Azure斑点和缩略图

问题描述

| 我有两个图像clear.jpg和thumbclear.jpg，第二个是缩略图使用以下代码从第一个创建：我尚未进行任何调整

  Bitmap bitmap = new Bitmap(File.InputStream);
  MemoryStream st = new MemoryStream();
  try
  {
     bitmap.Save(st,ImageFormat.Png);
     return st;
  }
  finally
  {
     bitmap.dispose();
  }

所以我将两个图片都上传到Blob，然后获取它们的URI并将其复制/粘贴到浏览器。第一个 http://127.0.0.1:10000/devstoreaccount1/media/e1a987d1-c731-4e26-9e6c-d7a63b62f661/clear.png 工作正常，但第二个http://127.0.0.1:10000/devstoreaccount1/media/b7ba6428-9db4-4282-8991-7a8198e7126f/thumbclear.png 给我以下错误：无法显示图像“ http：//...thumbclear.png \”，因为它包含错误。所以我认为这与要传输的位图有关。任何帮助将不胜感激。 **编辑我用来保存Blob的代码

public static CloudBlob SaveFiletoBlob(MemoryStream stream,string blobContainerName,string filename,string extension,string contentType,int fileSize)
        {
            if (stream != null)
            {
                CloudBlobContainer _BlobContainer = SessionHelper.GetBlobContainer(blobContainerName);
                var permissions = new BlobContainerPermissions();
                permissions.PublicAccess = BlobContainerPublicAccesstype.Container;
                _BlobContainer.SetPermissions(permissions);

                Guid blobid = Guid.NewGuid();
                var blob = _BlobContainer.GetBlobReference(blobid.ToString() + \"/\" + filename);
                blob.UploadFromStream(stream);

                blob.Metadata[\"FileName\"] = filename;
                blob.Metadata[\"Extension\"] = extension;
                blob.Metadata[\"FileSize\"] = fileSize.ToString();
                blob.SetMetadata();

                blob.Properties.ContentType = contentType;
                blob.SetProperties();

                return blob;
            }
            else
                return null;
        }

解决方法

解决方案是在上传到Blob之前将流位置设置为零。

stream.Position = 0;
blob.UploadFromStream(stream);

,对于第一个样本：

  Bitmap bitmap = new Bitmap(File.InputStream);
  MemoryStream st = new MemoryStream();
  try
  {
     bitmap.Save(st,ImageFormat.Png);


//worked for me
        Response.ContentType = \"image/png\";
        st.WriteTo(Response.OutputStream);
//--


  }
  finally
  {
     bitmap.Dispose();
  }

而且，我今天发现

Function Index() As FileContentResult
    Dim Resim = New WebClient().DownloadData(\"https://dosyalar.blob.core.windows.net/dosya/kartalisveris.gif\")
    Return New FileContentResult(Resim,\"image/png\") \'* With {.FileDownloadName = \"Höbölö\"}
End Function

azure azure 略图