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frmB B = new frmB();
B.MdiParent = this.MdiParent;
B.FormClosed += (sender, e) =>
{
frmB fb = (frmB)sender;
// 访问 fb 的字段属性方法
MessageBox.Show("B窗口已关闭!");
};
B.Show();
frmB B = new frmB();
B.MdiParent = this.MdiParent;
B.Show();
while (!f.IsDisposed)
{
Application.DoEvents();
}
MessageBox.Show("B窗口已关闭!");