TemplateColumn.ItemTemplate Eigenschaft
Definition
Wichtig
Einige Informationen beziehen sich auf Vorabversionen, die vor dem Release ggf. grundlegend überarbeitet werden. Microsoft übernimmt hinsichtlich der hier bereitgestellten Informationen keine Gewährleistungen, seien sie ausdrücklich oder konkludent.
Ruft die Vorlage zum Anzeigen eines Datenelements in einer TemplateColumn ab oder legt diese fest.
public:
virtual property System::Web::UI::ITemplate ^ ItemTemplate { System::Web::UI::ITemplate ^ get(); void set(System::Web::UI::ITemplate ^ value); };[System.ComponentModel.Browsable(false)]
[System.Web.UI.PersistenceMode(System.Web.UI.PersistenceMode.InnerProperty)]
[System.Web.UI.TemplateContainer(typeof(System.Web.UI.WebControls.DataGridItem))]
public virtual System.Web.UI.ITemplate ItemTemplate { get; set; }[<System.ComponentModel.Browsable(false)>]
[<System.Web.UI.PersistenceMode(System.Web.UI.PersistenceMode.InnerProperty)>]
[<System.Web.UI.TemplateContainer(typeof(System.Web.UI.WebControls.DataGridItem))>]
member this.ItemTemplate : System.Web.UI.ITemplate with get, setPublic Overridable Property ItemTemplate As ITemplateEigenschaftswert
Ein implementiertes ITemplate-Objekt, das die Vorlage zum Anzeigen eines Datenelements in der TemplateColumn enthält. Der Standardwert ist null und gibt an, dass diese Eigenschaft nicht festgelegt ist.
- Attribute
Beispiele
Im folgenden Codebeispiel wird veranschaulicht, wie die ItemTemplate Eigenschaft zum Steuern der Darstellung eines Datenelements im TemplateColumn Objekt verwendet wird.
<%@ 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">
<html xmlns="http://www.w3.org/1999/xhtml" >
<script runat="server">
DataTable Store = new DataTable();
DataView StoreView;
void Page_Load(Object sender, EventArgs e)
{
if(Session["StoreData"] == null)
{
DataRow dr;
Store = new DataTable();
Store.Columns.Add(new DataColumn("Tax", typeof(String)));
Store.Columns.Add(new DataColumn("Item", typeof(String)));
Store.Columns.Add(new DataColumn("Price", typeof(String)));
Session["StoreData"] = Store;
// Create sample data.
for (int i = 1; i <= 4; i++)
{
dr = Store.NewRow();
dr[0] = "0.0%";
dr[1] = "Item " + i.ToString();
dr[2] = (1.23 * (i + 1)).ToString();
Store.Rows.Add(dr);
}
}
else
Store = (DataTable)Session["StoreData"];
StoreView = new DataView(Store);
StoreView.Sort="Item";
if(!IsPostBack)
BindGrid();
}
void MyDataGrid_Edit(Object sender, DataGridCommandEventArgs e)
{
MyDataGrid.EditItemIndex = e.Item.ItemIndex;
BindGrid();
}
void MyDataGrid_Cancel(Object sender, DataGridCommandEventArgs e)
{
MyDataGrid.EditItemIndex = -1;
BindGrid();
}
void MyDataGrid_Update(Object sender, DataGridCommandEventArgs e)
{
// Get the text box that contains the price to edit.
// For bound columns the edited value is stored in a text box.
// The text box is the first control in the Controls collection.
TextBox priceText = (TextBox)e.Item.Cells[3].Controls[0];
// Get the check box that indicates whether to include tax from the
// TemplateColumn. Notice that in this case, the check box control is
// second control in the Controls collection.
CheckBox taxCheck = (CheckBox)e.Item.Cells[2].Controls[1];
String item = e.Item.Cells[1].Text;
String price = priceText.Text;
DataRow dr;
// With a database, use an update command. Since the data source is
// an in-memory DataTable, delete the old row and replace it with a new one.
// Remove old entry.
StoreView.RowFilter = "Item='" + item + "'";
if (StoreView.Count > 0)
StoreView.Delete(0);
StoreView.RowFilter = "";
// Add new entry.
dr = Store.NewRow();
if (taxCheck.Checked)
dr[0] = "8.6%";
else
dr[0] = "0.0%";
dr[1] = item;
dr[2] = price;
Store.Rows.Add(dr);
MyDataGrid.EditItemIndex = -1;
BindGrid();
}
void BindGrid()
{
MyDataGrid.DataSource = StoreView;
MyDataGrid.DataBind();
}
</script>
<head runat="server">
<title>TemplateColumn Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>TemplateColumn Example</h3>
<asp:DataGrid id="MyDataGrid" runat="server"
BorderColor="black"
CellPadding="2"
OnEditCommand="MyDataGrid_Edit"
OnCancelCommand="MyDataGrid_Cancel"
OnUpdateCommand="MyDataGrid_Update"
ShowFooter="True"
AutoGenerateColumns="false">
<Columns>
<asp:EditCommandColumn
EditText="Edit"
CancelText="Cancel"
UpdateText="Update"
ItemStyle-Wrap="false"
HeaderText="Edit Controls"/>
<asp:BoundColumn HeaderText="Description"
ReadOnly="true"
DataField="Item"/>
<asp:TemplateColumn>
<HeaderTemplate>
<b> Tax </b>
</HeaderTemplate>
<ItemTemplate>
<asp:Label
Text='<%# DataBinder.Eval(Container.DataItem, "Tax") %>'
runat="server"/>
</ItemTemplate>
<EditItemTemplate>
<asp:CheckBox
Text="Taxable"
runat="server"/>
</EditItemTemplate>
<FooterTemplate>
<asp:HyperLink id="HyperLink1"
Text="Microsoft"
NavigateUrl="http://www.microsoft.com"
runat="server"/>
</FooterTemplate>
</asp:TemplateColumn>
<asp:BoundColumn HeaderText="Price"
DataField="Price"/>
</Columns>
</asp:DataGrid>
</form>
</body>
</html>
<%@ Page Language="VB" 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">
<html xmlns="http://www.w3.org/1999/xhtml" >
<script runat="server">
Private Store As DataTable = New DataTable()
Private StoreView As DataView
Sub Page_Load(sender As Object, e As EventArgs)
If IsNothing(Session("StoreData")) Then
Dim dr As DataRow
Dim i As Integer
Store = New DataTable()
Store.Columns.Add(New DataColumn("Tax", GetType(String)))
Store.Columns.Add(New DataColumn("Item", GetType(String)))
Store.Columns.Add(New DataColumn("Price", GetType(String)))
Session("StoreData") = Store
' Create sample data.
For i = 1 to 4
dr = Store.NewRow()
dr(0) = "0.0%"
dr(1) = "Item " & i.ToString()
dr(2) = (1.23 * (i + 1)).ToString()
Store.Rows.Add(dr)
Next i
Else
Store = Session("StoreData")
End If
StoreView = New DataView(Store)
StoreView.Sort="Item"
If Not IsPostBack Then
BindGrid()
End If
End Sub
Sub MyDataGrid_Edit(sender As Object, e As DataGridCommandEventArgs)
MyDataGrid.EditItemIndex = e.Item.ItemIndex
BindGrid()
End Sub
Sub MyDataGrid_Cancel(sender As Object, e As DataGridCommandEventArgs)
MyDataGrid.EditItemIndex = -1
BindGrid()
End Sub
Sub MyDataGrid_Update(sender As Object, e As DataGridCommandEventArgs)
' Get the text box that contains the price to edit.
' For bound columns the edited value is stored in a text box.
' The text box is the first control in the Controls collection.
Dim priceText As TextBox = e.Item.Cells(3).Controls(0)
' Get the check box that indicates whether to include tax from the
' TemplateColumn. Notice that in this case, the check box control is
' second control in the Controls collection.
Dim taxCheck As CheckBox = e.Item.Cells(2).Controls(1)
Dim item As String = e.Item.Cells(1).Text
Dim price As String = priceText.Text
Dim dr As DataRow
' With a database, use an update command. Since the data source is
' an in-memory DataTable, delete the old row and replace it with a new one.
' Remove old entry.
StoreView.RowFilter = "Item='" & item & "'"
If StoreView.Count > 0 Then
StoreView.Delete(0)
End If
StoreView.RowFilter = ""
' Add new entry.
dr = Store.NewRow()
If taxCheck.Checked Then
dr(0) = "8.6%"
Else
dr(0) = "0.0%"
End If
dr(1) = item
dr(2) = price
Store.Rows.Add(dr)
MyDataGrid.EditItemIndex = -1
BindGrid()
End Sub
Sub BindGrid()
MyDataGrid.DataSource = StoreView
MyDataGrid.DataBind()
End Sub
</script>
<head runat="server">
<title>TemplateColumn Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>TemplateColumn Example</h3>
<asp:DataGrid id="MyDataGrid" runat="server"
BorderColor="black"
CellPadding="2"
OnEditCommand="MyDataGrid_Edit"
OnCancelCommand="MyDataGrid_Cancel"
OnUpdateCommand="MyDataGrid_Update"
ShowFooter="True"
AutoGenerateColumns="false">
<Columns>
<asp:EditCommandColumn
EditText="Edit"
CancelText="Cancel"
UpdateText="Update"
ItemStyle-Wrap="false"
HeaderText="Edit Controls"/>
<asp:BoundColumn HeaderText="Description"
ReadOnly="true"
DataField="Item"/>
<asp:TemplateColumn>
<HeaderTemplate>
<b> Tax </b>
</HeaderTemplate>
<ItemTemplate>
<asp:Label
Text='<%# DataBinder.Eval(Container.DataItem, "Tax") %>'
runat="server"/>
</ItemTemplate>
<EditItemTemplate>
<asp:CheckBox
Text="Taxable"
runat="server"/>
</EditItemTemplate>
<FooterTemplate>
<asp:HyperLink id="HyperLink1"
Text="Microsoft"
NavigateUrl="http://www.microsoft.com"
runat="server"/>
</FooterTemplate>
</asp:TemplateColumn>
<asp:BoundColumn HeaderText="Price"
DataField="Price"/>
</Columns>
</asp:DataGrid>
</form>
</body>
</html>
Hinweise
Verwenden Sie die ItemTemplate Eigenschaft, um die Darstellung eines Datenelements im TemplateColumn Objekt zu steuern. Die Darstellung wird durch Erstellen einer Vorlage angegeben, die definiert, wie das Element in der Spalte gerendert wird. Wenn Sie eine Vorlage für das zum Bearbeiten ausgewählte Element angeben möchten, platzieren Sie zum ersten Mal öffnende und schließende <ItemTemplate> Tags zwischen den öffnenden und schließenden Tags des <TemplateColumn> Elements. Anschließend können Sie den Inhalt auflisten, der die Darstellung des Elements zwischen den öffnenden und schließenden <ItemTemplate> Tags steuert. Der Inhalt kann so einfach wie nur Text sein oder durch Einbetten anderer Steuerelemente in die Vorlage komplexer werden.