WPF 增删改查的例子

以下是一个简单的 WPF 增删改查的例子：

1. 创建一个 WPF 应用程序，命名为 "WpfCRUDExample"。在主窗口中添加以下控件：

<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto"/>
        <RowDefinition Height="Auto"/>
        <RowDefinition Height="Auto"/>
        <RowDefinition Height="Auto"/>
        <RowDefinition Height="*"/>
    </Grid.RowDefinitions>
    <Label Grid.Row="0" Content="ID:"/>
    <TextBox Grid.Row="0" Grid.Column="1" x:Name="txtId"/>
    <Label Grid.Row="1" Content="Name:"/>
    <TextBox Grid.Row="1" Grid.Column="1" x:Name="txtName"/>
    <Label Grid.Row="2" Content="Email:"/>
    <TextBox Grid.Row="2" Grid.Column="1" x:Name="txtEmail"/>
    <Button Grid.Row="3" Content="Add" x:Name="btnAdd" Click="btnAdd_Click"/>
    <Button Grid.Row="3" Grid.Column="1" Content="Update" x:Name="btnUpdate" Click="btnUpdate_Click"/>
    <Button Grid.Row="3" Grid.Column="2" Content="Delete" x:Name="btnDelete" Click="btnDelete_Click"/>
    <DataGrid Grid.Row="4" x:Name="dgUsers" AutoGenerateColumns="False">
        <DataGrid.Columns>
            <DataGridTextColumn Header="ID" Binding="{Binding Id}"/>
            <DataGridTextColumn Header="Name" Binding="{Binding Name}"/>
            <DataGridTextColumn Header="Email" Binding="{Binding Email}"/>
        </DataGrid.Columns>
    </DataGrid>
</Grid>

2. 在代码中定义 User 类和 Users 列表：

public class User
{
    public int Id { get; set; }
    public string Name { get; set; }
    public string Email { get; set; }
}

public class Users : ObservableCollection<User>
{
    public Users()
    {
        Add(new User { Id = 1, Name = "John Doe", Email = "john.doe@example.com" });
        Add(new User { Id = 2, Name = "Jane Doe", Email = "jane.doe@example.com" });
        Add(new User { Id = 3, Name = "Bob Smith", Email = "bob.smith@example.com" });
    }
}

3. 在窗口的构造函数中初始化数据和绑定 DataGrid：

public MainWindow()
{
    InitializeComponent();
    DataContext = this;
    Users = new Users();
    dgUsers.ItemsSource = Users;
}
public Users Users { get; set; }

4. 实现增删改查的事件处理程序：

private void btnAdd_Click(object sender, RoutedEventArgs e)
{
    int id = int.Parse(txtId.Text);
    string name = txtName.Text;
    string email = txtEmail.Text;
    Users.Add(new User { Id = id, Name = name, Email = email });
}

private void btnUpdate_Click(object sender, RoutedEventArgs e)
{
    int id = int.Parse(txtId.Text);
    string name = txtName.Text;
    string email = txtEmail.Text;
    foreach (User user in Users)
    {
        if (user.Id == id)
        {
            user.Name = name;
            user.Email = email;
            break;
        }
    }
}

private void btnDelete_Click(object sender, RoutedEventArgs e)
{
    int id = int.Parse(txtId.Text);
    User userToRemove = null;
    foreach (User user in Users)
    {
        if (user.Id == id)
        {
            userToRemove = user;
            break;
        }
    }
    if (userToRemove != null)
    {
        Users.Remove(userToRemove);
    }
}

5. 运行应用程序并测试增删改查功能。