Question

在我的WPF C＃项目中使用来自DB（Sqlite）的数据填充DataGrid时遇到问题。

我已使用Name（dataGrid_Students）在我的XAML文件中定义了DataGrid：

<DataGrid Name="dataGrid_Students" Grid.Row="0" Grid.Column="0"
          RenderOptions.ClearTypeHint="Enabled"
          TextOptions.TextFormattingMode="Display"
          CanUserAddRows="False"
          CanUserDeleteRows="False"
          SelectionUnit="FullRow" 
          AutoGenerateColumns="false"  
          >
    <DataGrid.Columns>
        <DataGridTextColumn Header="Index Number" />
        <DataGridTextColumn Header="First Name" /> 
        <DataGridTextColumn Header="Last Name" /> 
    </DataGrid.Columns>
</DataGrid>

在我定义了DataGrid组件的Window的构造函数中的C＃文件中，我调用了方法initDataGrid();

public StudentForm() {
    InitializeComponent();
    this.WindowStartupLocation = WindowStartupLocation.CenterScreen;
    initDataGrid();
}

其中包含此代码：

private void initDataGrid() { 
    //dataGrid_Student.DataContext = dbManager.Students; does not work
    dataGrid_Student.ItemsSource = dbManager.Students;
}

所以问题是我的DataGrid是空的。我已经检查过我的学生列表是否为空，但它不是，它包含所有数据。那么我为了用Data填充DataGrid还缺少什么？

更新

我的学生班：

[Table("student")]
class Student {

    [Key] // this is a primary key in my table
    [Column(name:"brind")]
    public int Brind { get; set; }
    [Column(name:"first_name")]
    public string FirstName { get; set; }
    [Column(name:"last_name")]
    public string LastName { get; set; }
}

将我的属性从Student类绑定到此列：

<DataGrid Name="dataGrid_Student" Grid.Row="0" Grid.Column="0"
          RenderOptions.ClearTypeHint="Enabled"
          TextOptions.TextFormattingMode="Display"
          CanUserAddRows="False"
          CanUserDeleteRows="False"
          SelectionUnit="FullRow" 
          AutoGenerateColumns="false"  
          >
    <DataGrid.Columns>
        <DataGridTextColumn Header="Index Number" Binding="{Binding Brind}" /> 
        <DataGridTextColumn Header="First Name"  Binding="{Binding FirstName}" />  
        <DataGridTextColumn Header="Last Name" Binding="{Binding LastName}" /> 
    </DataGrid.Columns>
</DataGrid>

DataGrid仍为空。

我的dbManager实例是这个类：

class ManagerDBContext : DbContext {

    public ManagerDBContext() : base("Student_DbContext") {
        Database.SetInitializer<ManagerDBContext>(null);
    }
    public DbSet<User> Users { get; set; }
    public DbSet<Student> Students { get; set; }
}

Answer 1

您缺少列的绑定部分，因为您已将AutoGenerateColumns设置为false，

<DataGrid.Columns>
        <DataGridTextColumn Header="Index Number" Binding="{Binding IndexNumber}" />
        <DataGridTextColumn Header="First Name" Binding="{Binding FirstName}"  /> 
        <DataGridTextColumn Header="Last Name" Binding="{Binding LastName}" /> 
</DataGrid.Columns>

您还需要在绑定时转换为List

private void initDataGrid() { 
    //dataGrid_Student.DataContext = dbManager.Students; does not work
    dataGrid_Student.ItemsSource = dbManager.Students.ToList();
}

WPF DataGrid未填充数据

1 个答案: