CreateFromBlob crashing

[FFRainman]

When loading a blob from an Uri and passing it into CreateFromBlob it crashes with the following (weird) error:

System.Data.Services.Client.DataServiceClientException
<?xml version="1.0" encoding="utf-8"?><m:error xmlns:m="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata"><m:code /><m:message xml:lang="en-US">AssetFile ContentFileSize must not be negative</m:message></m:error>

Example code:

MediaServicesCredentials _cachedCredentials = new MediaServicesCredentials(_mediaServicesAccountName, _mediaServicesAccountKey);

CloudMediaContext _context = new CloudMediaContext(_cachedCredentials);
            
CloudBlockBlob cloudBlockBlob = new CloudBlockBlob(new Uri(model.BlobUri));                

// This row crashes
IAsset inputAsset = _context.Assets.CreateFromBlob(cloudBlockBlob, storageAccount.Credentials, AssetCreationOptions.None);

If I take the same CloudBlockBlob and use a MemoryStream to create it, it works, example:

var assetName = Path.GetFileNameWithoutExtension(cloudBlockBlob.Name);

IAsset inputAsset = _context.Assets.Create(assetName, AssetCreationOptions.None);

var assetFile = inputAsset.AssetFiles.Create(cloudBlockBlob.Name);

using (var memoryStream = new MemoryStream())
{
        cloudBlockBlob.DownloadToStream(memoryStream);
        memoryStream.Position = 0;
        assetFile.Upload(memoryStream);
}

[mconverti]

@FFRainman The CreateFromBlob extension tries to set the IAssetFile.ContentFileSize and IAssetFile.MimeType properties after successfully creating the asset based on the CloudBlockBlob.Properties of your source blob instance (see AssetBaseCollectionExtensions.cs#L522).

The problem is that CloudBlockBlob.Properties was not loaded after creating your source blob instance. Could you please try adding the following line of code before calling the CreateFromBlob extension?

cloudBlockBlob.FetchAttributes();

Hope it helps!
Mariano Converti
http://southworks.com/blog/author/mconverti/

[FFRainman]

@mconverti Perfect, that solves my problem!

Hopefully this piece of information can help others as well. :)

[skymanaditya1]

@mconverti I spent 2 hours trying to debug this on my own. I was using the CopyFromFile function and had to recently change it to CopyFromBlob but it was crashing with the exception similar to the one commented by @FFRainman . Hope this solution reaches its targeted audience.