Retrieves the details for the specified parent data item.
Syntax
Parameters
- parentCollectionView
- The parent DataGridCollectionView.
- parentItem
- The parent data item whose details are to be retrieved.
Return Value
An IEnumerable representing the details of the specified data item.
Example
All examples in this topic assume that the grid is bound to the
Employees table of a LINQ data context, unless stated otherwise.
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.
<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>
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
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 );
}
}
}
}
Requirements
Target Platforms: Windows 11, Windows, 10, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
See Also
