Question

我需要向Request.Form集合添加值，但我不明白如何使用指定的表单值初始化HttpRequest实例。我试图在控制器中覆盖Initialize方法并初始化HttpRequest，如下所示：

protected override void Initialize(System.Web.Routing.RequestContext requestContext)
{
   var requestField = typeof (HttpRequestWrapper).GetField("_httpRequest", BindingFlags.NonPublic |
                                                                               BindingFlags.Instance);
   var responseField = typeof(HttpResponseWrapper).GetField("_httpResponse", BindingFlags.NonPublic | BindingFlags.Instance);


   var req = (HttpRequest) requestField.GetValue(requestContext.HttpContext.Request);
   var res = (HttpResponse)responseField.GetValue(requestContext.HttpContext.Response);
//**************** HERE I TRY TO INITIZLIZE FORM COLLECTION WITH MY VALUE 'additional_form_value' but nothing  
   var newReq = new HttpRequest(null, req.Url.ToString(), "?additional_form_value=test");
   newReq.RequestType = "POST";
//***************


   var r = new RequestContext(new HttpContextWrapper(new HttpContext(newReq, res)), requestContext.RouteData);


   base.Initialize(r);
}

有没有办法将新项目添加到Request.Form收藏？

编辑：

当我尝试这种方法时，我得到了一个异常（对象引用未设置为对象的实例。）：

NameValueCollection oQuery = requestContext.HttpContext.Request.QueryString;
oQuery = (NameValueCollection)requestContext.HttpContext.Request.GetType().GetField("_form", BindingFlags.NonPublic | BindingFlags.Instance).GetValue(requestContext.HttpContext.Request); //exception here
PropertyInfo oReadable = oQuery.GetType().GetProperty("IsReadOnly", BindingFlags.NonPublic | BindingFlags.Instance);
oReadable.SetValue(oQuery, false, null);
oQuery["foo"] = "bar";
oReadable.SetValue(oQuery, true, null);

Answer 1

在将数据添加到帖子之前构建您的数据。

您需要将数据添加到请求的流中，这样可以起作用：

using(HttpWebRequest myHttpRequest = (HttpWebRequest)WebRequest.Create(myUrl)
{
   byte[] bytes = Encoding.UTF8.GetBytes(myFormData);
   Stream requestStream = null;
   try
   {
      myHttpRequest.ContentLength = bytes.Length;
      requestStream = myHttpRequest.GetRequestStream();
      requestStream.Write(bytes, 0, bytes.Length);
   }
}

您可能需要更改编码类型，但希望这可以帮助您，除非我的问题完全错误。

如何向Request.Form集合添加值

1 个答案: