.Net HTTP POST FileStream /不使用MemoryStream

Question

HttpClient.PostAsync(uri, StreamContent) seems to use a MemoryStream behind the scenes even if I create StreamContent using a FileStream . Is there any way to HTTP POST a FileStream from .Net without using a MemoryStream ? Can I modify MS.Internal.InternalWebRequestStream.Write (see stack trace below) to not use a MemoryStream ?

Stack trace:

Exception of type 'System.OutOfMemoryException' was thrown. 

   at System.IO.MemoryStream.set_Capacity(Int32 value) 
   at System.IO.MemoryStream.EnsureCapacity(Int32 value) 
   at System.IO.MemoryStream.Write(Byte[] buffer, Int32 offset, Int32 count) 
   at MS.Internal.InternalWebRequestStream.Write(Byte[] buffer, Int32 offset, Int32 count) 
   at System.IO.Stream.<BeginWriteInternal>b__11(Object param0) 
   at System.Threading.Tasks.Task`1.InnerInvoke() 
   at System.Threading.Tasks.Task.Execute() 

Answer 1

解决方案是使用HttpWebRequest并按此处所述设置AllowWriteStreamBuffering = false 。