CssStyleCollection.Item[] 属性

定义

获取或设置 HTML 服务器控件的 CSS 值。

重载

Item[String]

获取或设置 HTML 服务器控件的指定 CSS 值。

Item[HtmlTextWriterStyle]

获取或设置 HTML 服务器控件的指定 HtmlTextWriterStyle 值。

Item[String]

获取或设置 HTML 服务器控件的指定 CSS 值。

public:
 property System::String ^ default[System::String ^] { System::String ^ get(System::String ^ key); void set(System::String ^ key, System::String ^ value); };
public string this[string key] { get; set; }
member this.Item(string) : string with get, set
Default Public Property Item(key As String) As String

参数

key
String

CSS 特性的索引。

属性值

String

key 的值。

示例

下面的代码示例使用 Item[] 属性返回在控件上 HtmlInputText 设置的样式的值。

<%@ 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 Page_Load(object sender, EventArgs e)
  {
    MyText.Style.Add(HtmlTextWriterStyle.Width, "200");
    FirstMessage.Text = "The text box font color is: " + 
      MyText.Style["color"] + "<br />" +
      "The text box width is: " + 
      MyText.Style[HtmlTextWriterStyle.Width];
  }
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>CssCollection This Example</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
      <input id="MyText"
             type="text" 
             value="Type a value here."
             style="font: 14pt Verdana; color: blue;"
             runat="server"/>
      <br />
      <asp:Label id="FirstMessage"
                 runat="server"/>
    </div>
    </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 Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)

    MyText.Style.Add(HtmlTextWriterStyle.Width, "200")
    FirstMessage.Text = "The text box font color is: " _
      & MyText.Style("color") & "<br />" _
      & "The text box width is: " & MyText.Style(HtmlTextWriterStyle.Width)

  End Sub
  
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>CssCollection This Example</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
      <input id="MyText"
             type="text" 
             value="Type a value here."
             style="font: 14pt Verdana; color: blue;"
             runat="server"/>
      <br />
      <asp:Label id="FirstMessage"
                 runat="server"/>
    </div>
    </form>
</body>
</html>

另请参阅

适用于

Item[HtmlTextWriterStyle]

获取或设置 HTML 服务器控件的指定 HtmlTextWriterStyle 值。

public:
 property System::String ^ default[System::Web::UI::HtmlTextWriterStyle] { System::String ^ get(System::Web::UI::HtmlTextWriterStyle key); void set(System::Web::UI::HtmlTextWriterStyle key, System::String ^ value); };
public string this[System.Web.UI.HtmlTextWriterStyle key] { get; set; }
member this.Item(System.Web.UI.HtmlTextWriterStyle) : string with get, set
Default Public Property Item(key As HtmlTextWriterStyle) As String

参数

属性值

String

key;否则,如果 key 不在服务器控件的集合中,则为 null

示例

下面的代码示例使用 Item[] 属性返回在控件上 HtmlInputText 设置的样式的值。

<%@ 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 Page_Load(object sender, EventArgs e)
  {
    MyText.Style.Add(HtmlTextWriterStyle.Width, "200");
    FirstMessage.Text = "The text box font color is: " + 
      MyText.Style["color"] + "<br />" +
      "The text box width is: " + 
      MyText.Style[HtmlTextWriterStyle.Width];
  }
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>CssCollection This Example</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
      <input id="MyText"
             type="text" 
             value="Type a value here."
             style="font: 14pt Verdana; color: blue;"
             runat="server"/>
      <br />
      <asp:Label id="FirstMessage"
                 runat="server"/>
    </div>
    </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 Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)

    MyText.Style.Add(HtmlTextWriterStyle.Width, "200")
    FirstMessage.Text = "The text box font color is: " _
      & MyText.Style("color") & "<br />" _
      & "The text box width is: " & MyText.Style(HtmlTextWriterStyle.Width)

  End Sub
  
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>CssCollection This Example</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
      <input id="MyText"
             type="text" 
             value="Type a value here."
             style="font: 14pt Verdana; color: blue;"
             runat="server"/>
      <br />
      <asp:Label id="FirstMessage"
                 runat="server"/>
    </div>
    </form>
</body>
</html>

注解

使用属性或Add将枚举值作为输入的方法以编程方式添加到CssStyleCollection控件Item[]的集合中的样式项包含在属性返回Count的样式项计数中,并且包含在属性返回Value的字符串文本HtmlTextWriterStyle中。 这些属性是强类型化的。 如果要添加到服务器控件的级联样式表属性存在于枚举中 HtmlTextWriterStyle ,请使用这些强类型方法。 如果要添加的属性在枚举中 HtmlTextWriterStyle 不存在,请使用 Item[] 属性或 Add 方法。

尝试访问HtmlTextWriterStyle尚未添加的控件中的CssStyleCollection枚举值或访问已使用Item[]属性或Add方法添加的 CSS 属性,请使用该Item[]属性返回null

另请参阅

适用于