我在捕获
HTML输出的动作上有以下过滤器,将其转换为字符串,执行一些操作以修改字符串,并返回带有新字符串的ContentResult.不幸的是,我一直以一个空字符串结束.
private class Updatefilter : ActionFilterattribute { private Stream stream; public override void OnActionExecuting(ActionExecutingContext filterContext) { stream = filterContext.HttpContext.Response.Filter; stream = new MemoryStream(); filterContext.HttpContext.Response.Filter = stream; } public override void OnResultExecuted(ResultExecutedContext filterContext) { StreamReader responsereader = new StreamReader(filterContext.HttpContext.Response.Filter); //empty stream? why? responsereader.BaseStream.Position = 0; string response = responsereader.ReadToEnd(); ContentResult contres = new ContentResult(); contres.Content = response; filterContext.Result = contres; } }
我已经确定了StreamReader(stream).ReadToEnd()返回一个空字符串,但我无法弄清楚原因.
任何想法如何解决这一问题?
编辑:我已经将OnActionExecuted更改为OnResultExecuted,现在在生成View之后调用它,但是流仍然是空的!
解决方法
我通过劫持HttpWriter解决了这个问题,并将其写入StringBuilder而不是响应,然后在将其写入输出之前执行需要对响应执行的任何操作.
private class Updatefilter : ActionFilterattribute { private HtmlTextWriter tw; private StringWriter sw; private StringBuilder sb; private HttpWriter output; public override void OnActionExecuting(ActionExecutingContext filterContext) { sb = new StringBuilder(); sw = new StringWriter(sb); tw = new HtmlTextWriter(sw); output = (HttpWriter)filterContext.RequestContext.HttpContext.Response.Output; filterContext.RequestContext.HttpContext.Response.Output = tw; } public override void OnResultExecuted(ResultExecutedContext filterContext) { string response = sb.ToString(); //response processing output.Write(response); } }
原文地址:https://www.jb51.cc/csharp/100876.html
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