GridViewSortEventArgs.SortExpression Property
Definition
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 expression used to sort the items in the GridView control.
public:
property System::String ^ SortExpression { System::String ^ get(); void set(System::String ^ value); };
public string SortExpression { get; set; }
member this.SortExpression : string with get, set
Public Property SortExpression As String
Property Value
The expression used to sort the items in the GridView control.
Examples
The following example demonstrates how to use the SortExpression property to determine which column in a GridView control is being sorted. If the user attempts to sort the address column, 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)
{
// Cancel the sorting operation if the user attempts
// to sort by address.
if (e.SortExpression == "Address")
{
e.Cancel = true;
Message.Text = "You cannot sort by address.";
SortInformationLabel.Text = "";
}
else
{
Message.Text = "";
}
}
void CustomersGridView_Sorted(Object sender, EventArgs e)
{
// Display the sort expression and sort direction.
SortInformationLabel.Text = "Sorting by " +
CustomersGridView.SortExpression.ToString() +
" in " + CustomersGridView.SortDirection.ToString() +
" order.";
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>GridView Sorting Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>GridView Sorting Example</h3>
<asp:label id="Message"
forecolor="Red"
runat="server"/>
<br/>
<asp:label id="SortInformationLabel"
forecolor="Navy"
runat="server"/>
<br/>
<asp:gridview id="CustomersGridView"
datasourceid="CustomersSource"
autogeneratecolumns="true"
allowpaging="true"
emptydatatext="No data available."
allowsorting="true"
onsorting="CustomersGridView_Sorting"
onsorted="CustomersGridView_Sorted"
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(sender As Object, e As GridViewSortEventArgs)
' Cancel the sorting operation if the user attempts
' to sort by address.
If e.SortExpression = "Address" Then
e.Cancel = True
Message.Text = "You cannot sort by address."
SortInformationLabel.Text = ""
Else
Message.Text = ""
End If
End Sub
Sub CustomersGridView_Sorted(ByVal sender As Object, ByVal e As EventArgs)
' Display the sort expression and sort direction.
SortInformationLabel.Text = "Sorting by " & _
CustomersGridView.SortExpression.ToString() & _
" in " & CustomersGridView.SortDirection.ToString() & _
" order."
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>GridView Sorted and Sorting Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>GridView Sorted and Sorting Example</h3>
<asp:label id="Message"
forecolor="Red"
runat="server"/>
<br/>
<asp:label id="SortInformationLabel"
forecolor="Navy"
runat="server"/>
<br/>
<asp:gridview id="CustomersGridView"
datasourceid="CustomersSource"
autogeneratecolumns="true"
allowpaging="true"
emptydatatext="No data available."
allowsorting="true"
onsorting="CustomersGridView_Sorting"
onsorted="CustomersGridView_Sorted"
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 SortExpression property to determine the sort expression that will be used to sort the GridView control when sort operation is performed. By default, the GridView control sorts a single column at a time. The sort expression simply contains the name of the field to sort. You can also sort multiple columns at a time by programmatically setting this property to a comma-separated list of field names.
Applies to
See also
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