DataList.ShowHeader 属性

参考

定义

命名空间:: System.Web.UI.WebControls

程序集:: System.Web.dll

重要

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获取或设置一个值，该值指示是否在 DataList 控件中显示页眉节。

public:
 virtual property bool ShowHeader { bool get(); void set(bool value); };

[System.ComponentModel.Bindable(true)]
public virtual bool ShowHeader { get; set; }

public virtual bool ShowHeader { get; set; }

[<System.ComponentModel.Bindable(true)>]
member this.ShowHeader : bool with get, set

member this.ShowHeader : bool with get, set

Public Overridable Property ShowHeader As Boolean

属性值

Boolean

如果显示页眉，则为 true；否则为 false。默认值为 true，但仅当 HeaderTemplate 属性不为 null 时，才检查此属性。

属性: BindableAttribute

示例

下面的代码示例演示如何使用 ShowHeader 属性在控件中 DataList 显示标头部分。

注意

下面的代码示例使用单文件代码模型，如果直接复制到代码隐藏文件中，可能无法正常工作。此代码示例必须复制到扩展名为 .aspx 的空文本文件中。有关 Web 窗体代码模型的详细信息，请参阅 ASP.NET Web 窗体页代码模型。


<%@ 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">
 
      ICollection CreateDataSource() 
      {
      
         // Create sample data for the DataList 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)));
         dt.Columns.Add(new DataColumn("ImageValue", typeof(String)));
 
         // Populate the table with sample values.
         for (int i = 0; i < 9; i++) 
         {
            dr = dt.NewRow();
 
            dr[0] = i;
            dr[1] = "Description for item " + i.ToString();
            dr[2] = 1.23 * (i + 1);
            dr[3] = "Image" + i.ToString() + ".jpg";
 
            dt.Rows.Add(dr);
         }
 
         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) 
         {
            ItemsList.DataSource = CreateDataSource();
            ItemsList.DataBind();
         }

      }

      void Selection_Change(Object sender, EventArgs e)
      {

         // Set whether to display the header and footer sections
         // of the DataList control.
         ItemsList.ShowHeader = ShowHeaderCheckBox.Checked;
         ItemsList.ShowFooter = ShowFooterCheckBox.Checked;

      }
 
   </script>
 
<head runat="server">
    <title>DataList ShowHeader and ShowFooter Example</title>
</head>
<body>
 
   <form id="form1" runat="server">

      <h3>DataList ShowHeader and ShowFooter Example</h3>

      Select whether to show or hide the header and footer sections.

      <br /><br />
 
      <asp:DataList id="ItemsList"
           BorderColor="black"
           CellPadding="5"
           CellSpacing="5"
           RepeatDirection="Vertical"
           RepeatLayout="Table"
           RepeatColumns="3"
           ShowHeader="True"
           ShowFooter="True"
           runat="server">

         <HeaderStyle BackColor="#aaaadd">
         </HeaderStyle>

         <FooterStyle BackColor="#aaaadd">
         </FooterStyle>

         <AlternatingItemStyle BackColor="Gainsboro">
         </AlternatingItemStyle>

         <HeaderTemplate>

            List of items

         </HeaderTemplate>

         <FooterTemplate>

            <asp:Image id="FooterImage"
                 GenerateEmptyAlternateText='true'
                 ImageUrl='FooterImage.jpg'
                 runat="server"/>

         </FooterTemplate>
               
         <ItemTemplate>

            Description: <br />
            <%# DataBinder.Eval(Container.DataItem, "StringValue") %>

            <br />

            Price: <%# DataBinder.Eval(Container.DataItem, "CurrencyValue", "{0:c}") %>

            <br />

            <asp:Image id="ProductImage"
                 AlternateText='<%# DataBinder.Eval(Container.DataItem, "StringValue") %>'
                 ImageUrl='<%# DataBinder.Eval(Container.DataItem, "ImageValue") %>'
                 runat="server"/>

         </ItemTemplate>
 
      </asp:DataList>

<hr />

      <table cellpadding="5">

         <tr>

            <td>

               <asp:CheckBox id="ShowHeaderCheckBox"
                    Text="Show header section"
                    Checked="True"
                    AutoPostBack="True"
                    OnCheckedChanged="Selection_Change"
                    runat="server"/>
 
            </td>

            <td>

               <asp:CheckBox id="ShowFooterCheckBox"
                    Text="Show footer section"
                    Checked="True"
                    AutoPostBack="True"
                    OnCheckedChanged="Selection_Change"
                    runat="server"/>

            </td>

         </tr>

      </table>
 
   </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">
 
      Function CreateDataSource() As ICollection 
      
         ' Create sample data for the DataList 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)))
         dt.Columns.Add(New DataColumn("ImageValue", GetType(String)))
 
         ' Populate the table with sample values.
         Dim i As Integer

         For i = 0 To 8 

            dr = dt.NewRow()
 
            dr(0) = i
            dr(1) = "Description for item " & i.ToString()
            dr(2) = 1.23 * (i + 1)
            dr(3) = "Image" & i.ToString() & ".jpg"
 
            dt.Rows.Add(dr)

         Next i
 
         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 
     
            ItemsList.DataSource = CreateDataSource()
            ItemsList.DataBind()
         
         End If

      End Sub

      Sub Selection_Change(sender As Object, e As EventArgs)

         ' Set whether to display the header and footer sections
         ' of the DataList control.
         ItemsList.ShowHeader = ShowHeaderCheckBox.Checked
         ItemsList.ShowFooter = ShowFooterCheckBox.Checked

      End Sub
 
   </script>
 
<head runat="server">
    <title>DataList ShowHeader and ShowFooter Example</title>
</head>
<body>
 
   <form id="form1" runat="server">

      <h3>DataList ShowHeader and ShowFooter Example</h3>

      Select whether to show or hide the header and footer sections.

      <br /><br />
 
      <asp:DataList id="ItemsList"
           BorderColor="black"
           CellPadding="5"
           CellSpacing="5"
           RepeatDirection="Vertical"
           RepeatLayout="Table"
           RepeatColumns="3"
           ShowHeader="True"
           ShowFooter="True"
           runat="server">

         <HeaderStyle BackColor="#aaaadd">
         </HeaderStyle>

         <FooterStyle BackColor="#aaaadd">
         </FooterStyle>

         <AlternatingItemStyle BackColor="Gainsboro">
         </AlternatingItemStyle>

         <HeaderTemplate>

            List of items

         </HeaderTemplate>

         <FooterTemplate>

            <asp:Image id="FooterImage"
                 GenerateEmptyAlternateText='true'
                 ImageUrl='FooterImage.jpg'
                 runat="server"/>

         </FooterTemplate>
               
         <ItemTemplate>

            Description: <br />
            <%# DataBinder.Eval(Container.DataItem, "StringValue") %>

            <br />

            Price: <%# DataBinder.Eval(Container.DataItem, "CurrencyValue", "{0:c}") %>

            <br />

            <asp:Image id="ProductImage"
                 AlternateText='<%# DataBinder.Eval(Container.DataItem, "StringValue") %>'
                 ImageUrl='<%# DataBinder.Eval(Container.DataItem, "ImageValue") %>'
                 runat="server"/>

         </ItemTemplate>
 
      </asp:DataList>

<hr />

      <table cellpadding="5">

         <tr>

            <td>

               <asp:CheckBox id="ShowHeaderCheckBox"
                    Text="Show header section"
                    Checked="True"
                    AutoPostBack="True"
                    OnCheckedChanged="Selection_Change"
                    runat="server"/>
 
            </td>

            <td>

               <asp:CheckBox id="ShowFooterCheckBox"
                    Text="Show footer section"
                    Checked="True"
                    AutoPostBack="True"
                    OnCheckedChanged="Selection_Change"
                    runat="server"/>

            </td>

         </tr>

      </table>
 
   </form>
 
</body>
</html>

注解

ShowHeader使用属性指定是否在控件中DataList显示标头部分。

可以通过设置 HeaderStyle 属性来控制标头部分的外观。标头部分的内容由 HeaderTemplate 属性控制。

适用于

通过

DataList.ShowHeader 属性

定义

属性值

示例

注解

适用于

另请参阅

其他资源