EntityDataSource.OrderBy Property

Definition

Namespace:

System.Web.UI.WebControls

Assembly:

System.Web.Entity.dll

Gets or sets the Entity SQL expression that specifies how to order the query results.

public:
 property System::String ^ OrderBy { System::String ^ get(); void set(System::String ^ value); };

public string OrderBy { get; set; }

member this.OrderBy : string with get, set

Public Property OrderBy As String

Property Value

String

The ORDER BY clause.

Examples

The XML markup in the following example, in an .aspx file, retrieves a value from a control and passes it as a parameter to the Where property.

<asp:EntityDataSource ID="SalesOrderHeader" runat="server"
  ConnectionString="name=AdventureWorksEntities"
  DefaultContainerName="AdventureWorksEntities" EnableDelete="True"
  EnableInsert="True" EnableUpdate="True" EntitySetName="SalesOrderHeader"
  EntityTypeFilter="" OrderBy="it.TotalDue DESC" Select=""
   Where="it.OnlineOrderFlag = TRUE AND it.TotalDue > @ordercost">
  <WhereParameters>
    <asp:ControlParameter ControlID="costLimit" DbType="Int32"
      DefaultValue="2500" Name="ordercost" PropertyName="Text" />
  </WhereParameters>
</asp:EntityDataSource>

The previous XML example is equivalent to the following ObjectQuery<T> named onlineOrders:

ObjectQuery<SalesOrderHeader> onlineOrders =
      context.SalesOrderHeader
       .Where("it.OnlineOrderFlag = TRUE AND it.TotalDue > @ordercost",
         new ObjectParameter("ordercost", orderCost))
        .OrderBy("it.TotalDue DESC");

Remarks

The OrderBy property of the EntityDataSource control is a string that represents an ORDER BY expression of an Entity SQL query. This string is passed, without modification, to an ObjectQuery<T> that is executed by the Entity Framework. This query is the source of the data regulated by the EntityDataSource control. The string supplied to the OrderBy property uses the same format as the string that is passed to the OrderBy method of ObjectQuery<T>. For examples of how to use the ORDER BY clause to order query results, see How to: Sort Data.