<title>WebForm1</title>
<link rel="stylesheet" type="text/css" href="" id="mycss">
</head>
protected void Page_Load(object sender, EventArgs e)
{
Page.RegisterStartupScript("css",@"<script>mycss.styleSheet.addImport('stylesheet1.css')</script>");
}
方法二:利用占位符 asp:placeholder
<head>
<title>WebForm1</title>
<asp:placeholder id="myplaceholder" runat="server"></asp:placeholder>
</head>
protected void Page_Load(object sender, EventArgs e)
{
System.Web.UI.Control a = Page.FindControl("myplaceholder");
System.Web.UI.HtmlControls.HtmlGenericControl objLink = new HtmlGenericControl("LINK");
objLink.Attributes.Add("rel","stylesheet");
objLink.Attributes.Add("type","text/css");
objLink.Attributes.Add("href","StyleSheet1.css");
objLink=objLink;
a.Controls.Add(objLink);
}
[注] asp:placeholder 这是控件是主要是起"占位符的做用"
方法三：转换为服务器控件
<head>
<title>WebForm1</title>
<link runat ="server" id="MyLink" href="StyleSheet1.css" rel="stylesheet" type="text/css" />
</head>
protected void Page_Load(object sender, EventArgs e)
{
//动态更改css
MyLink.Href = "";//css链接
}
方法四：利用asp:Literal
<head>
<title>WebForm1</title>
<asp:Literal ID="Literal1" runat="server"></asp:Literal>
</head>
protected void Page_Load(object sender, EventArgs e)
{
//动态更改css
Literal1.Text = "<link href='StyleSheet1.css' rel='stylesheet' type='text/css' />";
}
[住] asp:Literal可以将原句不变的输出
方法五：直接操作head内容
<title>WebForm1</title>
<link rel="stylesheet" type="text/css" href="" id="mycss">
</head>
protected void Page_Load(object sender, EventArgs e)
{
System.Web.UI.HtmlControls.HtmlGenericControl child = new System.Web.UI.HtmlControls.HtmlGenericControl("link");
child.Attributes.Add("href", cssFilePath);
child.Attributes.Add("rel", "stylesheet");
child.Attributes.Add("type", "text/css");
Page handler = (Page)HttpContext.Current.Handler;
handler.Header.Controls.Clear();//清理
handler.Header.Controls.Add(child);
}
