Form1 form; /// <summary> /// 开始检测 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void button1_Click(object sender, EventArgs e) { if (form==null) //如果子窗体为空则创造实例 并显示 { form = new Form1(); form.StartPosition = FormStartPosition.CenterScreen;//子窗体居中显示 form.Show(); } else { if (form.IsDisposed) //若子窗体关闭 则打开新子窗体 并显示 { form = new Form1(); form.StartPosition = FormStartPosition.CenterScreen;//子窗体居中显示 form.Show(); } else { form.Activate(); //使子窗体获得焦点 } } }
Form1 form; /// <summary> /// 开始检测 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void button1_Click(object sender, EventArgs e) { if (form==null) //如果子窗体为空则创造实例 并显示 { form = new Form1(); form.StartPosition = FormStartPosition.CenterScreen;//子窗体居中显示 form.Show(); } else { if (form.IsDisposed) //若子窗体关闭 则打开新子窗体 并显示 { form = new Form1(); form.StartPosition = FormStartPosition.CenterScreen;//子窗体居中显示 form.Show(); } else { form.Activate(); //使子窗体获得焦点 } } }