private void button1_Click(object sender, EventArgs e) { register = new LoginControllerImpl(); string jobnumber = textBox1.Text; string password = textBox2.Text; string workunit = textBox3.Text; WorkerEntity obj = new WorkerEntity(jobnumber, password, workunit); register.JudgeNull(obj); bool term = false; //判断是否添加成功 bool judge = false; //判断是否重复添加 if (jobnumber != "" && password != "" && workunit != "") { term = register.InsertDatabase(obj); //判断是否添加成功 judge = register.Register(obj); //判断是否重复添加 } if (judge == true) { MessageBox.Show("用户已注册!"); } else { if (term == true) { MessageBox.Show("注册成功!"); Login login = new Login(); this.Hide(); login.Show(); } } }