在使用了URL重写的页面，我们为了保证用户进行PostBack后页面的URL仍然是,我们原先展现给用户的链接，比如是list_1.html而不是list.aspx?page=1
我们需要使用app_browsers目录，存放浏览器定义文件，相关说明可以参考msdn：http://msdn2.microsoft.com/zh-cn/library/ms228122(vs.80).aspx
<!--
可在 <windir>\Microsoft.NET\Framework\<ver>\CONFIG\Browsers 中找到现有的浏览器定义
-->
<browsers>
<browser refID="Default">
<controlAdapters>
<adapter controlType="System.Web.UI.HtmlControls.HtmlForm"
adapterType="FormRewriterControlAdapter" />
</controlAdapters>
</browser>
</browsers>
代码如下：
public class FormRewriterControlAdapter : System.Web.UI.Adapters.ControlAdapter
{
protected override void Render(HtmlTextWriter writer)
{
if (HttpContext.Current.Request.RawUrl.Contains(".html"))
{
base.Render(new RewriteFormHtmlTextWriter(writer));
}
else
{
base.Render(writer);
}
}
}
public class RewriteFormHtmlTextWriter : HtmlTextWriter
{
public RewriteFormHtmlTextWriter(Html32TextWriter writer)
: base(writer)
{
this.InnerWriter = writer.InnerWriter;
}
public RewriteFormHtmlTextWriter(System.IO.TextWriter writer)
: base(writer)
{
this.InnerWriter = writer;
}
public override void WriteAttribute(string name, string value, bool fEncode)
{
if (name == "action")
{
if (HttpContext.Current.Items["ActionAlreadyWritten"] == null)
{
value = HttpContext.Current.Request.RawUrl;
HttpContext.Current.Items["ActionAlreadyWritten"] = true;
}
}
base.WriteAttribute(name, value, fEncode);
}
}
以上代码一直运行了很长时间，但是后来在使用asp.net Ajax是发现URL重写后的页面会出现错误，重新修改代码，排除Asp.net Ajax请求进行处理，代码如下：
public class FormRewriterControlAdapter : System.Web.UI.Adapters.ControlAdapter
{
protected override void Render(HtmlTextWriter writer)
{
if (HttpContext.Current.Request.RawUrl.Contains(".html"))
{
//取得asp.net Ajax请求标志
var AsyncPost=HttpContext.Current.Request.Form["__ASYNCPOST"];
if (AsyncPost=="true") //判断是否asp.net Ajax请求
{
base.Render(writer);
}
else
{
base.Render(new RewriteFormHtmlTextWriter(writer));
}
}
else
{
base.Render(writer);
}
}
}
public class RewriteFormHtmlTextWriter : HtmlTextWriter
{
public RewriteFormHtmlTextWriter(Html32TextWriter writer)
: base(writer)
{
this.InnerWriter = writer.InnerWriter;
}
public RewriteFormHtmlTextWriter(System.IO.TextWriter writer)
: base(writer)
{
this.InnerWriter = writer;
}
public override void WriteAttribute(string name, string value, bool fEncode)
{
if (name == "action")
{
if (HttpContext.Current.Items["ActionAlreadyWritten"] == null)
{
value = HttpContext.Current.Request.RawUrl;
HttpContext.Current.Items["ActionAlreadyWritten"] = true;
}
}
base.WriteAttribute(name, value, fEncode);
}
}
后又经过调试发现是RewriteFormHtmlTextWriter的构造器有问题，没有包含htmlTextWriter类型的构造器，而使用了TextWriter类型构造器，导致页面结构错误出现null报错。再次调整代码如下：
public class FormRewriterControlAdapter : System.Web.UI.Adapters.ControlAdapter
{
protected override void Render(HtmlTextWriter writer)
{
if (HttpContext.Current.Request.RawUrl.Contains(".html"))
{
//使用过滤掉asp.net Ajax请求的方式避免错误
//而后发现是RewriteFormHtmlTextWriter的构造器的问题，遂放弃方法
//var AsyncPost=HttpContext.Current.Request.Form["__ASYNCPOST"];
//if (AsyncPost=="true")
//{
// base.Render(writer);
//}
//else
//{
// base.Render(new RewriteFormHtmlTextWriter(writer));
//}
base.Render(new RewriteFormHtmlTextWriter(writer));
}
else
{
base.Render(writer);
}
}
}
public class RewriteFormHtmlTextWriter : HtmlTextWriter
{
//使用html 4.0方式的渲染器
public RewriteFormHtmlTextWriter(HtmlTextWriter writer)
: base(writer)
{
this.InnerWriter = writer.InnerWriter;
}
//使用html 3.2方式的渲染器，兼容老浏览器
public RewriteFormHtmlTextWriter(Html32TextWriter writer)
: base(writer)
{
this.InnerWriter = writer.InnerWriter;
}
//其他方式浏览器，有可能引起null错误
public RewriteFormHtmlTextWriter(System.IO.TextWriter writer)
: base(writer)
{
this.InnerWriter = writer;
}
public override void WriteAttribute(string name, string value, bool fEncode)
{
if (name == "action")
{
if (HttpContext.Current.Items["ActionAlreadyWritten"] == null)
{
value = HttpContext.Current.Request.RawUrl;
HttpContext.Current.Items["ActionAlreadyWritten"] = true;
}
}
base.WriteAttribute(name, value, fEncode);
}
}
关于HtmlTextWriter和Html32TextWriter可以看一下这篇文章 http://www.cnblogs.com/Vegaslee/archive/2007/12/04/982723.html
此内容由惯性聚合(RSS阅读器)自动聚合整理，仅供阅读参考。 原文来自 — 版权归原作者所有。