上传文件到服务器，抛出内存异常。

I am trying to implement a file upload system with asp.net web api and I am running into a problem. I am trying to get the multipart form data into a memory stream so it can be written to either disk or blob storage depending on the service layer implementation. The problem is it works fine for small files but I am trying to upload a file of 291 MB and it is throwing an out of memory exception. Here is the code:I am trying to implement a file upload system w