Question

我有一个datagridview，我想将它与四个连接的表绑定彼此和照片解释了这种关系 relations of four tables

我尝试将其与wpf绑定，但不能
我的loadData代码是：

 CollegeContext cd = new CollegeContext(); 

 var query = (from sc in cd.StudentStatments

     join l in cd.Levels on sc.IdLevel equals l.Id
     join b in cd.Branches on sc.IdBranch equals b.Id
     join su in cd.Subjects on sc.IdSubject equals su.Id

     select new DGItem
     {
          NameSub = su.Name,
          TypeOfBranch = b.TypeOfBranch,
          Code = su.Code,
          NameLev=l.Name,
          NumOfStudent = sc.NumberOfStudent
      }).ToList();
      studentStatmentsDataGrid.ItemsSource = query;

我的xaml是：

<DataGrid x:Name="studentStatmentsDataGrid" AutoGenerateColumns="False" FlowDirection="RightToLeft" EnableRowVirtualization="True" ItemsSource="{Binding }" Margin="128,284,0,0" RowDetailsVisibilityMode="VisibleWhenSelected">
     <DataGrid.Columns>
          <DataGridTextColumn  Binding="{Binding Subject.Name}" Header="NameSubjects" Width="SizeToHeader"/>
          <DataGridTextColumn  Binding="{Binding TypeOfBranch}" Header=" Branch" Width="SizeToHeader"/>
          <DataGridTextColumn  Binding="{Binding Code}" Header=" code" Width="SizeToHeader"/>
          <DataGridTextColumn  Binding="{Binding Levels.Name}" Header=" Level" Width="SizeToHeader"/>
          <DataGridTextColumn  Binding="{Binding NumberOfStudent}" Header="NumberOfStudent" Width="SizeToHeader"/>
     </DataGrid.Columns>
</DataGrid>

和我的用户控制资源：

<UserControl.Resources>
    <Color x:Key="1">#FF3580BF</Color>
    <Color x:Key="Color1">#FFECE3E3</Color>
    <Color x:Key="Color2">#FF3580BF</Color>
    <Astmara6:Branches x:Key="branches"/>
    <CollectionViewSource x:Key="branchesViewSource" Source="{Binding _Branches, Source={StaticResource branches}}"/>
    <Astmara6:Section x:Key="section"/>
    <CollectionViewSource x:Key="sectionsViewSource" Source="{Binding Sections, Source={StaticResource section}}"/>
    <Astmara6:Levels x:Key="levels"/>
    <CollectionViewSource x:Key="levelsViewSource" Source="{Binding _Levels, Source={StaticResource levels}}"/>
    <Astmara6:Subjects x:Key="subjects"/>
    <CollectionViewSource x:Key="subjectsViewSource" Source="{Binding _Subjects, Source={StaticResource subjects}}"/>
    <Astmara6:TeachSubBranch x:Key="teachSubBranch"/>
    <CollectionViewSource x:Key="subjectsViewSource1" Source="{Binding Subjects, Source={StaticResource teachSubBranch}}"/>
    <Astmara6:StudentStatment x:Key="studentStatment"/>
    <CollectionViewSource x:Key="studentStatmentsViewSource" Source="{Binding StudentStatments, Source={StaticResource studentStatment}}"/>
</UserControl.Resources>

我希望在datagridview中显示su.Name，b.TypeOfBranch，su.Code，l.Name，sc.NumberOfStudent，但不会显示所有数据

Answer 1

通过设置ItemsSource = {Binding}，将其绑定到DataGrid.DataContext。当您在代码中设置值时，此绑定仍然处于活动状态-因此ItemsSource始终指向DataContext，我认为它为空。

您有两个选择：从xaml中的DataGrid中删除ItemsSource绑定要么在后面的代码中设置DataContex而不是ItemsSource。

如何在单个datagridview中绑定四个表WPF LINQ

1 个答案: