TemplateColumn.HeaderTemplate Eigenschaft

Referenz

Definition

Namespace:: System.Web.UI.WebControls

Assembly:: System.Web.dll

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 des Headerbereichs des TemplateColumn-Objekts ab oder legt diese fest.

public:
 virtual property System::Web::UI::ITemplate ^ HeaderTemplate { 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 HeaderTemplate { 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.HeaderTemplate : System.Web.UI.ITemplate with get, set

Public Overridable Property HeaderTemplate As ITemplate

Eigenschaftswert

ITemplate

Ein implementiertes ITemplate-Objekt, das die Vorlage zum Anzeigen des Headerbereichs der TemplateColumn enthält. Der Standardwert ist null und gibt an, dass diese Eigenschaft nicht festgelegt ist.

Attribute: BrowsableAttribute PersistenceModeAttribute TemplateContainerAttribute

Beispiele

Im folgenden Codebeispiel wird veranschaulicht, wie die HeaderTemplate -Eigenschaft verwendet wird, um die Darstellung des Überschriftenabschnitts im TemplateColumn -Objekt zu steuern.


<%@ 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 HeaderTemplate -Eigenschaft, um die Darstellung des Überschriftenabschnitts 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 öffnende und schließende <HeaderTemplate> Tags zuerst 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 <HeaderTemplate> Tags steuert. Der Inhalt kann so einfach wie Nur-Text sein oder durch Einbetten anderer Steuerelemente in die Vorlage komplexer werden.

Gilt für:

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