url重写后页面回传问题

最近在做项目时遇到了URL重写后当页面回传时，url又刷回原值；这个问题困扰了很久，终于找到解决办法了。具体办法如下：可以通过自定义页面基类，重写默认的HtmlTextWriter方法，重写属性输出WriteAttribute(string name, string value, bool encode)方法，当输出action时，将action属性的值强制转换为当前虚URL(HttpContext.Current.Request.RawUrl，上面的~/showVisasAll_(\w+)\.aspx)

最后就是让所有的页面都调用这个基类，修改一下Web.config就好了
<!-- Openlab.Controls.OLPage为页面基类，Openlab.Controls为基类所在dll -->
<pages pageBaseType="Openlab.Controls.OLPage, Openlab.Controls"/>

附页面基类完整代码（参考CS代码完成）：

using System;
using System.IO;
using System.Web;
using System.Web.UI;

namespace Openlab.Controls
...{
    /**//// <summary>
    /// 页面基类
    /// </summary>
    public class OLPage : Page
    ...{
        public OLPage()
        ...{
        }

        Render#region Render

        /**//// <summary>
        ///  重写默认的HtmlTextWriter方法，修改form标记中的value属性，使其值为重写的URL而不是真实URL。
        /// </summary>
        /// <param name="writer"></param>
        protected override void Render(HtmlTextWriter writer)
        ...{

            if (writer is System.Web.UI.Html32TextWriter)
            ...{
                writer = new FormFixerHtml32TextWriter(writer.InnerWriter);
            }
            else
            ...{
                writer = new FormFixerHtmlTextWriter(writer.InnerWriter);
            }

            base.Render(writer);
        }
        #endregion


    }

    FormFixers#region FormFixers

    FormFixerHtml32TextWriter#region FormFixerHtml32TextWriter
    internal class FormFixerHtml32TextWriter : System.Web.UI.Html32TextWriter
    ...{
        private string _url; // 假的URL

        internal FormFixerHtml32TextWriter(TextWriter writer):base(writer)
        ...{
            _url = HttpContext.Current.Request.RawUrl;
        }

        public override void WriteAttribute(string name, string value, bool encode)
        ...{
            // 如果当前输出的属性为form标记的action属性，则将其值替换为重写后的虚假URL
            if (_url != null && string.Compare(name, "action", true) == 0)
            ...{
                value = _url;
            }
            base.WriteAttribute(name, value, encode);
        }
    }
    #endregion
    
    FormFixerHtmlTextWriter#region FormFixerHtmlTextWriter
    internal class FormFixerHtmlTextWriter : System.Web.UI.HtmlTextWriter
    ...{
        private string _url;
        internal FormFixerHtmlTextWriter(TextWriter writer):base(writer)
        ...{
            _url = HttpContext.Current.Request.RawUrl;
        }

        public override void WriteAttribute(string name, string value, bool encode)
        ...{
            if (_url != null && string.Compare(name, "action", true) == 0)
            ...{
                value = _url;
            }

            base.WriteAttribute(name, value, encode);
        }
    }
    #endregion

    #endregion
}