GridViewSortEventArgs.SortDirection Property

Reference

Definition

Namespace:: System.Web.UI.WebControls

Assembly:: System.Web.dll

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Gets or sets the direction in which to sort the GridView control.

public:
 property System::Web::UI::WebControls::SortDirection SortDirection { System::Web::UI::WebControls::SortDirection get(); void set(System::Web::UI::WebControls::SortDirection value); };

public System.Web.UI.WebControls.SortDirection SortDirection { get; set; }

member this.SortDirection : System.Web.UI.WebControls.SortDirection with get, set

Public Property SortDirection As SortDirection

Property Value

SortDirection

One of the SortDirection values.

Examples

The following example demonstrates how to use the SortDirection property to determine the direction in which to sort a GridView control. If the user attempts to sort in descending order, the sort operation is canceled.


<%@ Page language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
  
  void CustomersGridView_Sorting(Object sender, GridViewSortEventArgs e)
  {
    // By default, the sort order toggles when the user clicks 
    // the same sort button repeatedly. For this example, cancel
    // the sort operation if the user attempts to sort in descending
    // order.
    if (e.SortDirection == SortDirection.Descending)
    {
      e.Cancel = true;
      Message.Text = "Sorting in descending order is not supported.";
    }
    else
    {
      Message.Text = "";
    }
  }
  
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>GridViewSortEventArgs SortDirection Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>GridViewSortEventArgs SortDirection Example</h3>

      <asp:label id="Message"
        forecolor="Red"
        runat="server"/>
                
      <br/>  

      <asp:gridview id="CustomersGridView" 
        datasourceid="CustomersSource" 
        autogeneratecolumns="true"
        allowpaging="true"
        emptydatatext="No data available." 
        allowsorting="true"
        onsorting="CustomersGridView_Sorting"
        runat="server">
                
      </asp:gridview>
            
      <!-- This example uses Microsoft SQL Server and connects  -->
      <!-- to the Northwind sample database. Use an ASP.NET     -->
      <!-- expression to retrieve the connection string value   -->
      <!-- from the Web.config file.                            -->
      <asp:sqldatasource id="CustomersSource"
        selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]"
        connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>" 
        runat="server"/>
        
    </form>
  </body>
</html>


<%@ Page language="VB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
  
  Sub CustomersGridView_Sorting(ByVal sender As Object, ByVal e As GridViewSortEventArgs)
  
    ' By default, the sort order toggles when the user clicks 
    ' the same sort button repeatedly. For this example, cancel
    ' the sort operation if the user attempts to sort in descending
    ' order.
    If e.SortDirection = SortDirection.Descending Then
    
      e.Cancel = True
      Message.Text = "Sorting in descending order is not supported."
    
    Else
    
      Message.Text = ""
    
    End If
      
  End Sub
  
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>GridViewSortEventArgs SortDirection Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>GridViewSortEventArgs SortDirection Example</h3>

      <asp:label id="Message"
        forecolor="Red"
        runat="server"/>
                
      <br/>  

      <asp:gridview id="CustomersGridView" 
        datasourceid="CustomersSource" 
        autogeneratecolumns="true"
        allowpaging="true"
        emptydatatext="No data available." 
        allowsorting="true"
        onsorting="CustomersGridView_Sorting"
        runat="server">
                
      </asp:gridview>
            
      <!-- This example uses Microsoft SQL Server and connects  -->
      <!-- to the Northwind sample database. Use an ASP.NET     -->
      <!-- expression to retrieve the connection string value   -->
      <!-- from the Web.config file.                            -->
      <asp:sqldatasource id="CustomersSource"
        selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]"
        connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>" 
        runat="server"/>
        
    </form>
  </body>
</html>

Remarks

When the Sorting event is raised, you can use the SortDirection property to determine the order in which the GridView control will sort its items (based on the sort expression) when the sort operation is performed. Because the Sorting event occurs before the sort operation, you can also use the SortDirection property to programmatically set the sort direction.

Applies to

Dela via