Cnetwinform窗體登錄注冊

1、用C#.Net寫的一個簡單的登錄及注冊的小程序1,首先設(shè)計登錄界面，共有三個，如下：上圖登錄及注冊為linklabel控件，其他為label控件;上圖為登陸界面，兩個textbox文本輸入框，注冊為linklabel控件；界面設(shè)計很簡單，不說了。2，代碼介紹：1） 主界面（Form1）：private void linkLabel1_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e) this.Hide(); Form3 f3 = new Form3(); f3.ShowDialog(); /顯示注冊界面； private v

2、oid linkLabel2_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e) this.Hide(); Form2 f = new Form2(); f.ShowDialog(); if (f.DialogResult = DialogResult.OK) this.Visible = true; /顯示登錄界面； private void Form1_FormClosing(object sender, FormClosingEventArgs e) try System.Diagnostics.Process myPr

3、ocesses = System.Diagnostics.Process.GetProcesses(); foreach (System.Diagnostics.Process myProcess in myProcesses) if ("LoginInterface.exe" = myProcess.ProcessName) myProcess.Kill(); catch (Exception ee) MessageBox.Show(ee.Message); /關(guān)掉程序；2） 注冊界面（Form3）本文使用的數(shù)據(jù)庫是sql sever2005,先在引用里加入：using

4、System.Data.SqlClient;以下為程序代碼： public partial class Form3 : Form public Form3() InitializeComponent(); bool flagRegister;/定義標志位，確認用戶注冊 string strConnect = "Data Source=CAI-PCSQLEXPRESS;Initial Catalog=MyData1;Persist Security Info=True;User ID=sa;Password=*" /連接數(shù)據(jù)庫字符串 private void button1_

5、Click(object sender, EventArgs e) if (textBox1.Text.Length >= 4) && (textBox1.Text.Length <= 12) && (textBox2.Text.Length >= 6) && (textBox3.Text.Length >= 6) flagRegister = true; else if (textBox1.Text.Length < 4) | (textBox1.Text.Length > 12) MessageBox.Sh

6、ow("用戶名長度不在約定范圍內(nèi),請重新輸入！", "提示"); return; if (textBox2.Text.Length < 6) MessageBox.Show("密碼長度不足6位，請重新輸入！","提示"); return; if (textBox3.Text.Length < 6) MessageBox.Show("請重新輸入郵箱！", "提示"); return; /判斷用戶名條件； if (UserFlag = true) MessageBox

7、.Show("用戶已經(jīng)存在，請重新輸入！"); return; if (flagRegister = true) /確認用戶注冊后，把用戶寫入數(shù)據(jù)庫 SqlConnection conConnection = new SqlConnection(strConnect); conConnection.Open(); string cmd = "insert into 用戶(用戶名,密碼,email) values ('" + textBox1.Text + "'," + "'" + textB

8、ox2.Text + "'," + "'" + textBox3.Text + "') " SqlCommand com = new SqlCommand(cmd, conConnection); com.ExecuteNonQuery(); conConnection.Close(); MessageBox.Show("注冊成功！點擊確定，返回登錄界面。", "提示"); this.Close(); Form1 f1 = new Form1(); f1.label2.T

9、ext = "歡迎你，" + textBox1.Text; = false; f1.label3.Visible = false; f1.linkLabel1.Visible = false; f1.linkLabel2.Visible = false; f1.label2.Visible = true; f1.Show(); public bool UserFlag; /定義標志位，來確認用戶是否存在 private void textBox1_TextChanged(object sender, EventArgs e) SqlConnection conConnect

10、ion = new SqlConnection(strConnect); conConnection.Open(); string cmd = "select 用戶名 from 用戶" SqlCommand com = new SqlCommand(cmd, conConnection); SqlDataReader readerUser = com.ExecuteReader(); while (readerUser.Read() if (textBox1.Text = readerUser"用戶名".ToString().Trim() label5.

11、Text = "用戶已存在，請重新輸入！" UserFlag = true; /textBox1.Text = "" return; else if (textBox1.Text != readerUser"用戶名".ToString().Trim() label5.Text = "恭喜你，該用戶名可以使用。" UserFlag = false; /判斷用戶名是否滿足條件 private void textBox3_TextChanged(object sender, EventArgs e) int index

12、= textBox3.Text.IndexOf(""); if (index < 1) label7.Text = "郵箱格式不正確，請重新輸入！" else label7.Text = "郵箱格式正確" /判斷郵箱格式是否正確 3） 登錄界面（Form2）本文使用的數(shù)據(jù)庫是sql sever2005,先在引用里加入：using System.Data.SqlClient;以下為程序代碼：string User, Pwd; /用戶名，密碼bool flagshow = false;/用來標注登錄名是否存在于數(shù)據(jù)庫private

13、void linkLabel1_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e) this.Hide(); Form3 f3 = new Form3(); f3.ShowDialog(); /顯示注冊界面 private void button1_Click(object sender, EventArgs e) /登錄 string strConnect = "Data Source=CAI-PCSQLEXPRESS;Initial Catalog=MyData1;Persist Security Info=Tr

14、ue;User ID=sa;Password=*" SqlConnection conConnection = new SqlConnection(strConnect); conConnection.Open(); string cmd = "select 用戶名,密碼,email from 用戶" SqlCommand com = new SqlCommand(cmd, conConnection); SqlDataReader reader = com.ExecuteReader(); while (reader.Read()/從數(shù)據(jù)庫讀取用戶信息 User

15、 = reader"用戶名".ToString(); Pwd = reader"密碼".ToString(); if (User.Trim () = textBox1.Text & Pwd.Trim () = textBox2.Text) flagshow = true; /用戶名存在于數(shù)據(jù)庫，則為true reader.Close(); conConnection.Close(); if (flagshow = true) showMainForm();/用戶存在，返回登錄界面 else MessageBox.Show("用戶不存在或

16、密碼錯誤！", "提示"); return; private void showMainForm()/登錄成功，顯示主界面 this.Close(); Form1 f1 = new Form1(); f1.label1.Visible = false; f1.label3.Visible = false; f1.linkLabel1.Visible = false; f1.linkLabel2.Visible = false; f1.label2.Visible = true; f1.label2.Text = "歡迎你，" + textBox1 .Text ; f1.Show(); 3，為美化窗體，可下載winfor