當上傳位圖流Azure存儲，其存儲零/空圖像

Question

我使用下面的代碼從一個位圖圖像的MemoryStream上傳到我的微軟Azure存儲賬戶：

      MemoryStream memoryStream = new MemoryStream(); 

         img.Save(memoryStream, System.Drawing.Imaging.ImageFormat.Png); 

         blob.Properties.ContentType = model.File.ContentType; 
         blob.UploadFromStream(memoryStream); 

通過上面的代碼中使用，會發生什麼它是一個上傳空圖像Azure存儲:(！（我發現這個名字，但文件的大小是零！）！

 if (model.File != null && model.File.ContentLength > 0) 
       { 
        Bitmap original = null; 
        var name = "newimagefile"; 
        var errorField = string.Empty; 

        errorField = "File"; 
        name = Path.GetFileNameWithoutExtension(model.File.FileName); 
        original = Bitmap.FromStream(model.File.InputStream) as Bitmap; 
        if (original != null) 
        { 
         var img = CreateImage(original, model.X, model.Y, model.Width, model.Height); 



         CloudStorageAccount storageAccount = CloudStorageAccount.Parse(
            CloudConfigurationManager.GetSetting("StorageConnectionString")); 

         CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient(); 

         CloudBlobContainer container = blobClient.GetContainerReference("company"); // must always be lowercase 
               container.CreateIfNotExists(); 

         container.SetPermissions(
     new BlobContainerPermissions 
     { 
      PublicAccess = 
       BlobContainerPublicAccessType.Blob 
     }); 


         CloudBlockBlob blob = container.GetBlockBlobReference(imgName + ".png"); 

         MemoryStream memoryStream = new MemoryStream(); 

         img.Save(memoryStream, System.Drawing.Imaging.ImageFormat.Png); 

         blob.Properties.ContentType = model.File.ContentType; 
         blob.UploadFromStream(memoryStream); 

}

任何幫助，請！

Answer 1

我認爲您需要將位置設置回上傳之前的流的開始

img.Save(memoryStream, System.Drawing.Imaging.ImageFormat.Png); 
blob.Properties.ContentType = model.File.ContentType; 
memoryStream.Position = 0; 
blob.UploadFromStream(memoryStream);