GridViewSortEventHandler Delegat
Definition
Wichtig
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public delegate void GridViewSortEventHandler(System::Object ^ sender, GridViewSortEventArgs ^ e);public delegate void GridViewSortEventHandler(object sender, GridViewSortEventArgs e);type GridViewSortEventHandler = delegate of obj * GridViewSortEventArgs -> unitPublic Delegate Sub GridViewSortEventHandler(sender As Object, e As GridViewSortEventArgs)Parameter
- sender
- Object
Die Quelle des Ereignisses.
Ein GridViewSortEventArgs-Objekt, das die Ereignisdaten enthält.
Beispiele
Im folgenden Beispiel wird veranschaulicht, wie dem Ereignis eines Steuerelements programmgesteuert ein GridViewSortEventHandlerGridView Delegat Sorting hinzugefügt wird.
<%@ 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 Page_Load(Object sender, EventArgs e)
{
// Create a new GridView object.
GridView authorGridView = new GridView();
// Set the GridView object's properties.
authorGridView.ID = "AuthorGridView";
authorGridView.DataSourceID = "AuthorsSqlDataSource";
authorGridView.AutoGenerateColumns = true;
authorGridView.AllowSorting = true;
// Programmatically register the event-handling methods.
authorGridView.Sorting += new GridViewSortEventHandler(this.AuthorsGridView_Sorting);
// Add the GridView object to the Controls collection
// of the PlaceHolder control.
GridViewPlaceHolder.Controls.Add(authorGridView);
}
void AuthorsGridView_Sorting(Object sender, GridViewSortEventArgs e)
{
// Cancel the sorting operation if the user attempts to sort
// the Contract column.
if(e.SortExpression == "contract")
{
e.Cancel = true;
Message.Text = "You cannot sort the Contract column.";
}
else
{
// Clear the message label.
Message.Text = "";
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>GridViewSortEventHandler Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>GridViewSortEventHandler Example</h3>
<asp:label id="Message"
forecolor="Red"
runat="server"/>
<br/>
<asp:placeholder id="GridViewPlaceHolder"
runat="Server"/>
<!-- This example uses Microsoft SQL Server and connects -->
<!-- to the Pubs sample database. -->
<asp:sqldatasource id="AuthorsSqlDataSource"
selectcommand="SELECT [au_id], [au_lname], [au_fname], [address], [city], [state], [zip], [contract] FROM [authors]"
updatecommand="UPDATE authors SET au_lname=@au_lname, au_fname=@au_fname, address=@address, city=@city, state=@state, zip=@zip, contract=@contract WHERE (authors.au_id = @au_id)"
connectionstring="server=localhost;database=pubs;integrated security=SSPI"
runat="server">
</asp:sqldatasource>
</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 Page_Load(ByVal sender As Object, ByVal e As EventArgs)
' Create a new GridView object.
Dim authorGridView As GridView = New GridView
' Set the GridView object's properties.
authorGridView.ID = "AuthorGridView"
authorGridView.DataSourceID = "AuthorsSqlDataSource"
authorGridView.AutoGenerateColumns = True
authorGridView.AllowSorting = True
' Programmatically register the event-handling methods.
AddHandler authorGridView.Sorting, AddressOf AuthorsGridView_Sorting
' Add the GridView object to the Controls collection
' of the PlaceHolder control.
GridViewPlaceHolder.Controls.Add(authorGridView)
End Sub
Sub AuthorsGridView_Sorting(ByVal sender As Object, ByVal e As GridViewSortEventArgs)
' Cancel the sorting operation if the user attempts to sort
' the Contract column.
If e.SortExpression = "contract" Then
e.Cancel = True
Message.Text = "You cannot sort the Contract column."
Else
' Clear the message label.
Message.Text = ""
End If
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>GridViewSortEventHandler Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>GridViewSortEventHandler Example</h3>
<asp:label id="Message"
forecolor="Red"
runat="server"/>
<br/>
<asp:placeholder id="GridViewPlaceHolder"
runat="Server"/>
<!-- This example uses Microsoft SQL Server and connects -->
<!-- to the Pubs sample database. -->
<asp:sqldatasource id="AuthorsSqlDataSource"
selectcommand="SELECT [au_id], [au_lname], [au_fname], [address], [city], [state], [zip], [contract] FROM [authors]"
updatecommand="UPDATE authors SET au_lname=@au_lname, au_fname=@au_fname, address=@address, city=@city, state=@state, zip=@zip, contract=@contract WHERE (authors.au_id = @au_id)"
connectionstring="server=localhost;database=pubs;integrated security=SSPI"
runat="server">
</asp:sqldatasource>
</form>
</body>
</html>
Im folgenden Beispiel wird veranschaulicht, wie dem Ereignis eines Steuerelements deklarativ ein GridViewSortEventHandlerGridView Delegat Sorting hinzugefügt wird.
<%@ 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>
Hinweise
Das Sorting Ereignis wird ausgelöst, wenn auf den Link zum Sortieren einer Spalte geklickt wird, aber bevor das GridView Steuerelement den Sortiervorgang verarbeitet. Auf diese Weise können Sie eine Ereignisbehandlungsmethode bereitstellen, die eine benutzerdefinierte Routine ausführt, z. B. das Abbrechen des Sortiervorgangs, wenn dieses Ereignis auftritt.
Beim Erstellen eines GridViewSortEventHandler-Delegaten bestimmen Sie die Methode für die Ereignisbehandlung. Um dem Ereignishandler das Ereignis zuzuordnen, fügen Sie dem Ereignis eine Instanz des Delegaten hinzu. Der Ereignishandler wird bei jedem Eintreten des Ereignisses aufgerufen, sofern der Delegat nicht entfernt wird. Weitere Informationen zu Ereignishandlerdelegaten finden Sie unter Behandeln und Auslösen von Ereignissen.
Erweiterungsmethoden
| GetMethodInfo(Delegate) |
Ruft ein Objekt ab, das die Methode darstellt, die vom angegebenen Delegaten dargestellt wird. |
Gilt für:
Weitere Informationen
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