BulletedList.FirstBulletNumber 属性

参考

定义

命名空间:: System.Web.UI.WebControls

程序集:: System.Web.dll

重要

一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。

获取或设置排序 BulletedList 控件中列表项开始编号的值。

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

public virtual int FirstBulletNumber { get; set; }

member this.FirstBulletNumber : int with get, set

Public Overridable Property FirstBulletNumber As Integer

属性值

Int32

排序 BulletedList 控件中列表项开始编号的值。默认为 1。

示例

下面的代码示例演示如何创建控件 BulletedList 并设置 FirstBulletNumber 属性以指定开始对控件中的 BulletedList 列表项进行编号的值。开始列表项编号的值会根据用户在文本框中输入的值而更改。

重要

此示例具有一个接受用户输入的文本框，这是一个潜在的安全威胁。默认情况下，ASP.NET 网页验证用户输入是否不包含脚本或 HTML 元素。有关详细信息，请参阅脚本侵入概述。

<%@ 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 runat="server">
  <title>First Bullet Number Example</title>
  <script runat="server">

    void Index_Changed(object sender, System.EventArgs e)
    {
        
      // Set the starting number for the bulleted list.
        ItemsBulletedList.FirstBulletNumber = Convert.ToInt32(StartValue.Text);
        switch (BulletStylesListBox.SelectedIndex) 
      {
            case 0:
                ItemsBulletedList.BulletStyle = BulletStyle.Numbered;
                break;
            case 1:
                ItemsBulletedList.BulletStyle = BulletStyle.LowerAlpha;
                break;
            case 2:
                ItemsBulletedList.BulletStyle = BulletStyle.UpperAlpha;
                break;
            case 3:
                ItemsBulletedList.BulletStyle = BulletStyle.LowerRoman;
                break;
            case 4:
                ItemsBulletedList.BulletStyle = BulletStyle.UpperRoman;
                break;
            default:
                throw new Exception("You did not select a valid bullet style");
                break;
        }
    }

  </script>

</head>
<body>

  <h3>First Bullet Number Example</h3>

  <form id="form1" runat="server">
                    
    <asp:BulletedList id="ItemsBulletedList"             
      BulletStyle="Disc" 
      DisplayMode="Text"
      runat="server">    
        <asp:ListItem Value="http://www.cohowinery.com">Coho Winery</asp:ListItem>
        <asp:ListItem Value="http://www.contoso.com">Contoso, Ltd.</asp:ListItem>
        <asp:ListItem Value="http://www.tailspintoys.com">Tailspin Toys</asp:ListItem>
    </asp:BulletedList>    
              
    <hr />
        
    <h4>Enter the first number to start the list</h4>        
        
    <asp:TextBox id="StartValue" 
      Text="1"
      runat="server">
    </asp:TextBox><br />    
            
    <asp:RangeValidator id="Range1" 
      ControlToValidate="StartValue"
      MinimumValue="1"
      MaximumValue="32000"
      Type="Integer"
      ErrorMessage="Please enter a number greater than zero and less than 32,000."
      runat="server">
    </asp:RangeValidator><br />            
        
    <h4>Select a bullet type:</h4>
    <asp:ListBox id="BulletStylesListBox" 
      SelectionMode="Single"
      Rows="1"
      AutoPostBack="True"
      OnSelectedIndexChanged="Index_Changed"
      CausesValidation="true"
      runat="server" >        
        <asp:ListItem Value="Numbered">Numbered</asp:ListItem>
        <asp:ListItem Value="LowerAlpha">LowerAlpha</asp:ListItem>
        <asp:ListItem Value="UpperAlpha">UpperAlpha</asp:ListItem>
        <asp:ListItem Value="LowerRoman">LowerRoman</asp:ListItem>
        <asp:ListItem Value="UpperRoman">UpperRoman</asp:ListItem>       
    </asp:ListBox><br />

    <hr />
  </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">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
  <title>First Bullet Number Example</title>
  <script runat="server">

    Sub Index_Changed(ByVal sender As Object, ByVal e As System.EventArgs)
      
      ' Set the starting number for the bulleted list.
      ItemsBulletedList.FirstBulletNumber = StartValue.Text
      Select Case (BulletStylesListBox.SelectedIndex)
        Case 0
          ItemsBulletedList.BulletStyle = BulletStyle.Numbered
        Case 1
          ItemsBulletedList.BulletStyle = BulletStyle.LowerAlpha
        Case 2
          ItemsBulletedList.BulletStyle = BulletStyle.UpperAlpha
        Case 3
          ItemsBulletedList.BulletStyle = BulletStyle.LowerRoman
        Case 4
          ItemsBulletedList.BulletStyle = BulletStyle.UpperRoman
        Case Else
          Throw New Exception("You did not select a valid bullet style")
      End Select
    End Sub

  </script>

</head>
<body>

  <h3>First Bullet Number Example</h3>

  <form id="form1" runat="server">
                    
    <asp:BulletedList id="ItemsBulletedList"             
      BulletStyle="Disc" 
      DisplayMode="Text"
      runat="server">    
        <asp:ListItem Value="http://www.cohowinery.com">Coho Winery</asp:ListItem>
        <asp:ListItem Value="http://www.contoso.com">Contoso, Ltd.</asp:ListItem>
        <asp:ListItem Value="http://www.tailspintoys.com">Tailspin Toys</asp:ListItem>
    </asp:BulletedList>    
              
    <hr />
        
    <h4>Enter the first number to start the list</h4>        
        
    <asp:TextBox id="StartValue" 
      Text="1"
      runat="server">
    </asp:TextBox><br />    
            
    <asp:RangeValidator id="Range1" 
      ControlToValidate="StartValue"
      MinimumValue="1"
      MaximumValue="32000"
      Type="Integer"
      ErrorMessage="Please enter a number greater than zero and less than 32,000."
      runat="server" >
    </asp:RangeValidator><br />            
        
    <h4>Select a bullet type:</h4>
    <asp:ListBox id="BulletStylesListBox" 
      SelectionMode="Single"
      Rows="1"
      AutoPostBack="True"
      OnSelectedIndexChanged="Index_Changed"
      CausesValidation="true"
      runat="server" >        
        <asp:ListItem Value="Numbered">Numbered</asp:ListItem>
        <asp:ListItem Value="LowerAlpha">LowerAlpha</asp:ListItem>
        <asp:ListItem Value="UpperAlpha">UpperAlpha</asp:ListItem>
        <asp:ListItem Value="LowerRoman">LowerRoman</asp:ListItem>
        <asp:ListItem Value="UpperRoman">UpperRoman</asp:ListItem>
    </asp:ListBox><br />

    <hr />
  </form>

</body>
</html>

注解

FirstBulletNumber使用属性指定值，该值开始对有序BulletedList控件中的列表项进行编号。如果BulletStyle属性设置为 Disc、Square、 Circle或 CustomImage 值，则忽略分配给 FirstBulletNumber 属性的值。虽然属性的值 FirstBulletNumber 是整数，但它并不总是导致项目符号呈现为数字。例如，如果将属性4设置为 FirstBulletNumber 并将属性设置为 BulletStyle 值 LowerAlpha，则第一个项目符号编号将呈现为小写 d。

此属性的值存储在视图状态中。

适用于

通过

BulletedList.FirstBulletNumber 属性

定义

属性值

示例

注解

适用于

另请参阅

其他资源