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从17.2开始，您可以使用DetailDescriptorSelector为主行选择不同的详细信息。 您可以在如何根据GridControl的主行中的数据使用不同的详细信息中找到示例项目。

DetailDescriptorSelector Class

使您可以选择要在数据相关详细信息中使用的详细信息描述符。

Syntax

public class DetailDescriptorSelector : MultiDetailDescriptorBase

Public Class DetailDescriptorSelector Inherits MultiDetailDescriptorBase

Remarks

GridControl允许您通过以下方式在XAML中定义一个简单的详细信息选择逻辑（使用DetailDescriptorSelector对象）：

1. 将DetailDescriptorSelector对象传递给GridControl.DetailDescriptor属性。
   

   <dxg:GridControl ItemsSource="{x:Static local:ViewModel.Employees}">
       <dxg:GridControl.DetailDescriptor>
           <dxg:DetailDescriptorSelector>
               <!-- DetailDescriptorSelector -->
           </dxg:DetailDescriptorSelector>
       </dxg:GridControl.DetailDescriptor>
   </dxg:GridControl>

2. 当满足相应的触发条件时，DetailDescriptorSelector选择详细描述符。
   
   下面的代码示例演示了如何提供为满足特定条件的主行选择的详细描述符（在此示例中为Employees.Count == 0）。
   

   <dxg:GridControl ItemsSource="{x:Static local:ViewModel.Employees}">
       <dxg:GridControl.DetailDescriptor>
           <dxg:DetailDescriptorSelector>
               <!-- A detail descriptor selected for master rows, whose Employees.Count value is equal to 0 -->
               <dxg:DetailDescriptorTrigger Binding="{Binding Path=Employees.Count}" Value="0">
                   <dxg:DataControlDetailDescriptor ItemsSourcePath="Customers">
                       <dxg:GridControl>
                           <!-- The detail GridControl settings -->
                       </dxg:GridControl>
                   </dxg:DataControlDetailDescriptor>
               </dxg:DetailDescriptorTrigger>
           </dxg:DetailDescriptorSelector>
       </dxg:GridControl.DetailDescriptor>
       <!-- The master GridControl settings -->
   </dxg:GridControl>

3. 要提供默认详细信息描述符，请将带有已配置详细信息GridControl的DetailDescriptorSelector传递给DefaultValue属性。
   

   <dxg:GridControl ItemsSource="{x:Static local:ViewModel.Employees}">
       <dxg:GridControl.DetailDescriptor>
           <dxg:DetailDescriptorSelector>
   
               <!-- The default detail descriptor -->
               <dxg:DetailDescriptorSelector.DefaultValue>
                   <dxg:DataControlDetailDescriptor ItemsSourcePath="Employees">
                       <dxg:GridControl>
                           <!-- The default detail GridControl settings -->
                       </dxg:GridControl>
                   </dxg:DataControlDetailDescriptor>
               </dxg:DetailDescriptorSelector.DefaultValue>            
   
               <!-- A detail descriptor selected for master rows, whose Employees.Count value is equal to 0 -->
               <dxg:DetailDescriptorTrigger Binding="{Binding Path=Employees.Count}" Value="0">
                   <dxg:DataControlDetailDescriptor ItemsSourcePath="Customers">
                       <dxg:GridControl>
                           <!-- The detail GridControl settings -->
                       </dxg:GridControl>
                   </dxg:DataControlDetailDescriptor>
               </dxg:DetailDescriptorTrigger>
   
           </dxg:DetailDescriptorSelector>
       </dxg:GridControl.DetailDescriptor>
       <!-- The master GridControl settings -->
   </dxg:GridControl>

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