108 lines
3.3 KiB
C#
108 lines
3.3 KiB
C#
using System.Data;
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using System.Text;
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Data;
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using System.Windows.Documents;
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using System.Windows.Input;
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using System.Windows.Media;
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using System.Windows.Media.Imaging;
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using System.Windows.Navigation;
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using System.Windows.Shapes;
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using MahApps.Metro.Controls;
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using Npgsql;
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using Npgsql.Replication;
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namespace PrototypWPFHAG;
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/// <summary>
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/// Interaction logic for MainWindow.xaml
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/// </summary>
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public partial class MainWindow : MetroWindow
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{
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public MainWindow()
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{
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InitializeComponent();
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// TestConnection();
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// Console.ReadKey();
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}
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private void loginButton_Click(object sender, RoutedEventArgs e)
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{
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// 从用户输入中获取用户名和密码
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string username = UsernameTextBox.Text; // 获取用户名
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string password = PasswordTextBox.Password; // 获取密码
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// 调用 ValidateUser 方法验证用户凭据
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if (ValidateUser(username, password))
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{
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MessageBox.Show("ok", "Login Successful", MessageBoxButton.OK, MessageBoxImage.Error);
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}
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else
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{
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// 如果验证失败，显示错误信息
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MessageBox.Show("Invalid username or password.", "Login Failed", MessageBoxButton.OK, MessageBoxImage.Error);
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}
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}
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private bool ValidateUser(string username, string password)
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{
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// 获取数据库连接
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using (var con = GetConnection())
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{
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con.Open(); // 打开数据库连接
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string query = "SELECT COUNT(*) FROM USER WHERE UserName = @username AND Password = @password;";
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using (var cmd = new NpgsqlCommand(query, con))
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{
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// 使用参数化查询防止 SQL 注入
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cmd.Parameters.AddWithValue("@username", username);
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cmd.Parameters.AddWithValue("@password", password);
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// 执行查询并获取结果
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int count = (int)cmd.ExecuteScalar();
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return count > 0; // 如果匹配记录数量大于 0，返回 true
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}
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}
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}
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private static void TestConnection()
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{
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using (NpgsqlConnection con = GetConnection())
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{
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con.Open();
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if (con.State == ConnectionState.Open)
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{
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Console.WriteLine("Connected to Server");
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}
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}
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}
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private static NpgsqlConnection GetConnection()
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{
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return new NpgsqlConnection(@"Server=localhost;Port=5432;User Id=postgres;Password=postgres;Database=postgres;");
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}
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//class Program
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//{
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// static void Main(string[] args)
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// {
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// TestConnection();
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// Console.ReadKey();
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// }
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// private static void TestConnection()
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// {
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// using(NpgsqlConnection con = GetConnection()){
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// con.Open();
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// if (con.State == ConnectionState.Open) {
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// Console.WriteLine("Connected to Server");
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// }
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// }
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// }
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// private static NpgsqlConnection GetConnection()
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// {
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// return new NpgsqlConnection(@"Server=localhost;Port=5432;User Id=postgres;Password=postgres;Database=TestServer;");
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// }
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//}
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} |