Question

我有一个string[] includes = { "PlayList", "PlayListSong" }; var playLists =_unitOfWork.PlayListSongRepository.GetWithMultipleInclude( e => e.UserId==userId,includes ).Select(x=>x.PlayList).ToList(); /// <summary> /// Inclue multiple /// </summary> /// <param name="predicate"></param> /// <param name="include"></param> /// <returns></returns> public IEnumerable<TEntity> GetWithMultipleInclude( System.Linq.Expressions.Expression<Func<TEntity, bool>> predicate, string[] include) { IQueryable<TEntity> query = this.DbSet; foreach (string inc in include) { query = query.Include(inc); } return query.Where(predicate).ToList<TEntity>() ; }对象，我通过覆盖某个第三方库上的方法获得。其中包含一些我想要删除和替换的数据。有没有办法可以读取HttpWebRequest对象的内容，做一些替换，然后再写回来？我覆盖的方法允许您在尝试使用它来获取响应之前修改请求对象。

我知道我可以将字节写入HttpWebRequest，但我仍然坚持如何阅读它。我想做这样的事，但我做不到。

HttpWebRequest

Answer 1

我担心这种方法不起作用，理由是，

如果你看一下HttpWebRequest.cs

的第1490行

        /// <devdoc>
        /// <para>Gets a <see cref='System.IO.Stream'/> that the application can use to write request data.
        ///    This property returns a stream that the calling application can write on.
        ///    This property is not settable.  Getting this property may cause the
        ///    request to be sent, if it wasn't already. Getting this property after
        ///    a request has been sent that doesn't have an entity body causes an
        ///    exception to be thrown.
        ///</para>
        /// </devdoc>
        public Stream GetRequestStream(out TransportContext context) {

它说明一旦你收到财产请求就会被发送。这意味着您将无法修改它。作为示例，您可以尝试以下代码

            var postData = "thing1=hello";
            postData += "&thing2=world";
            var data = Encoding.ASCII.GetBytes(postData);

            var request = (HttpWebRequest)WebRequest.Create("https://www.google.com.au/");
            request.Method = "POST";
            request.ContentType = "application/x-www-form-urlencoded";
            request.ContentLength = data.Length;

            using (var stream = request.GetRequestStream())
            {
                stream.Write(data, 0, data.Length);
            }

            using (var stream = request.GetRequestStream())
            {
                stream.Write(data, 0, data.Length);
            }

第二个stram.Write将失败。

你可以使用像Fiddler.Core这样的东西来实现你所需要的。

Answer 2

简单回答：你不能。
详细答案：

HttpWebRequest.GetRequestStream最终会打开与远程主机的套接字连接。您写入请求流的所有内容都将发送给主机。

换句话说，请求正文不会存储在本地如果某个第三方图书馆已经创建了请求并填充了其正文，则已将正文发送给主持人。

您所能做的就是联系图书馆所有者以更新图书馆API。

如何修改HttpWebRequest对象的请求主体？

2 个答案: