private void button6_Click(object sender, EventArgs e) { Form f = Application.OpenForms["Dakaixiangmu"]; //查找是否打开过Form1窗体 if (f == null) //没打开过 { Dakaixiangmu dakaixiangmu = new Dakaixiangmu(); dakaixiangmu.MdiParent = this.MdiParent; dakaixiangmu.Show(); } else { f.Focus(); //打开过就让其获得焦点 } }
private void button6_Click(object sender, EventArgs e) { Form f = Application.OpenForms["Dakaixiangmu"]; //查找是否打开过Form1窗体 if (f == null) //没打开过 { Dakaixiangmu dakaixiangmu= new Dakaixiangmu(); dakaixiangmu.MdiParent = this.MdiParent; dakaixiangmu.Show(); } else { f.Focus(); //打开过就让其获得焦点 } }