app.config gelöscht. MainWindow mit Datenbank verbunden

PrototypWPFHAG/MainWindow.xaml

@@ -1,23 +1,32 @@
-<mah:MetroWindow  xmlns:mah="http://metro.mahapps.com/winfx/xaml/controls" x:Class="PrototypWPFHAG.MainWindow"
-        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
-        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
-        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
-        xmlns:local="clr-namespace:PrototypWPFHAG"
-        mc:Ignorable="d"
-        Title="Prototype" 
-		Height="450" 
-		Width="800"
-		TitleCharacterCasing="Normal"
-		WindowTitleBrush="Firebrick"
-		Icon="pack://application:,,,/Images/databaseicon.png"
-		ResizeMode="CanResizeWithGrip">
-	<Grid>
-		<Border BorderBrush="Firebrick" BorderThickness="3">
-		</Border>
-		<StackPanel>
-			<TextBlock Width="120" Margin="100" Background="AliceBlue"></TextBlock>
-			<Button Height="25" Width="44" Content="Log in"/>
-		</StackPanel>
-	</Grid>
-</mah:MetroWindow>
+<mah:MetroWindow xmlns:mah="http://metro.mahapps.com/winfx/xaml/controls"
+                 x:Class="PrototypWPFHAG.MainWindow"
+                 xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+                 xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+                 xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+                 xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+                 xmlns:local="clr-namespace:PrototypWPFHAG"
+                 mc:Ignorable="d"
+                 Title="Prototype" 
+                 Height="450" 
+                 Width="800"
+                 TitleCharacterCasing="Normal"
+                 WindowTitleBrush="Firebrick"
+                 Icon="pack://application:,,,/Images/databaseicon.png"
+                 ResizeMode="CanResizeWithGrip">
+    <Grid>
+        <Border BorderBrush="Firebrick" BorderThickness="3" Padding="20">
+            <StackPanel VerticalAlignment="Center" HorizontalAlignment="Center">
+                <!-- 用户名标签和输入框 -->
+                <TextBlock Text="USERNAME" Margin="0,10,0,0" FontSize="14" FontWeight="Bold" />
+                <TextBox Width="200" Height="30" Margin="0,5,0,0" x:Name="UsernameTextBox" />
+
+                <!-- 密码标签和输入框 -->
+                <TextBlock Text="PASSWORD" Margin="0,10,0,0" FontSize="14" FontWeight="Bold" />
+                <PasswordBox Width="200" Height="30" Margin="0,5,0,0" x:Name="PasswordTextBox" />
+
+                <!-- 登录按钮 -->
+                <Button Height="30" Width="100" Content="Log in" Margin="0,20,0,0" Click="loginButton_Click" />
+            </StackPanel>
+        </Border>
+    </Grid>
+</mah:MetroWindow>

PrototypWPFHAG/MainWindow.xaml.cs

@@ -23,10 +23,49 @@ public partial class MainWindow : MetroWindow
     public MainWindow()
     {
         InitializeComponent();
+       // TestConnection();
+       // Console.ReadKey();
 
-        TestConnection();
-        Console.ReadKey();
+    }
 
+    private void loginButton_Click(object sender, RoutedEventArgs e)
+    {
+        // 从用户输入中获取用户名和密码
+        string username = UsernameTextBox.Text;          // 获取用户名
+        string password = PasswordTextBox.Password;      // 获取密码
+
+        // 调用 ValidateUser 方法验证用户凭据
+        if (ValidateUser(username, password))
+        {
+            MessageBox.Show("ok", "Login Successful", MessageBoxButton.OK, MessageBoxImage.Error);
+
+        }
+        else
+        {
+            // 如果验证失败，显示错误信息
+            MessageBox.Show("Invalid username or password.", "Login Failed", MessageBoxButton.OK, MessageBoxImage.Error);
+        }
+    }
+
+    private bool ValidateUser(string username, string password)
+    {
+        // 获取数据库连接
+        using (var con = GetConnection())
+        {
+            con.Open(); // 打开数据库连接
+            string query = "SELECT COUNT(*) FROM USER WHERE UserName = @username AND Password = @password;";
+
+            using (var cmd = new NpgsqlCommand(query, con))
+            {
+                // 使用参数化查询防止 SQL 注入
+                cmd.Parameters.AddWithValue("@username", username);
+                cmd.Parameters.AddWithValue("@password", password);
+
+                // 执行查询并获取结果
+                int count = (int)cmd.ExecuteScalar();
+                return count > 0; // 如果匹配记录数量大于 0，返回 true
+            }
+        }
     }
 
     private static void TestConnection()

PrototypWPFHAG/app.config

@@ -1,7 +0,0 @@
-<connectionStrings>
-	<add name="MyConnectionString"
-	  providerName="Npgsql"
-	  connectionString="Server=127.0.0.1;Port=7854;
-    Database=mydatabase;User Id=admin;Password=123456;" />
-</connectionStrings>
-