以下是该链接的摘录实际检查文本字段的更改并提示保存：

private void Form1_Closing(object sender,System.ComponentModel.CancelEventArgs e)
{
   // Determine if text has changed in the textBox by comparing to original text.
   if (textBox1.Text != strMyOriginalText)
   {
      // Display a MsgBox asking the user to save changes or abort.
      if(MessageBox.Show("Do you want to save changes to your text?","My Application",MessageBoxButtons.YesNo) ==  DialogResult.Yes)
      {
         // Cancel the Closing event from closing the form.
         e.Cancel = true;
         // Call method to save file...
      }
   }
}

您可以更改文本以满足您的需要,然后我认为您可能希望根据您的文本将DialogResult.Yes切换为DialogResult.No.

以下是一些适合您的修改代码：

private void Form1_Closing(object sender,System.ComponentModel.CancelEventArgs e)
{
   if(MessageBox.Show("Are you sure you want to quit?",MessageBoxButtons.YesNo) ==  DialogResult.No)
   {
      e.Cancel = true;
   }
}