將RichText Box的文本保存爲文本文件

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); 
     } 
    } 

這不起作用，每次打開文件時，計算機都會要求程序選擇既不選擇也不允許設置默認程序。什麼是缺少有，有人幫助:)

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); 
    } 
}