在内存中创建FileStream而不是在磁盘上保存物理文件

Question

I am uploading a file to an api, and I have to copy my requestStream to a FileStream in order to post the file to the API. My code below works, but I have to save the file to a temp folder to create the FileStream, and then I have to clean up the temp folder again after the operation. Is there a cleaner way of doing that - eg creating the FileStream in memory (if that's possible) instead of saving it to the disk?

Stream requestStream = await Request.Content.ReadAsStreamAsync();

     //Create filestream by making a temporary physical file
     using (FileStream fileStream = System.IO.File.Create(@"C:\tempFolder\" fileName))                                     
     {
         await requestStream.CopyToAsync(fileStream);
         var postedFile = ms.CreateMedia(fileName, folder.Id, "file");                                    
         postedFile.SetValue("umbracoFile", fileName, fileStream);                                      
         ms.Save(postedFile);
     }

     // Clean up
     if ((System.IO.File.Exists(@"C:\tempFolder\" + fileName)))
     {
         System.IO.File.Delete(@"C:\tempFolder\" + fileName);
     }

Answer 1

Why not use the requestStream directly? It is an instance of Stream and your API end point expects an instance of Stream , there is no need to copy the content of requestStream to any intermediary point unless you want to add unnecessary overhead.

Stream requestStream = await Request.Content.ReadAsStreamAsync();

var postedFile = ms.CreateMedia(fileName, folder.Id, "file");
postedFile.SetValue("umbracoFile", fileName, requestStream);
ms.Save(postedFile);

Answer 2

.Net doesn't really provide a good in-memory solution. It is good to create your own to save resources and encapsulate more functionality.

Check out this guide here