基于WinForms(C#)的用户登录界面(VisualStudio2013) |
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1.界面设计
其中包含验证码、找回密码、注册账号、登陆系统等基本功能 用户登陆界面代码如下: 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 GlobeSchool.登陆界面 { public partial class LoginForm : Form { #region 数据库连接 string strcon = @"Data Source=DESKTOP-NHFOQPB;Initial catalog=InformationRegister;Integrated Security=True"; #endregion public LoginForm() { InitializeComponent(); } private void textBox2_TextChanged(object sender, EventArgs e) { } private void LoginForm_Load(object sender, EventArgs e) { txt_Name.Focus(); //光标跳到用户名框 btn_vercode_Click(sender, e); } private void cbo_LoginType_SelectedIndexChanged(object sender, EventArgs e) { } #region 取消按钮+btn_Cancel /// /// 取消 /// /// /// private void btn_Cancel_Click(object sender, EventArgs e) { this.Close(); } #endregion #region 登陆按钮+btn_Login /// /// 登陆button /// /// /// private void btn_Login_Click(object sender, EventArgs e) { if (txt_Name.Text == "" || txt_PassWord.Text == "") /*判断用户名或密码是否填写完整*/ { MessageBox.Show("用户名或密码未填写,请填写完善!"); } else { SqlConnection con = new SqlConnection(strcon); try { string sql = "select * from UserLogin where UserLogin.UserName=@username and UserLogin.UserPassword=@pwd"; SqlCommand cmd = new SqlCommand(sql, con); cmd.Parameters.AddWithValue("@username", txt_Name.Text); cmd.Parameters.AddWithValue("@pwd", txt_PassWord.Text); con.Open(); SqlDataAdapter da = new SqlDataAdapter(cmd); DataTable dt = new DataTable(); da.Fill(dt); if ((dt.Rows.Count > 0) && (txt_Verification.Text == RANS.Text)) { MessageBox.Show("欢迎使用本系统!"); MainForm aq = new MainForm(); aq.Show(); this.Hide(); } else { if (!(dt.Rows.Count > 0)) { MessageBox.Show("用户名或密码错误!请重新输入!"); txt_PassWord.Text = ""; txt_PassWord.Focus(); btn_vercode_Click(sender, e); //重新生成验证码 txt_Verification.Text = ""; } if ((dt.Rows.Count > 0) && (txt_Verification.Text != RANS.Text)) { MessageBox.Show("验证码输入错误!请重新输入!"); btn_vercode_Click(sender, e); //重新生成验证码 txt_Verification.Text = ""; txt_Verification.Focus(); } } } catch (Exception ex) { MessageBox.Show(ex.Message); } finally { con.Close(); } } } #endregion #region 回车键光标跳转至密码框 /// /// /*通过回车键光标跳转至密码框*/ /// /// /// private void txt_Name_KeyPress(object sender, KeyPressEventArgs e) { if (e.KeyChar == 13) { txt_PassWord.Focus(); } } #endregion /*回车登录功能*/ private void txt_PassWord_KeyPress(object sender, KeyPressEventArgs e) { if (e.KeyChar == 13) { txt_Verification.Focus(); } } //注册界面入口 private void btn_Register_Click(object sender, EventArgs e) { RegisterForm am = new RegisterForm(); am.Show(); this.Hide(); } #region 产生随机验证码 private void btn_vercode_Click(object sender, EventArgs e) { Random ran = new Random(); RANS.Text = ran.Next(1000, 9999).ToString(); } #endregion private void linkLabel1_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e) { btn_vercode_Click(sender, e); } private void txt_Verification_TextChanged(object sender, EventArgs e) { } private void txt_Verification_KeyPress(object sender, KeyPressEventArgs e) { if (e.KeyChar == 13) { btn_Login_Click(sender,e); } } private void txt_Name_TextChanged(object sender, EventArgs e) { } private void btn_PasswordRecovery_Click(object sender, EventArgs e) { PassWordRecoveryForm mm = new PassWordRecoveryForm(); mm.Show(); this.Hide(); } } } 2.用户注册界面
代码如下: using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Data.SqlClient; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; namespace GlobeSchool.登陆界面 { public partial class RegisterForm : Form { /* 数据库连接 */ string strcon = @"Data Source=DESKTOP-NHFOQPB;Initial catalog=InformationRegister;Integrated Security=True"; public RegisterForm() { InitializeComponent(); } private void btn_OK_Click(object sender, EventArgs e) { /* 将信息添加到数据库 */ SqlConnection sqlcon = null; if (txtName.Text == "" || txtEmail.Text == "" || txtPassWord.Text == "" || txtPhone.Text == "" || txtRePassWord.Text == "") { MessageBox.Show("(*)必填信息未填满!请填满!"); } else { if (txtPassWord.Text == txtRePassWord.Text) { try { string stuID = txtNums.Text.Trim(); string stuName = txtName.Text.Trim(); string stuEmail = txtEmail.Text.Trim(); string stuPassWord = txtPassWord.Text.Trim(); string stuPhone = txtPhone.Text.Trim(); sqlcon = new SqlConnection(strcon); SqlCommand command = new SqlCommand(); command.CommandText = "INSERT INTO UserLogin(UserName,UserPassword,Id,Phone,Email)VALUES('" + stuName + "','" + stuPassWord + "','" + stuID + "','" + stuPhone + "','" + stuEmail + "')"; command.CommandType = CommandType.Text; command.Connection = sqlcon; sqlcon.Open(); if (command.ExecuteNonQuery() == 1) { MessageBox.Show("注册成功!\n请重新登录!"); } } catch (Exception ex) { MessageBox.Show(ex.Message); } finally { sqlcon.Close(); } LoginForm dd = new LoginForm(); dd.Show(); this.Close(); } else { MessageBox.Show("密码错误,请重新输入密码!"); txtPassWord.Text = ""; txtRePassWord.Text = ""; txtPassWord.Focus(); } } } private void RegisterForm_Load(object sender, EventArgs e) { txtName.Focus(); } private void btn_Cancel_Click(object sender, EventArgs e) { LoginForm mm = new LoginForm(); mm.Show(); this.Close(); } private void txtName_KeyPress(object sender, KeyPressEventArgs e) { if (e.KeyChar == 13) { txtNums.Focus(); } } private void txtNums_KeyPress(object sender, KeyPressEventArgs e) { if (e.KeyChar == 13) { txtPhone.Focus(); } } private void txtPhone_KeyPress(object sender, KeyPressEventArgs e) { if (e.KeyChar == 13) { txtEmail.Focus(); } } private void txtEmail_KeyPress(object sender, KeyPressEventArgs e) { if (e.KeyChar == 13) { txtPassWord.Focus(); } } private void txtPassWord_KeyPress(object sender, KeyPressEventArgs e) { if (e.KeyChar == 13) { txtRePassWord.Focus(); } } private void txtRePassWord_KeyPress(object sender, KeyPressEventArgs e) { if (e.KeyChar == 13) { btn_OK_Click(sender,e); } } } } 3.找回密码界面设计
代码如下: using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Data.SqlClient; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; namespace GlobeSchool.登陆界面 { public partial class PassWordRecoveryForm : Form { /*数据库连接*/ string strcon = @"Data Source=DESKTOP-NHFOQPB;Initial catalog=InformationRegister;Integrated Security=True"; public PassWordRecoveryForm() { InitializeComponent(); } private void PassWordRecoveryForm_Load(object sender, EventArgs e) { txt_username.Focus(); } private void txt_username_KeyPress(object sender, KeyPressEventArgs e) { if (e.KeyChar == 13) { txt_nums.Focus(); } } private void txt_nums_TextChanged(object sender, EventArgs e) { } private void txt_nums_KeyPress(object sender, KeyPressEventArgs e) { if (e.KeyChar == 13) { btn_search_Click(sender,e); } } private void btn_search_Click(object sender, EventArgs e) { SqlConnection con = new SqlConnection(strcon); string sql = "select UserLogin.UserPassword from UserLogin where UserLogin.UserName=@username and UserLogin.Id=@nums"; SqlCommand cmd = new SqlCommand(sql, con); cmd.Parameters.AddWithValue("@username", txt_username.Text); cmd.Parameters.AddWithValue("@nums", txt_nums.Text); con.Open(); SqlDataAdapter da = new SqlDataAdapter(cmd); DataTable dt = new DataTable(); da.Fill(dt); if (dt.Rows.Count > 0) { //SqlCommand cmd1 = new SqlCommand("select 班级 from UserLogin where id=..."); //string banji = cmd.executescalar().toString(); password_appear.Text = "您的密码是:" + cmd.ExecuteScalar(); password_appear.Visible = true; } else { MessageBox.Show("信息不匹配,请重新输入!"); txt_username.Text = ""; txt_nums.Text = ""; txt_username.Focus(); } //if() //else //{ //MessageBox.Show("信息不匹配,请重新输入!"); //txt_username.Text = ""; //txt_nums.Text = ""; //txt_username.Focus(); //} } private void btn_exit_Click(object sender, EventArgs e) { LoginForm ak = new LoginForm(); ak.Show(); this.Close(); } } }
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