CheckBoxList.IRepeatInfoUser.RenderItem 方法

參考

定義

命名空間:: System.Web.UI.WebControls

組件:: System.Web.dll

重要

部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。

如需這個成員的說明，請參閱 RenderItem(ListItemType, Int32, RepeatInfo, HtmlTextWriter)。

 virtual void System.Web.UI.WebControls.IRepeatInfoUser.RenderItem(System::Web::UI::WebControls::ListItemType itemType, int repeatIndex, System::Web::UI::WebControls::RepeatInfo ^ repeatInfo, System::Web::UI::HtmlTextWriter ^ writer) = System::Web::UI::WebControls::IRepeatInfoUser::RenderItem;

void IRepeatInfoUser.RenderItem (System.Web.UI.WebControls.ListItemType itemType, int repeatIndex, System.Web.UI.WebControls.RepeatInfo repeatInfo, System.Web.UI.HtmlTextWriter writer);

abstract member System.Web.UI.WebControls.IRepeatInfoUser.RenderItem : System.Web.UI.WebControls.ListItemType * int * System.Web.UI.WebControls.RepeatInfo * System.Web.UI.HtmlTextWriter -> unit
override this.System.Web.UI.WebControls.IRepeatInfoUser.RenderItem : System.Web.UI.WebControls.ListItemType * int * System.Web.UI.WebControls.RepeatInfo * System.Web.UI.HtmlTextWriter -> unit

Sub RenderItem (itemType As ListItemType, repeatIndex As Integer, repeatInfo As RepeatInfo, writer As HtmlTextWriter) Implements IRepeatInfoUser.RenderItem

參數

itemType: ListItemType

其中一個 ListItemType 列舉值。

repeatIndex: Int32

序數索引，指定清單控制中項目的位置。

repeatInfo: RepeatInfo

RepeatInfo 物件，代表用來呈現清單中項目的資訊。

writer: HtmlTextWriter

HtmlTextWriter 物件，代表要在用戶端呈現 HTML 內容的輸出資料流。

實作

RenderItem(ListItemType, Int32, RepeatInfo, HtmlTextWriter)

範例

下列程式碼範例示範如何在自訂 CheckBoxList 物件上使用 IRepeatInfoUser 介面成員。

<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.CS.Controls" Assembly="Samples.AspNet.CS" %>
<%@ Page language="c#" %>
<!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" >
  <head>
    <title>Custom CheckBoxList - IRepeatInfoUser - C# Example</title>
  </head>
  <body>
    <form id="Form1" method="post" runat="server">
      <h3>Custom CheckBoxList - IRepeatInfoUser - C# Example</h3>
      <aspSample:CustomCheckBoxListIRepeatInfoUser
        id="CheckBoxList1" runat="server">
          <asp:ListItem Selected="True">Item 1</asp:ListItem>
          <asp:ListItem>Item 2</asp:ListItem>
          <asp:ListItem>Item 3</asp:ListItem>
          <asp:ListItem>Item 4</asp:ListItem>
          <asp:ListItem>Item 5</asp:ListItem>
          <asp:ListItem>Item 6</asp:ListItem>
      </aspSample:CustomCheckBoxListIRepeatInfoUser>
    </form>
  </body>
</html>

<%@ Page language="VB" %>
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.VB.Controls" Assembly="Samples.AspNet.VB" %>
<!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" >
    <head>
        <title>Custom CheckBoxList - IRepeatInfoUser - VB.NET Example</title>
    </head>
    <body>
        <form id="Form1" method="post" runat="server">
            <h3>Custom CheckBoxList - IRepeatInfoUser - VB.NET Example</h3>
      <aspSample:CustomCheckBoxListIRepeatInfoUser id="CheckBoxList" runat="server">
                <asp:ListItem  Selected="True">Item 1</asp:ListItem>
                <asp:ListItem>Item 2</asp:ListItem>
                <asp:ListItem>Item 3</asp:ListItem>
                <asp:ListItem>Item 4</asp:ListItem>
                <asp:ListItem>Item 5</asp:ListItem>
                <asp:ListItem>Item 6</asp:ListItem>
            </aspSample:CustomCheckBoxListIRepeatInfoUser>
        </form>
    </body>
</html>

using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Security.Permissions;

namespace Samples.AspNet.CS.Controls
{
    [AspNetHostingPermission(SecurityAction.Demand, Level = 
        AspNetHostingPermissionLevel.Minimal)]
    public class CustomCheckBoxListIRepeatInfoUser : CheckBoxList
    {
        private bool hasFooter;
        private bool hasHeader;
        private bool hasSeparators;
        private int repeatedItemCount;
        private Style itemStyleItem;

        protected override void OnPreRender(System.EventArgs e)
        {
            // Call the base class's OnPreRender method
            base.OnPreRender(e);

            // Get a self-referencing IRepeatInfoUser object
            IRepeatInfoUser repeatInfoUser = (IRepeatInfoUser)this;

            // Get the IRepeatInfoUser members values.
            hasFooter = repeatInfoUser.HasFooter;
            hasHeader = repeatInfoUser.HasHeader;
            hasSeparators = repeatInfoUser.HasSeparators;
            repeatedItemCount = repeatInfoUser.RepeatedItemCount;
            itemStyleItem = repeatInfoUser.GetItemStyle(ListItemType.Item, 0);
        }

        protected override void Render(HtmlTextWriter writer)
        {
            // Create and setup a RepeatInfo class.
            RepeatInfo repeatInfo = new RepeatInfo();
            repeatInfo.RepeatColumns = 0;
            repeatInfo.RepeatDirection = RepeatDirection.Horizontal;
            repeatInfo.RepeatLayout = RepeatLayout.Table;

            // Get a self-referencing IRepeatInfoUser object
            IRepeatInfoUser repeatInfoUser = (IRepeatInfoUser)this;

            // Render the items using the above RepeatInfo class.
            repeatInfoUser.RenderItem(ListItemType.Item, 0, repeatInfo, writer);
            repeatInfoUser.RenderItem(ListItemType.Item, 1, repeatInfo, writer);
            repeatInfoUser.RenderItem(ListItemType.Item, 2, repeatInfo, writer);
            repeatInfoUser.RenderItem(ListItemType.Item, 3, repeatInfo, writer);
            repeatInfoUser.RenderItem(ListItemType.Item, 4, repeatInfo, writer);
            repeatInfoUser.RenderItem(ListItemType.Item, 5, repeatInfo, writer);
        }
    }
}

Imports System.Web
Imports System.Web.UI
Imports System.Web.UI.WebControls
Imports System.Security.Permissions

Namespace Samples.AspNet.VB.Controls

    <AspNetHostingPermission(SecurityAction.Demand, Level:=AspNetHostingPermissionLevel.Minimal)> _
    Public Class CustomCheckBoxListIRepeatInfoUser
        Inherits CheckBoxList

        Private _hasFooter As Boolean
        Private _hasHeader As Boolean
        Private _hasSeparators As Boolean
        Private _repeatedItemCount As Integer
        Private _itemStyleItem As Style

        Protected Overrides Sub OnPreRender(ByVal e As System.EventArgs)
            ' Call the base class's OnPreRender method
            MyBase.OnPreRender(e)

            ' Get a self-referencing IRepeatInfoUser object
            Dim repeatInfoUser As IRepeatInfoUser
            repeatInfoUser = CType(Me, IRepeatInfoUser)

            ' Get the IRepeatInfoUser member values.
            _hasFooter = repeatInfoUser.HasFooter
            _hasHeader = repeatInfoUser.HasHeader
            _hasSeparators = repeatInfoUser.HasSeparators
            _repeatedItemCount = repeatInfoUser.RepeatedItemCount
            _itemStyleItem = repeatInfoUser.GetItemStyle(ListItemType.Item, 0)
        End Sub

        Protected Overrides Sub Render(ByVal writer As System.Web.UI.HtmlTextWriter)
            ' Create and setup a RepeatInfo class.
            Dim repeatInfo As New RepeatInfo
            repeatInfo.RepeatColumns = 0
            repeatInfo.RepeatDirection = RepeatDirection.Horizontal
            repeatInfo.RepeatLayout = RepeatLayout.Table

            ' Get a self-referencing IRepeatInfoUser object
            Dim repeatInfoUser As IRepeatInfoUser
            repeatInfoUser = CType(Me, IRepeatInfoUser)

            ' Render the items using the above RepeatInfo and IRepeatInfoUser classes.
            repeatInfoUser.RenderItem(ListItemType.Item, 0, repeatInfo, writer)
            repeatInfoUser.RenderItem(ListItemType.Item, 1, repeatInfo, writer)
            repeatInfoUser.RenderItem(ListItemType.Item, 2, repeatInfo, writer)
            repeatInfoUser.RenderItem(ListItemType.Item, 3, repeatInfo, writer)
            repeatInfoUser.RenderItem(ListItemType.Item, 4, repeatInfo, writer)
            repeatInfoUser.RenderItem(ListItemType.Item, 5, repeatInfo, writer)
        End Sub
    End Class

End Namespace

備註

一般而言，您應該使用 CheckBoxList.RenderItem 方法來轉譯物件中的 CheckBoxList 專案。

方法是 IRepeatInfoUser.RenderItem 明確的介面成員實作。只有在 CheckBoxList 執行個體轉換成 IRepeatInfoUser 介面時，才能使用這個成員。

給繼承者的注意事項

若要定義自訂實作以轉譯物件中的 CheckBoxList 專案，請覆寫 RenderItem(ListItemType, Int32, RepeatInfo, HtmlTextWriter) 成員。明確介面實作會 RenderItem(ListItemType, Int32, RepeatInfo, HtmlTextWriter) 呼叫方法，以呈現控制項中的專案。

適用於

共用方式為

CheckBoxList.IRepeatInfoUser.RenderItem 方法

定義

參數

實作

範例

備註

給繼承者的注意事項

適用於

另請參閱

意見反應

其他資源