Question

C#窗体中当用户点击对话框的“取消”按钮时，完成取消关闭窗体操作的代码

Answer 1

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
DialogResult dr = MessageBox.Show("是否退出？", "退出确认", MessageBoxButtons.OKCancel);
if (dr==DialogResult.Cancel) { e.Cancel = true; }
}

Answer 2

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
MessageBox.Show("提示？", "是否确认退出？",MessageBoxButtons.OKCancel,MessageBoxicon.information)

}
其实不用判断.点击窗口右上角的X,会弹出对话框，如果选择是OK的话，会关闭窗口，点取消相当与什么都没做

Answer 3

this.Dispose(); //释放资源
this.Close(); //关闭程序（窗口）

Answer 4

取消按钮是自己设计的话,直接把form 的cancel result button设置成这个button;
或者在点击button的时候this.dialogresult=cancel;

Answer 5

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
if (MessageBox.Show("确定关闭窗口?", "", MessageBoxButtons.OKCancel) == DialogResult.Cancel)
{
e.Cancel = true;
}
}