如果您的API方法期望使用，
HttpRequestMessage则可以从中提取流：
public HttpResponseMessage Put(HttpRequestMessage request){ var stream = GetStreamFromUploadedFile(request); // do something with the stream, then return something}private static Stream GetStreamFromUploadedFile(HttpRequestMessage request){ // Awaiting these tasks in the usual manner was deadlocking the thread for some reason. // So for now we're invoking a Task and explicitly creating a new thread. // See here: http://stackoverflow.com/q/15201255/328193 IEnumerable<HttpContent> parts = null; Task.Factory .StartNew(() => parts = request.Content.ReadAsMultipartAsync().Result.Contents, CancellationToken.None, TaskCreationOptions.LongRunning, TaskScheduler.Default) .Wait(); Stream stream = null; Task.Factory .StartNew(() => stream = parts.First().ReadAsStreamAsync().Result, CancellationToken.None, TaskCreationOptions.LongRunning, TaskScheduler.Default) .Wait(); return stream;}当使用张贴HTTP表单时，这对我有用
enctype="multipart/form-data"。
