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private void MainForm_FormClosing(object sender, FormClosingEventArgs e)
{
if (e.CloseReason == CloseReason.UserClosing)
{
e.Cancel = true;
}
}
e.CloseReason还有其它关闭的情况的,你根据你的情况选择哪种情况不关闭,就把e.Cancel设为true就会不关闭的了!