版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/lujie_1996/article/details/79912797
开发环境
OS：Windows 7 64位
IDE：Microsoft VisualStudio 2010
数据库：SQL Server 2008 R2
最终效果
数据库
代码
Login.cs
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;
namespace Login
{
public partial class Login : Form
{
public Login()
{
InitializeComponent();
}
private void loginBtn_Click(object sender, EventArgs e)
{
string uername = name.Text.Trim();
string pwd = password.Text;
string constr = "Server=.;DataBase=Management;Integrated Security=True";
// 建立SqlConnection对象
SqlConnection con = new SqlConnection(constr);
// 打开连接
con.Open();
// 指定SQL语句
SqlCommand com = new SqlCommand("select account,password from register where account='" + uername + "' and password='" + pwd + "'", con);
// 建立SqlDataAdapter和DataSet对象
SqlDataAdapter da = new SqlDataAdapter(com);
DataSet ds = new DataSet();
int n = da.Fill(ds, "register");
if (n != 0)
{
MessageBox.Show("登录成功！", "提示");
label_title.Visible = false;
label_userName.Visible = false;
label_userPwd.Visible = false;
name.Visible = false;
password.Visible = false;
button_reg.Visible = false;
loginBtn.Visible = false;
}
else
{
MessageBox.Show("用户名或密码错误，请重新输入！", "提示");
name.Text = "";
password.Text = "";
name.Focus();
}
con.Close();
}
private void button_reg_Click(object sender, EventArgs e)
{
Register reg = new Register();
reg.ShowDialog();
}
private void Login_Load(object sender, EventArgs e)
{
}
private void InitializeComponent()
{
this.name = new System.Windows.Forms.TextBox();
this.password = new System.Windows.Forms.TextBox();
this.loginBtn = new System.Windows.Forms.Button();
this.button_reg = new System.Windows.Forms.Button();
this.label_userName = new System.Windows.Forms.Label();
this.label_userPwd = new System.Windows.Forms.Label();
this.label_title = new System.Windows.Forms.Label();
this.SuspendLayout();
//
// name
//
this.name.Location = new System.Drawing.Point(115, 89);
this.name.Name = "name";
this.name.Size = new System.Drawing.Size(174, 23);
this.name.TabIndex = 0;
//
// password
//
this.password.Location = new System.Drawing.Point(115, 130);
this.password.Name = "password";
this.password.PasswordChar = '*';
this.password.Size = new System.Drawing.Size(174, 23);
this.password.TabIndex = 1;
//
// loginBtn
//
this.loginBtn.BackColor = System.Drawing.SystemColors.Menu;
this.loginBtn.Location = new System.Drawing.Point(45, 186);
this.loginBtn.Name = "loginBtn";
this.loginBtn.Size = new System.Drawing.Size(335, 40);
this.loginBtn.TabIndex = 2;
this.loginBtn.Text = "登 录";
this.loginBtn.UseVisualStyleBackColor = false;
this.loginBtn.Click += new System.EventHandler(this.loginBtn_Click);
//
// button_reg
//
this.button_reg.BackColor = System.Drawing.SystemColors.Menu;
this.button_reg.Location = new System.Drawing.Point(299, 86);
this.button_reg.Name = "button_reg";
this.button_reg.Size = new System.Drawing.Size(81, 27);
this.button_reg.TabIndex = 3;
this.button_reg.Text = "注 册";
this.button_reg.UseVisualStyleBackColor = false;
this.button_reg.Click += new System.EventHandler(this.button_reg_Click);
//
// label_userName
//
this.label_userName.AutoSize = true;
this.label_userName.Location = new System.Drawing.Point(46, 92);
this.label_userName.Name = "label_userName";
this.label_userName.Size = new System.Drawing.Size(63, 14);
this.label_userName.TabIndex = 4;
this.label_userName.Text = "用 户 名";
//
// label_userPwd
//
this.label_userPwd.AutoSize = true;
this.label_userPwd.Location = new System.Drawing.Point(46, 133);
this.label_userPwd.Name = "label_userPwd";
this.label_userPwd.Size = new System.Drawing.Size(63, 14);
this.label_userPwd.TabIndex = 5;
this.label_userPwd.Text = "密 码";
//
// label_title
//
this.label_title.AutoSize = true;
this.label_title.Font = new System.Drawing.Font("微软雅黑", 18F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
this.label_title.Location = new System.Drawing.Point(66, 21);
this.label_title.Name = "label_title";
this.label_title.Size = new System.Drawing.Size(292, 31);
this.label_title.TabIndex = 6;
this.label_title.Text = "欢 迎 使 用 XX 管 理 系 统";
//
// Login
//
this.AutoScaleDimensions = new System.Drawing.SizeF(7F, 14F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.BackColor = System.Drawing.SystemColors.GradientInactiveCaption;
this.ClientSize = new System.Drawing.Size(424, 262);
this.Controls.Add(this.label_title);
this.Controls.Add(this.label_userPwd);
this.Controls.Add(this.label_userName);
this.Controls.Add(this.button_reg);
this.Controls.Add(this.loginBtn);
this.Controls.Add(this.password);
this.Controls.Add(this.name);
this.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
this.Name = "Login";
this.Text = "XX 管理系统";
this.Load += new System.EventHandler(this.Login_Load);
this.ResumeLayout(false);
this.PerformLayout();
}
}
}Register.cs
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;
namespace Login
{
public partial class Register : Form
{
public Register()
{
InitializeComponent();
}
private void button_reg_Click(object sender, EventArgs e)
{
string name = userName.Text.Trim();
string constr = "Server=.;DataBase=Management;Integrated Security=True";
// 建立SqlConnection对象
SqlConnection con = new SqlConnection(constr);
// 打开连接
con.Open();
// 指定SQL语句
SqlCommand com = new SqlCommand("select account from register where account='" + name + "'", con);
// 建立SqlDataAdapter和DataSet对象
SqlDataAdapter da = new SqlDataAdapter(com);
DataSet ds = new DataSet();
int n = da.Fill(ds, "register");
if (n != 0)
{
MessageBox.Show("用户名已存在！", "提示");
userName.Text = "";
userPwd.Text = "";
userPwdCheck.Text = "";
}
else if (userName.TextLength > 16)
{
MessageBox.Show("用户名太长，我怕你记不住，请换个短的吧！", "提示");
}
else if (userPwd.Text != userPwdCheck.Text)
{
MessageBox.Show("两次输入的密码不一致！", "提示");
userPwd.Text = "";
userPwdCheck.Text = "";
}
else if (userName.Text == "" || userPwd.Text == "")
{
MessageBox.Show("用户名或密码不能为空！", "提示");
}
else if (userPwd.TextLength < 6 || userPwd.TextLength > 12)
{
MessageBox.Show("密码长度不符合要求！", "提示");
userPwd.Text = "";
userPwdCheck.Text = "";
}
else
{
// 指定SQL语句
com = new SqlCommand("insert into register(account,password) values ('"
+ userName.Text + "','" + userPwd.Text + "')", con);
// 建立SqlDataAdapter和DataSet对象
com.ExecuteNonQuery();
com = null;
MessageBox.Show("注册成功！", "提示");
this.Close();
}
con.Close();
}
private void Register_Load(object sender, EventArgs e)
{
}
}
}