private static void CallBackCloseAlertForm(IAsyncResult ar)
{
//从C#异步调用状态ar.AsyncState中，获取委托对象
CloseAlertFormdelegate dn = (CloseAlertFormdelegate)ar.AsyncState;
//一定要EndInvoke，否则你的下场很惨
dn.EndInvoke(ar);
}
/// <summary>
/// 关闭AlertForm
/// </summary>
/// <param name="frm"></param>
public static void CloseAllAlertForm(Form frm)
{
if (frm.InvokeRequired)
{
CloseAlertFormdelegate outdelegate = new CloseAlertFormdelegate(CloseAllAlertForm);
AsyncCallback acb = new AsyncCallback(CallBackCloseAlertForm);
IAsyncResult iar = outdelegate.BeginInvoke(frm, acb, outdelegate);
}
else
{
frm.Close();
}
}