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Form_CtnDetail deta = new Form_CtnDetail();
deta.MdiParent = this.MdiParent;
//deta.MdiParent.TopLevel = false;
//deta.TopLevel = true;
deta.TopMost = true;
deta.BringToFront();
deta.Show();
Form_CtnDetail deta = new Form_CtnDetail();
deta.ShowInTaskbar = false;
deta.ShowDialog();
Form_CtnDetail deta = new Form_CtnDetail();
deta.ShowInTaskBar=false;
deta.ShowDialog();
Form_CtnDetail deta = new Form_CtnDetail();
deta.MdiParent = this.MdiParent;
this.MdiParent.Enabled = false;
this.Enabled = false;
//deta.MdiParent.TopLevel = false;
//deta.TopLevel = true;
deta.TopMost = true;
deta.BringToFront();
deta.ShowDialog();
this.Enabled = true;
this.MdiParent.Enabled = true;
//未启用的窗体不能显示为模式对话框。在调用 showDialog 之前应将窗体的 Enabled 属性设置为 true。
//用ShowDialog报错
//非顶级窗体不能显示为模式对话框。在调用 showDialog 之前应从所有父窗体中移除该窗体。