*)|*.*"; 

    if (save_file.ShowDialog() == DialogResult.OK&&save_file.FileName.Length>0) 
    { 
     WriteBox.SaveFile(save_file.FileName,RichTextBoxStreamType.PlainText); 
    } 
}