DataGridSortCommandEventArgs.CommandSource Propriété
Définition
Important
Certaines informations portent sur la préversion du produit qui est susceptible d’être en grande partie modifiée avant sa publication. Microsoft exclut toute garantie, expresse ou implicite, concernant les informations fournies ici.
Obtient la source de la commande.
public:
property System::Object ^ CommandSource { System::Object ^ get(); };
public object CommandSource { get; }
member this.CommandSource : obj
Public ReadOnly Property CommandSource As Object
Valeur de propriété
Source de la commande.
Exemples
L’exemple de code suivant montre comment utiliser la CommandSource propriété pour contrôler par programmation l’en-tête dans le DataGrid contrôle.
<%@ Page Language="C#" AutoEventWireup="True" %>
<%@ Import Namespace="System.Data" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
ICollection CreateDataSource()
{
// Create a Random object to mix up the
// order of items in the sample data.
Random randNum = new Random();
// Create sample data for the DataGrid control.
DataTable dt = new DataTable();
// 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++)
{
DataRow dr = dt.NewRow();
dr[0] = i;
dr[1] = "Item " + randNum.Next(1, 15).ToString();
dr[2] = 1.23 * randNum.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.
ItemsGrid.AllowSorting = AllowSortingCheckBox.Checked;
// 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>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>
ExtractTemplateRows Example
</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<h3>DataGrid AllowSorting Example</h3>
<p>Select whether to allow sorting in the DataGrid control.<br />
<asp:CheckBox id="AllowSortingCheckBox"
Text="Allow sorting"
AutoPostBack="True"
Checked="True"
OnCheckedChanged="Check_Change"
runat="server"/></p>
<hr />
<b>Product List</b>
<asp:DataGrid id="ItemsGrid"
BorderColor="black"
BorderWidth="1"
CellPadding="3"
OnSortCommand="Sort_Grid"
UseAccessibleHeader="true"
AutoGenerateColumns="False"
AllowSorting="True"
runat="server">
<HeaderStyle BackColor="#00aaaa" />
<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>
</div>
</form>
</body>
</html>
<%@ Page Language="VB" %>
<%@ Import Namespace="System.Data" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
Function CreateDataSource() As ICollection
' Create a Random object to mix up the order
' of items in the sample data.
Dim randNum As Random = New Random()
' Create sample data for the DataGrid control.
Dim dt As DataTable = New DataTable()
' 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
Dim dr As DataRow = dt.NewRow()
dr(0) = i
dr(1) = "Item " & randNum.Next(1, 15).ToString()
dr(2) = 1.23 * randNum.Next(1, 15)
dt.Rows.Add(dr)
Next
' Persist the data source between posts to
' the server, in the session state.
Session("Source") = dt
Dim dv As DataView = New DataView(dt)
Return dv
End Function
Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
' Load sample data when the page is first loaded.
If Not IsPostBack Then
ItemsGrid.DataSource = CreateDataSource()
ItemsGrid.DataBind()
End If
End Sub
Sub Sort_Grid(ByVal sender As Object, _
ByVal 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(ByVal sender As Object, _
ByVal e As EventArgs)
' Allow or prevent sorting depending
' on the user's selection.
ItemsGrid.AllowSorting = _
AllowSortingCheckBox.Checked
' After changing the property, rebind
' the data to refresh the DataGrid control.
' Retrieve 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>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>
ExtractTemplateRows Example
</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<h3>DataGrid AllowSorting Example</h3>
<p>Select whether to allow sorting in the DataGrid control.<br />
<asp:CheckBox id="AllowSortingCheckBox"
Text="Allow sorting"
AutoPostBack="True"
Checked="True"
OnCheckedChanged="Check_Change"
runat="server"/></p>
<hr />
<b>Product List</b>
<asp:DataGrid id="ItemsGrid"
BorderColor="black"
BorderWidth="1"
CellPadding="3"
OnSortCommand="Sort_Grid"
UseAccessibleHeader="true"
AutoGenerateColumns="False"
AllowSorting="True"
runat="server">
<HeaderStyle BackColor="#00aaaa" />
<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>
</div>
</form>
</body>
</html>
Remarques
Utilisez la CommandSource propriété pour obtenir la source de commande qui déclenche l’événement SortCommand . Étant donné que cet événement est déclenché uniquement lorsqu’un lien est cliqué dans l’en-tête du DataGrid contrôle, la source retournée est un DataGridItem objet qui représente l’en-tête. Cette propriété peut être utilisée pour contrôler l’en-tête par programmation.
S’applique à
Voir aussi
Commentaires
https://aka.ms/ContentUserFeedback.
Bientôt disponible : Tout au long de 2024, nous allons supprimer progressivement GitHub Issues comme mécanisme de commentaires pour le contenu et le remplacer par un nouveau système de commentaires. Pour plus d’informations, consultezEnvoyer et afficher des commentaires pour