符合条件的子窗体自动关闭

Question

父窗体Form1：
        private void button2_Click(object sender, EventArgs e)
        {
            
            Form2 v = new Form2();
            v.ShowDialog();
            this.Hide();
            if (v.ShowDialog() == DialogResult.OK)
            {
                this.Show();
            } 
            
        }
子窗体Form2:
        private void GoodWork()
        {
            if (ab==20)
            {
                this.DialogResult = DialogResult.OK; 
                 
                this.Close();  //******此处报错，所以无法关闭Form2********            
             }
        }应该如何，使符合条件的子窗体 Form2 关闭？

Answer 1

//经测试，没有出错
private void button2_Click(object sender, EventArgs e)
        {
            
            Form2 v = new Form2();
            //v.ShowDialog();--此处应去掉，不然你岂不是调用了两次form2
            this.Hide();
            if (v.ShowDialog() == DialogResult.OK)
            {
                this.Show();
            } 
            v.Dispose();//此处应释放掉
        }