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Xceed DataGrid for WPF v7.3 Documentation
Welcome to Xceed DataGrid, Editors, and 3D Views for WPF v7.3 / Xceed DataGrid for WPF / Code Snippets / Creating a Custom Detail Description

In This Topic
    Creating a Custom Detail Description
    In This Topic

    The following example demonstrates how to create and use a custom detail description that handles LINQ detail relations, which are provided by properties to which the AssociationAttribute is applied.

    VB.NET
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    Imports System
Imports System.Collections.Generic
Imports System.Linq
Imports System.Text
Imports Xceed.Wpf.DataGrid
Imports System.Reflection
Imports System.Data.Linq.Mapping
Imports System.Diagnostics
Imports System.Collections
Namespace Xceed.Wpf.Documentation
  Public Class LinqToSqlDetailDescription
               Inherits DataGridDetailDescription
    Protected Overrides Function GetDetailsForParentItem( ByVal parentCollectionView As DataGridCollectionView, _
                                                          ByVal parentItem As Object ) As IEnumerable
      Dim parentItemType As Type = parentItem.GetType()
      Dim foundProperty As PropertyInfo = Nothing
      Dim properties() As PropertyInfo = parentItemType.GetProperties()
      Dim propertyInfo As PropertyInfo
      For Each propertyInfo In properties
        Dim attributes() As Object = propertyInfo.GetCustomAttributes( Type.GetType( AssociationAttribute ), _
                                                                        False)
        If attributes.GetLength( 0 ) = 0 Then
          continue
        End If
        Dim associationAttribute As AssociationAttribute = CType( attributes( 0 ), AssociationAttribute )
        If associationAttribute.Name = Me.RelationName Then
          foundProperty = propertyInfo
          Exit Property
        End If
      Next
      If foundProperty Is Nothing Then
        Return New Object()
      Else
        Dim details As Object = foundProperty.GetValue( parentItem, Nothing )
        Dim detailsType As Type = details.GetType()
        Dim getNewBindingList As MethodInfo = detailsType.GetMethod( "GetNewBindingList" )
        Return CType( getNewBindingList.Invoke( details, Nothing), IEnumerable )
      End If
    End Function
  End Class
End Namespace
    C#
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    using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Xceed.Wpf.DataGrid;
using System.Reflection;
using System.Data.Linq.Mapping;
using System.Diagnostics;
using System.Collections;
namespace Xceed.Wpf.Documentation
{
 public class LinqToSqlDetailDescription: DataGridDetailDescription
 {
   protected override IEnumerable GetDetailsForParentItem( DataGridCollectionView parentCollectionView,
                                                           object parentItem )
   {
     Type parentItemType = parentItem.GetType();
     PropertyInfo foundProperty = null;
    
     PropertyInfo[] properties = parentItemType.GetProperties();
     foreach( PropertyInfo propertyInfo in properties )
     {
       object[] attributes = propertyInfo.GetCustomAttributes( typeof( AssociationAttribute ), false );
       if( attributes.GetLength( 0 ) == 0 )
         continue;
       AssociationAttribute associationAttribute = ( AssociationAttribute )attributes[ 0 ];
       if( associationAttribute.Name == this.RelationName )
       {
         foundProperty = propertyInfo;
         break;
       }
     }
     if( foundProperty == null )
     {
       return new object[] { };
     }
     else
     {
       object details = foundProperty.GetValue( parentItem, null );
       Type detailsType = details.GetType();
       MethodInfo getNewBindingList = detailsType.GetMethod( "GetNewBindingList" );
       return ( IEnumerable )getNewBindingList.Invoke( details, null );
     }
   }
 }
}
    XAML
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    <Grid>
  <Grid.Resources>
    <xcdg:DataGridCollectionViewSource x:Key="cvs_employees"
                                       Source="{Binding Source={x:Static Application.Current},
                                                        Path=LinqDataContext.Employees}">
       <xcdg:DataGridCollectionViewSource.DetailDescriptions>
          <local:LinqToSqlDetailDescription RelationName="Employee_Employees"
                                            Title="Employees" />
          <local:LinqToSqlDetailDescription RelationName="Employee_Customer"
                                            Title="Customers">
             <local:LinqToSqlDetailDescription.DetailDescriptions>
                <local:LinqToSqlDetailDescription RelationName="Customer_Order"
                                                  Title="Orders">
                   <local:LinqToSqlDetailDescription.DetailDescriptions>
                      <local:LinqToSqlDetailDescription RelationName="Order_Order_Detail"
                                                        Title="Order Details" />
                   </local:LinqToSqlDetailDescription.DetailDescriptions>
                </local:LinqToSqlDetailDescription>
             </local:LinqToSqlDetailDescription.DetailDescriptions>
          </local:LinqToSqlDetailDescription>
       </xcdg:DataGridCollectionViewSource.DetailDescriptions>
    </xcdg:DataGridCollectionViewSource>
  </Grid.Resources>
 
  <xcdg:DataGridControl x:Name="EmployeesGrid"
                      ItemsSource="{Binding Source={StaticResource cvs_employees}}"
                      ItemsSourceName="Employee Information"
                      AutoCreateDetailConfigurations="True" />
</Grid>
    VB.NET
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    Dim context As New NorthwindDataContext()
Dim collectionView As New DataGridCollectionView( context.Employees, GetType( Employee ), True, False )
collectionView.DetailDescriptions.Add( New LinqToSqlDetailDescription( "Employee_Employees", "Employees" ) )
Dim employeeCustomerDetail As New LinqToSqlDetailDescription( "Employee_Customer", "Customers" )
Dim customerOrderDetail As New LinqToSqlDetailDescription( "Customer_Order", "Orders" )
customerOrderDetail.DetailDescriptions.Add( New LinqToSqlDetailDescription( "Order_Order_Detail", "Order Details" ) )
employeeCustomerDetail.DetailDescriptions.Add( customerOrderDetail )
collectionView.DetailDescriptions.Add( employeeCustomerDetail )
dataGridControl.AutoCreateDetailConfigurations = True
dataGridControl.ItemsSourceName = "Employee Information"
dataGridControl.ItemsSource = collectionView
    C#
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    NorthwindDataContext context = new NorthwindDataContext();      
DataGridCollectionView collectionView = new DataGridCollectionView( context.Employees, typeof( Employee ), true, false );      
collectionView.DetailDescriptions.Add( new LinqToSqlDetailDescription( "Employee_Employees", "Employees" ) );
LinqToSqlDetailDescription employeeCustomerDetail = new LinqToSqlDetailDescription( "Employee_Customer", "Customers" );
LinqToSqlDetailDescription customerOrderDetail = new LinqToSqlDetailDescription( "Customer_Order", "Orders" );
customerOrderDetail.DetailDescriptions.Add( new LinqToSqlDetailDescription( "Order_Order_Detail", "Order Details" ) );
employeeCustomerDetail.DetailDescriptions.Add( customerOrderDetail );
collectionView.DetailDescriptions.Add( employeeCustomerDetail );
dataGridControl.AutoCreateDetailConfigurations = true;
dataGridControl.ItemsSourceName = "Employee Information";
dataGridControl.ItemsSource = collectionView;

     

     

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