VS2012实现简单登录界面

2020-01-17 22:12:03

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本文实例为大家分享了VS2012实现登录界面的具体代码，供大家参考，具体内容如下

这个是第一个界面的代码：

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;using System.Data.SqlClient;namespace 登录x{  public partial class Form1 : Form  {    public Form1()    {      InitializeComponent();    }    private void userInfoBindingNavigatorSaveItem_Click(object sender, EventArgs e)    {      this.Validate();      this.userInfoBindingSource.EndEdit();      this.tableAdapterManager.UpdateAll(this.studentRecordDataSet);    }    private void Form1_Load(object sender, EventArgs e)    {      // TODO: 这行代码将数据加载到表“studentRecordDataSet1.UserInfo”中。您可以根据需要移动或删除它。      this.userInfoTableAdapter1.Fill(this.studentRecordDataSet1.UserInfo);      // TODO: 这行代码将数据加载到表“studentRecordDataSet.UserInfo”中。您可以根据需要移动或删除它。      this.userInfoTableAdapter.Fill(this.studentRecordDataSet.UserInfo);    }    private void passwordLabel_Click(object sender, EventArgs e)    {    }    private void button1_Click(object sender, EventArgs e)    {      string connString = @"Data Source=.;Initial Catalog=studentrecord;Integrated Security=True";      SqlConnection conn = new SqlConnection(connString);      string sql = "select count(*) from UserInfo where username='" + userNameComboBox.Text + "'and password='" + passwordTextBox.Text + "'";      conn.Open();      SqlCommand comm = new SqlCommand(sql, conn);      int num = (int)comm.ExecuteScalar();      if (num > 0)      {        Form2 frm2 = new Form2();        frm2.Show();      }      else      {        MessageBox.Show("对不起，用户名和密码并不匹配！", "登陆失败");      }      conn.Close();    }    private void userNameComboBox_SelectedIndexChanged(object sender, EventArgs e)    {    }    private void passwordTextBox_TextChanged(object sender, EventArgs e)    {    }  }}

这个是第二个界面的代码：

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;namespace 登录x{  public partial class Form2 : Form  {    public Form2()    {      InitializeComponent();    }    private void label1_Click(object sender, EventArgs e)    {    }  }}

运行结果如图：