RadGrid - Declarative Relations.

[Taras]

I've seen example. 
But I can't realize binding hierarchy.
I've one table ID, ParentID (see attached image)
There is my grid.

<MasterTableView DataSourceID="dsMain" DataKeyNames="ID, ParentID" AllowSorting="True" HierarchyLoadMode="ServerBind" GroupLoadMode="Server">

<DetailTables>

<telerik:GridTableView DataSourceID="dsSub" DataKeyNames="ID, ParentID" Width="100%" AutoGenerateColumns="True"  >

 <ParentTableRelation>

  <telerik:GridRelationFields DetailKeyField="ID" MasterKeyField="ID">

  </telerik:GridRelationFields>

</ParentTableRelation>

 </telerik:GridTableView>

                     

</DetailTables>


My object data source

<asp:ObjectDataSource id="dsMain" runat="server" selectmethod="GetRootCategories" deletemethod="DeleteCategory"
      typename="Ascent.Catalog.Model.DataModel.Categories">
     <deleteparameters>
         <asp:Parameter Name="ID" Type="Int32"/>
     </deleteparameters>
 </asp:ObjectDataSource>

<asp:ObjectDataSource id="dsSub" runat="server" selectmethod="GetSubCategoriesByParentCategoryId" deletemethod="DeleteCategory"
      typename="Ascent.Catalog.Model.DataModel.Categories">
    <deleteparameters>
              <asp:Parameter Name="ID" Type="Int32"/>
    </deleteparameters>

    <SelectParameters>
    <asp:SessionParameter Name="pID" SessionField="ID" Type="Int32"></asp:SessionParameter>
    </SelectParameters>

 </asp:ObjectDataSource>

Each time when "GetSubCategoriesByParentCategoryId" is called  ID = 0.

What am i doing wrong?

[Andrey]

Hello,

I am not sure what is the problem you are experiencing. However, looking through your data I see you have self-referencing hierarchy in your code. RadGrid no longer support such kind of functionality but you could RadTreeList control which is designed for that purpose. In this case you will need to pass only one datasource to the control and it will build the hierarchy for you. Check this online demo application which illustrates the usage of the control.

Regards,
Andrey
Telerik