【问题标题】:how to bind four tables in single datagridview wpf linq如何在单个datagridview wpf linq中绑定四个表
【发布时间】:2019-10-23 01:37:56
【问题描述】:

我有一个 datagridview,我想将它与连接的四个表绑定 彼此和照片解释了关系 relations of four tables

我尝试将它与 wpf 绑定,但我不能
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>

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

【问题讨论】:

    标签: c# wpf linq


    【解决方案1】:

    通过设置 ItemsSource={Binding},您将其绑定到 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,我假设它是空的。

    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。

    【讨论】:

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