后台动态加载文件代码：

//假设css文件：TestCss.css        #region 动态加载css文件        public void AddCss()        {            HtmlGenericControl _CssFile = new HtmlGenericControl("link");            _CssFile.ID = "CssFile";            _CssFile.Attributes["rel"] = "stylesheet";            _CssFile.Attributes["type"] = "text/css";            _CssFile.Attributes["href"] = "/Styles/TestCss.css";            if (this.FindControl(_CssFile.ID) == null)            {                this.Page.Header.Controls.Add(_CssFile);            }        }        #endregion 动态加载css文件

换肤方案

1) 写个类（Page_Parent.cs） 动态加载样式文件

2) 所有页面继承Page_Parent.cs类

 

Page_Parent.cs类

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.UI.HtmlControls;namespace Test{    public class Page_Parent: System.Web.UI.Page    {      public Page_Parent()        {            this.Load += Page_Parent_Load;            this.Error += Page_Parent_Error;        }        /// 
        /// 捕捉未处理的页面错误        /// 
        ///         ///         private void Page_Parent_Error(object sender, EventArgs e)        {            throw new NotImplementedException();        }        private void Page_Parent_Load(object sender, EventArgs e)        {            AddCss();        }        //假设css文件：TestCss.css        #region 动态加载css文件        public void AddCss()        {            HtmlGenericControl _CssFile = new HtmlGenericControl("link");            _CssFile.ID = "CssFile";            _CssFile.Attributes["rel"] = "stylesheet";            _CssFile.Attributes["type"] = "text/css";            _CssFile.Attributes["href"] = "/Styles/TestCss.css";            if (this.FindControl(_CssFile.ID) == null)            {                this.Page.Header.Controls.Add(_CssFile);            }        }        #endregion 动态加载css文件    }}

 

测试页面Web_Test.aspx：

 

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Web_Test.aspx.cs" Inherits="Web.Web_Test" %>
             
     
    
      
    
       
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using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;namespace Web{    public partial class Web_Test : Page_Parent    {        protected void Page_Load(object sender, EventArgs e)        {        }    }}