DataGridSortCommandEventHandler-Delegat
Stellt die Methode dar, die das SortCommand-Ereignis des DataGrid-Steuerelements behandelt.
Namespace: System.Web.UI.WebControls
Assembly: System.Web (in system.web.dll)
Syntax
'Declaration
Public Delegate Sub DataGridSortCommandEventHandler ( _
source As Object, _
e As DataGridSortCommandEventArgs _
)
'Usage
Dim instance As New DataGridSortCommandEventHandler(AddressOf HandlerMethod)
public delegate void DataGridSortCommandEventHandler (
Object source,
DataGridSortCommandEventArgs e
)
public delegate void DataGridSortCommandEventHandler (
Object^ source,
DataGridSortCommandEventArgs^ e
)
/** @delegate */
public delegate void DataGridSortCommandEventHandler (
Object source,
DataGridSortCommandEventArgs e
)
JScript unterstützt die Verwendung von Delegaten, aber nicht die Deklaration von neuen Delegaten.
Parameter
- source
Die Quelle des Ereignisses.
- e
Eine Instanz von DataGridSortCommandEventArgs, die die Ereignisdaten enthält.
Hinweise
Wenn durch Festlegen der AllowSorting-Eigenschaft des DataGrid-Steuerelements auf true die Sortierung aktiviert ist, werden die LinkButton-Steuerelemente in der Kopfzeile jeder Spalte wiedergegeben. Mit diesen Verknüpfungen können Sie das DataGrid-Steuerelement nach der ausgewählten Spalte sortieren. Das SortCommand-Ereignis wird durch Klicken auf das LinkButton-Steuerelement ausgelöst.
Beim Erstellen eines DataGridSortCommandEventHandler-Delegaten bestimmen Sie die Methode für die Ereignisbehandlung. Um das Ereignis dem Ereignishandler 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 Ereignisse und Delegaten.
Beispiel
Das folgende Codebeispiel veranschaulicht, wie für das SortCommand-Ereignis ein Handler zum Sortieren eines DataGrid-Steuerelements angegeben und codiert wird.
<%@ Page Language="VB" AutoEventWireup="True" %>
<%@ Import Namespace="System.Data" %>
<html>
<script runat="server">
Function CreateDataSource() As ICollection
' Create a Random object to mix up the order of items in the
' sample data.
Dim Rand_Num As Random = New Random()
' Create sample data for the DataGrid control.
Dim dt As DataTable = New DataTable()
Dim dr As DataRow
' Define the columns of the table.
dt.Columns.Add(new DataColumn("IntegerValue", GetType(Int32)))
dt.Columns.Add(new DataColumn("StringValue", GetType(String)))
dt.Columns.Add(new DataColumn("CurrencyValue", GetType(Double)))
' Populate the table with sample values.
Dim i As Integer
For i = 0 To 8
dr = dt.NewRow()
dr(0) = i
dr(1) = "Item " & Rand_Num.Next(1, 15).ToString()
dr(2) = 1.23 * Rand_Num.Next(1, 15)
dt.Rows.Add(dr)
Next i
' To persist the data source between posts to the server,
' store it in session state.
Session("Source") = dt
Dim dv As DataView = New DataView(dt)
Return dv
End Function
Sub Page_Load(sender As Object, e As EventArgs)
' Load sample data only once, when the page is first loaded.
If Not IsPostBack Then
ItemsGrid.DataSource = CreateDataSource()
ItemsGrid.DataBind()
End If
End Sub
Sub Sort_Grid(sender As Object, e As DataGridSortCommandEventArgs)
' Retrieve the data source from session state.
Dim dt As DataTable = CType(Session("Source"), DataTable)
' Create a DataView from the DataTable.
Dim dv As DataView = New DataView(dt)
' The DataView provides an easy way to sort. Simply set the
' Sort property with the name of the field to sort by.
dv.Sort = e.SortExpression
' Rebind the data source and specify that it should be sorted
' by the field specified in the SortExpression property.
ItemsGrid.DataSource = dv
ItemsGrid.DataBind()
End Sub
Sub Check_Change(sender As Object, e As EventArgs)
' Allow or prevent sorting depending on the user's selection.
If AllowSortingCheckBox.Checked Then
ItemsGrid.AllowSorting = True
Else
ItemsGrid.AllowSorting = False
End If
' After changing the property, rebind the data to
' refresh the DataGrid control.
' Retrieve the data source from session state.
Dim dt As DataTable = CType(Session("Source"), DataTable)
' Create a DataView from the DataTable.
Dim dv As DataView = New DataView(dt)
' Rebind the data source.
ItemsGrid.DataSource = dv
ItemsGrid.DataBind()
End Sub
</script>
<body>
<form runat=server>
<h3>DataGrid AllowSorting Example</h3>
Select whether to allow sorting in the DataGrid control.
<br><br>
<b>Product List</b>
<asp:DataGrid id="ItemsGrid"
BorderColor="black"
BorderWidth="1"
CellPadding="3"
OnSortCommand="Sort_Grid"
AutoGenerateColumns="False"
AllowSorting="True"
runat="server">
<HeaderStyle BackColor="#00aaaa">
</HeaderStyle>
<Columns>
<asp:BoundColumn DataField="IntegerValue"
SortExpression="IntegerValue"
HeaderText="Item"/>
<asp:BoundColumn DataField="StringValue"
SortExpression="StringValue"
HeaderText="Description"/>
<asp:BoundColumn DataField="CurrencyValue"
HeaderText="Price"
SortExpression="CurrencyValue"
DataFormatString="{0:c}">
<ItemStyle HorizontalAlign="Right">
</ItemStyle>
</asp:BoundColumn>
</Columns>
</asp:DataGrid>
<hr>
<asp:CheckBox id="AllowSortingCheckBox"
Text="Allow sorting"
AutoPostBack="True"
Checked="True"
OnCheckedChanged="Check_Change"
runat="server"/>
</form>
</body>
</html>
<%@ Page Language="C#" AutoEventWireup="True" %>
<%@ Import Namespace="System.Data" %>
<html>
<script runat="server">
ICollection CreateDataSource()
{
// Create a Random object to mix up the order of items in the
// sample data.
Random Rand_Num = new Random();
// Create sample data for the DataGrid control.
DataTable dt = new DataTable();
DataRow dr;
// Define the columns of the table.
dt.Columns.Add(new DataColumn("IntegerValue", typeof(Int32)));
dt.Columns.Add(new DataColumn("StringValue", typeof(String)));
dt.Columns.Add(new DataColumn("CurrencyValue", typeof(Double)));
// Populate the table with sample values.
for (int i=0; i<=8; i++)
{
dr = dt.NewRow();
dr[0] = i;
dr[1] = "Item " + Rand_Num.Next(1, 15).ToString();
dr[2] = 1.23 * Rand_Num.Next(1, 15);
dt.Rows.Add(dr);
}
// To persist the data source between posts to the server,
// store it in session state.
Session["Source"] = dt;
DataView dv = new DataView(dt);
return dv;
}
void Page_Load(Object sender, EventArgs e)
{
// Load sample data only once, when the page is first loaded.
if (!IsPostBack)
{
ItemsGrid.DataSource = CreateDataSource();
ItemsGrid.DataBind();
}
}
void Sort_Grid(Object sender, DataGridSortCommandEventArgs e)
{
// Retrieve the data source from session state.
DataTable dt = (DataTable)Session["Source"];
// Create a DataView from the DataTable.
DataView dv = new DataView(dt);
// The DataView provides an easy way to sort. Simply set the
// Sort property with the name of the field to sort by.
dv.Sort = e.SortExpression;
// Rebind the data source and specify that it should be sorted
// by the field specified in the SortExpression property.
ItemsGrid.DataSource = dv;
ItemsGrid.DataBind();
}
void Check_Change(Object sender, EventArgs e)
{
// Allow or prevent sorting depending on the user's selection.
if (AllowSortingCheckBox.Checked)
{
ItemsGrid.AllowSorting = true;
}
else
{
ItemsGrid.AllowSorting = false;
}
// After changing the property, rebind the data to
// refresh the DataGrid control.
// Retrieve the data source from session state.
DataTable dt = (DataTable)Session["Source"];
// Create a DataView from the DataTable.
DataView dv = new DataView(dt);
// Rebind the data source.
ItemsGrid.DataSource = dv;
ItemsGrid.DataBind();
}
</script>
<body>
<form runat=server>
<h3>DataGrid AllowSorting Example</h3>
Select whether to allow sorting in the DataGrid control.
<br><br>
<b>Product List</b>
<asp:DataGrid id="ItemsGrid"
BorderColor="black"
BorderWidth="1"
CellPadding="3"
OnSortCommand="Sort_Grid"
AutoGenerateColumns="False"
AllowSorting="True"
runat="server">
<HeaderStyle BackColor="#00aaaa">
</HeaderStyle>
<Columns>
<asp:BoundColumn DataField="IntegerValue"
SortExpression="IntegerValue"
HeaderText="Item"/>
<asp:BoundColumn DataField="StringValue"
SortExpression="StringValue"
HeaderText="Description"/>
<asp:BoundColumn DataField="CurrencyValue"
HeaderText="Price"
SortExpression="CurrencyValue"
DataFormatString="{0:c}">
<ItemStyle HorizontalAlign="Right">
</ItemStyle>
</asp:BoundColumn>
</Columns>
</asp:DataGrid>
<hr>
<asp:CheckBox id="AllowSortingCheckBox"
Text="Allow sorting"
AutoPostBack="True"
Checked="True"
OnCheckedChanged="Check_Change"
runat="server"/>
</form>
</body>
</html>
<%@ Page Language="VB" AutoEventWireup="True" %>
<%@ Import Namespace="System.Data" %>
<html>
<script runat="server">
Function CreateDataSource() As ICollection
' Create a Random object to mix up the order of items in the sample data.
Dim Rand_Num As Random = New Random()
' Create sample data for the DataGrid control.
Dim dt As DataTable = New DataTable()
Dim dr As DataRow
' Define the columns of the table.
dt.Columns.Add(new DataColumn("IntegerValue", GetType(Int32)))
dt.Columns.Add(new DataColumn("StringValue", GetType(String)))
dt.Columns.Add(new DataColumn("CurrencyValue", GetType(Double)))
' Populate the table with sample values.
Dim i As Integer
For i = 0 To 8
dr = dt.NewRow()
dr(0) = i
dr(1) = "Item " & Rand_Num.Next(1, 15).ToString()
dr(2) = 1.23 * Rand_Num.Next(1, 15)
dt.Rows.Add(dr)
Next i
' To persist the data source between posts to the server, store it
' in session state.
Session("Source") = dt
Dim dv As DataView = New DataView(dt)
Return dv
End Function
Sub Page_Load(sender As Object, e As EventArgs)
' Load sample data only once, when the page is first loaded.
If Not IsPostBack Then
ItemsGrid.DataSource = CreateDataSource()
ItemsGrid.DataBind()
End If
' Manually register the event-handling method for the PageIndexChanged
' event of the DataGrid control.
AddHandler ItemsGrid.SortCommand, AddressOf Sort_Grid
End Sub
Sub Sort_Grid(sender As Object, e As DataGridSortCommandEventArgs)
' Retrieve the data source from session state.
Dim dt As DataTable = CType(Session("Source"), DataTable)
' Create a DataView from the DataTable.
Dim dv As DataView = New DataView(dt)
' The DataView provides an easy way to sort. Simply set the Sort property with
' the name of the field to sort by.
dv.Sort = e.SortExpression
' Re-bind the data source and specify that it should be sorted
' by the field specified in the SortExpression property.
ItemsGrid.DataSource = dv
ItemsGrid.DataBind()
End Sub
Sub Check_Change(sender As Object, e As EventArgs)
' Allow or prevent sorting depending on the user's selection.
If AllowSortingCheckBox.Checked Then
ItemsGrid.AllowSorting = True
Else
ItemsGrid.AllowSorting = False
End If
' After changing the property, re-bind the data to
' refresh the DataGrid control.
' Retrieve the data source from session state.
Dim dt As DataTable = CType(Session("Source"), DataTable)
' Create a DataView from the DataTable.
Dim dv As DataView = New DataView(dt)
' Re-bind the data source.
ItemsGrid.DataSource = dv
ItemsGrid.DataBind()
End Sub
</script>
<body>
<form runat=server>
<h3>DataGrid SortCommand Example</h3>
Select whether to allow sorting in the DataGrid control.
<br><br>
<b>Product List</b>
<asp:DataGrid id="ItemsGrid"
BorderColor="black"
BorderWidth="1"
CellPadding="3"
AutoGenerateColumns="False"
AllowSorting="True"
runat="server">
<HeaderStyle BackColor="#00aaaa">
</HeaderStyle>
<Columns>
<asp:BoundColumn DataField="IntegerValue"
SortExpression="IntegerValue"
HeaderText="Item"/>
<asp:BoundColumn DataField="StringValue"
SortExpression="StringValue"
HeaderText="Description"/>
<asp:BoundColumn DataField="CurrencyValue"
HeaderText="Price"
SortExpression="CurrencyValue"
DataFormatString="{0:c}">
<ItemStyle HorizontalAlign="Right">
</ItemStyle>
</asp:BoundColumn>
</Columns>
</asp:DataGrid>
<hr>
<asp:CheckBox id="AllowSortingCheckBox"
Text="Allow sorting"
AutoPostBack="True"
Checked="True"
OnCheckedChanged="Check_Change"
runat="server"/>
</form>
</body>
</html>
<%@ Page Language="C#" AutoEventWireup="True" %>
<%@ Import Namespace="System.Data" %>
<html>
<script runat="server">
ICollection CreateDataSource()
{
// Create a Random object to mix up the order of items in the sample data.
Random Rand_Num = new Random();
// Create sample data for the DataGrid control.
DataTable dt = new DataTable();
DataRow dr;
// Define the columns of the table.
dt.Columns.Add(new DataColumn("IntegerValue", typeof(Int32)));
dt.Columns.Add(new DataColumn("StringValue", typeof(String)));
dt.Columns.Add(new DataColumn("CurrencyValue", typeof(Double)));
// Populate the table with sample values.
for (int i=0; i<=8; i++)
{
dr = dt.NewRow();
dr[0] = i;
dr[1] = "Item " + Rand_Num.Next(1, 15).ToString();
dr[2] = 1.23 * Rand_Num.Next(1, 15);
dt.Rows.Add(dr);
}
// To persist the data source between posts to the server, store it
// in session state.
Session["Source"] = dt;
DataView dv = new DataView(dt);
return dv;
}
void Page_Load(Object sender, EventArgs e)
{
// Load sample data only once, when the page is first loaded.
if (!IsPostBack)
{
ItemsGrid.DataSource = CreateDataSource();
ItemsGrid.DataBind();
}
// Manually register the event-handling method for the PageIndexChanged
// event of the DataGrid control.
ItemsGrid.SortCommand += new DataGridSortCommandEventHandler(this.Sort_Grid);
}
void Sort_Grid(Object sender, DataGridSortCommandEventArgs e)
{
// Retrieve the data source from session state.
DataTable dt = (DataTable)Session["Source"];
// Create a DataView from the DataTable.
DataView dv = new DataView(dt);
// The DataView provides an easy way to sort. Simply set the Sort property with
// the name of the field to sort by.
dv.Sort = e.SortExpression;
// Re-bind the data source and specify that it should be sorted
// by the field specified in the SortExpression property.
ItemsGrid.DataSource = dv;
ItemsGrid.DataBind();
}
void Check_Change(Object sender, EventArgs e)
{
// Allow or prevent sorting depending on the user's selection.
if (AllowSortingCheckBox.Checked)
{
ItemsGrid.AllowSorting = true;
}
else
{
ItemsGrid.AllowSorting = false;
}
// After changing the property, re-bind the data to
// refresh the DataGrid control.
// Retrieve the data source from session state.
DataTable dt = (DataTable)Session["Source"];
// Create a DataView from the DataTable.
DataView dv = new DataView(dt);
// Re-bind the data source.
ItemsGrid.DataSource = dv;
ItemsGrid.DataBind();
}
</script>
<body>
<form runat=server>
<h3>DataGrid SortCommand Example</h3>
Select whether to allow sorting in the DataGrid control.
<br><br>
<b>Product List</b>
<asp:DataGrid id="ItemsGrid"
BorderColor="black"
BorderWidth="1"
CellPadding="3"
AutoGenerateColumns="False"
AllowSorting="True"
runat="server">
<HeaderStyle BackColor="#00aaaa">
</HeaderStyle>
<Columns>
<asp:BoundColumn DataField="IntegerValue"
SortExpression="IntegerValue"
HeaderText="Item"/>
<asp:BoundColumn DataField="StringValue"
SortExpression="StringValue"
HeaderText="Description"/>
<asp:BoundColumn DataField="CurrencyValue"
HeaderText="Price"
SortExpression="CurrencyValue"
DataFormatString="{0:c}">
<ItemStyle HorizontalAlign="Right">
</ItemStyle>
</asp:BoundColumn>
</Columns>
</asp:DataGrid>
<hr>
<asp:CheckBox id="AllowSortingCheckBox"
Text="Allow sorting"
AutoPostBack="True"
Checked="True"
OnCheckedChanged="Check_Change"
runat="server"/>
</form>
</body>
</html>
Plattformen
Windows 98, Windows 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
.NET Framework unterstützt nicht alle Versionen sämtlicher Plattformen. Eine Liste der unterstützten Versionen finden Sie unter Systemanforderungen.
Versionsinformationen
.NET Framework
Unterstützt in: 2.0, 1.1, 1.0
Siehe auch
Referenz
System.Web.UI.WebControls-Namespace
DataGridSortCommandEventArgs-Klasse
DataGrid-Klasse
DataGrid.SortCommand-Ereignis