ListView.GroupItemCount 属性

参考

定义

命名空间:: System.Web.UI.WebControls

程序集:: System.Web.Extensions.dll

重要

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获取或设置 ListView 控件中每组显示的项数。

public:
 virtual property int GroupItemCount { int get(); void set(int value); };

public virtual int GroupItemCount { get; set; }

member this.GroupItemCount : int with get, set

Public Overridable Property GroupItemCount As Integer

属性值

Int32

ListView 控件中每组显示的项数。默认值为 1，表示 ListView 控件将每组显示一项。

例外

ArgumentOutOfRangeException

GroupItemCount 属性被设置为小于 1 的值。

示例

以下示例演示如何使用 GroupItemCount 属性在 ListView 控件中创建平铺布局。它还演示如何以编程方式更改此属性。

<%@ Page language="C#" %>
    
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

    protected void GroupItemCountList_SelectedIndexChanged(object sender, EventArgs e)
    {
      // Changes the number of items displayed for each group.
      ContactsListView.GroupItemCount = 
        Convert.ToInt32(GroupItemCountList.SelectedValue);
    }
    
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head id="Head1" runat="server">
    <title>ListView GroupItemCount Example</title>
    <style type="text/css">
      body { font: 10pt Trebuchet MS; }        
    </style>
  </head>
  <body>
    <form id="form1" runat="server">
        
      <h3>ListView GroupItemCount Example</h3>

      Number of columns:
      <asp:DropDownList ID="GroupItemCountList"
        AutoPostBack="true"
        runat="server"         
        OnSelectedIndexChanged="GroupItemCountList_SelectedIndexChanged"        
        >
          <asp:ListItem>1</asp:ListItem>
          <asp:ListItem Selected="True">2</asp:ListItem>
          <asp:ListItem>3</asp:ListItem>
          <asp:ListItem>4</asp:ListItem>
      </asp:DropDownList>
      <br />
      <br />      
      <hr />
      
      <asp:ListView ID="ContactsListView" 
        DataSourceID="ContactsDataSource" 
        GroupItemCount="2"        
        runat="server">
        <LayoutTemplate>
          <table id="tblContacts" runat="server" cellspacing="0" cellpadding="2">
            <tr runat="server" id="groupPlaceholder" />
          </table>
          <asp:DataPager runat="server" ID="ContactsDataPager" PageSize="24">
            <Fields>
              <asp:NextPreviousPagerField 
                ShowFirstPageButton="true" ShowLastPageButton="true"
                FirstPageText="|&lt;&lt; " LastPageText=" &gt;&gt;|"
                NextPageText=" &gt; " PreviousPageText=" &lt; " />
            </Fields>
          </asp:DataPager>
        </LayoutTemplate>
        <ItemTemplate>
          <td align="center" style="width:10px" runat="server">
            <asp:Label ID="IDLabel" runat="Server" Text='<%#Eval("ContactID") %>' />
          </td>
          <td style="width:70px" runat="server">
            <asp:Label ID="FirstNameLabel" runat="Server" Text='<%#Eval("FirstName") %>' />
          </td>
          <td style="width:70px" runat="server">
            <asp:Label ID="LastNameLabel" runat="Server" Text='<%#Eval("LastName") %>' />
          </td>
        </ItemTemplate>
        <GroupTemplate>
          <tr runat="server" id="ContactsRow" style="background-color: #FFFFFF">
            <td runat="server" id="itemPlaceholder" />
          </tr>
        </GroupTemplate>
        <ItemSeparatorTemplate>
          <td runat="server" style="border-right: 1px solid #00C0C0">&nbsp;</td>
        </ItemSeparatorTemplate>
      </asp:ListView>

      <!-- This example uses Microsoft SQL Server and connects      -->
      <!-- to the AdventureWorks sample database. Use an ASP.NET    -->
      <!-- expression to retrieve the connection string value       -->
      <!-- from the Web.config file.                                -->
      <asp:SqlDataSource ID="ContactsDataSource" runat="server" 
        ConnectionString="<%$ ConnectionStrings:AdventureWorks_DataConnectionString %>"
        SelectCommand="SELECT [ContactID], [FirstName], [LastName] FROM Person.Contact">
      </asp:SqlDataSource>
      
    </form>
  </body>
</html>

<%@ Page language="VB" %>
    
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

  Protected Sub GroupItemCountList_SelectedIndexChanged(ByVal sender As Object, _
    ByVal e As EventArgs)
          
    ' Changes the number of items displayed for each group.  
    ContactsListView.GroupItemCount = _
      Convert.ToInt32(GroupItemCountList.SelectedValue)
        
  End Sub
    
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head id="Head1" runat="server">
    <title>ListView GroupItemCount Example</title>
    <style type="text/css">
      body { font: 10pt Trebuchet MS; }        
    </style>
  </head>
  <body>
    <form id="form1" runat="server">
        
      <h3>ListView GroupItemCount Example</h3>

      Number of columns:
      <asp:DropDownList ID="GroupItemCountList"
        AutoPostBack="true"
        runat="server"         
        OnSelectedIndexChanged="GroupItemCountList_SelectedIndexChanged"        
        >
          <asp:ListItem>1</asp:ListItem>
          <asp:ListItem Selected="True">2</asp:ListItem>
          <asp:ListItem>3</asp:ListItem>
          <asp:ListItem>4</asp:ListItem>
      </asp:DropDownList>
      <br />
      <br />      
      <hr />
      
      <asp:ListView ID="ContactsListView" 
        DataSourceID="ContactsDataSource" 
        GroupItemCount="2"        
        runat="server">
        <LayoutTemplate>
          <table id="tblContacts" runat="server" cellspacing="0" cellpadding="2">
            <tr runat="server" id="groupPlaceholder" />
          </table>
          <asp:DataPager runat="server" ID="ContactsDataPager" PageSize="24">
            <Fields>
              <asp:NextPreviousPagerField 
                ShowFirstPageButton="true" ShowLastPageButton="true"
                FirstPageText="|&lt;&lt; " LastPageText=" &gt;&gt;|"
                NextPageText=" &gt; " PreviousPageText=" &lt; " />
            </Fields>
          </asp:DataPager>
        </LayoutTemplate>
        <ItemTemplate>
          <td align="center" style="width:10px" runat="server">
            <asp:Label ID="IDLabel" runat="Server" Text='<%#Eval("ContactID") %>' />
          </td>
          <td style="width:70px" runat="server">
            <asp:Label ID="FirstNameLabel" runat="Server" Text='<%#Eval("FirstName") %>' />
          </td>
          <td style="width:70px" runat="server">
            <asp:Label ID="LastNameLabel" runat="Server" Text='<%#Eval("LastName") %>' />
          </td>
        </ItemTemplate>
        <GroupTemplate>
          <tr runat="server" id="ContactsRow" style="background-color: #FFFFFF">
            <td runat="server" id="itemPlaceholder" />
          </tr>
        </GroupTemplate>
        <ItemSeparatorTemplate>
          <td runat="server" style="border-right: 1px solid #00C0C0">&nbsp;</td>
        </ItemSeparatorTemplate>
      </asp:ListView>

      <!-- This example uses Microsoft SQL Server and connects      -->
      <!-- to the AdventureWorks sample database. Use an ASP.NET    -->
      <!-- expression to retrieve the connection string value       -->
      <!-- from the Web.config file.                                -->
      <asp:SqlDataSource ID="ContactsDataSource" runat="server" 
        ConnectionString="<%$ ConnectionStrings:AdventureWorks_DataConnectionString %>"
        SelectCommand="SELECT [ContactID], [FirstName], [LastName] FROM Person.Contact">
      </asp:SqlDataSource>
      
    </form>
  </body>
</html>

注解

GroupItemCount使用属性可指定要在控件中ListView组合在一起的项数。 (换句话说，这将指定要为 control 的每个组显示的项数。) 对于每个组，控件 ListView 呈现模板的内容 GroupTemplate ，并将项占位符替换为实际项内容。它执行此操作的次数是属性定义的项数的 GroupItemCount 倍数。

可以将 GroupItemCount 与模板一起使用， GroupTemplate 在控件中创建 ListView 平铺布局。在平铺表格布局中，项目在一行中水平重复。项的重复次数由 GroupItemCount 属性指定。

适用于

通过

ListView.GroupItemCount 属性

定义

属性值

例外

示例

注解

适用于

另请参阅

其他资源