实现如图所示登录界面,当输入正确用户名及密码时,转到主界面,否则给出错误提示。要求不同身份的登陆者拥有不同的操作权限。
源代码:
1.初始化三个string类型的变量分别用来存储用户名、密码和身份。
- private void Form1_Load(object sender, EventArgs e)
- {
- yhm=mm="";
- sf=radioButton1.Text;
- }
2.为三个单选按钮添加CheckedChanged事件处理程序
1>学生:
- private void radioButton1_CheckedChanged(object sender, EventArgs e)
- {
- if(radioButton1.Checked)
- {
- sf=radioButton1.Text;
- checkBox1.Checked = true;
- checkBox2.Checked=checkBox3.Checked=checkBox4.Checked=checkBox5.Checked=false;
- }
-
- }
2>教师:
- private void radioButton2_CheckedChanged(object sender, EventArgs e)
- {
- if (radioButton2.Checked)
- {
- sf = radioButton2.Text;
- checkBox1.Checked=checkBox2.Checked = true;
- checkBox3.Checked = checkBox4.Checked = checkBox5.Checked = false;
- }
-
- }
3>管理员:
- private void radioButton3_CheckedChanged(object sender, EventArgs e)
- {
- if (radioButton3.Checked)
- {
- sf = radioButton3.Text;
- checkBox1.Checked = checkBox2.Checked = checkBox3.Checked = checkBox4.Checked = checkBox5.Checked = true;
- }
-
- }
3.为四个Button按钮添加Click事件:
1>确定:
- private void button1_Click(object sender, EventArgs e)
- {
- yhm = textBox1.Text.Trim();
- mm = textBox2.Text.Trim();
- if (yhm == "xs" && mm == "xs" && sf == "学生")
- {
- tabControl1.SelectedTab = tabPage2;
- panel2.Visible = true;
- button4.Enabled = button5.Enabled = button6.Enabled = button7.Enabled = false;
- panel1.Visible = false;
- }
-
-
- else if (yhm == "js" && mm == "js" && sf == "教师")
- {
- tabControl1.SelectedTab = tabPage2;
- panel2.Visible = true;
- button3.Enabled=button4.Enabled = true;
- button5.Enabled = button6.Enabled = button7.Enabled = false;
- panel1.Visible = false;
- }
-
- else if (yhm == "gly" && mm == "gly" && sf == "管理员")
- {
- tabControl1.SelectedTab = tabPage2;
- panel2.Visible = true;
- button3.Enabled=button4.Enabled = button5.Enabled = button6.Enabled = button7.Enabled = true;
- panel1.Visible = false;
- }
-
- else
- MessageBox.Show("用户名或密码错误","登录失败");
- }
2>取消:
- private void button2_Click(object sender, EventArgs e)
- {
- this.Close();
- }
3>注销登录:
- private void button8_Click(object sender, EventArgs e)
- {
- panel1.Visible = true;
- panel2.Visible = false;
- textBox1.Text = textBox2.Text = "";
- radioButton1.Checked = true;
- tabControl1.SelectedTab = tabPage1;
- }
4>退出系统:
- private void button9_Click(object sender, EventArgs e)
- {
- Application.Exit();
- }
运行结果展示图: