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Working with media

This topic describes how to work with media types and BLOB providers in Optimizely.

Media (such as files) are treated as any other content type, but have an associated binary data that is stored using BLOB providers, which are optimized for storing streams of data.

Examples

The following example defines a simple content type that is used in the examples that follow it:

[ContentType]
    public class GenericFile : MediaData
    {
        public string Description { get; set; }
    }

The following example creates a new file and defines a simple text file with the message Hello world:

public void Uploading_a_file()
    {
        var contentRepository = ServiceLocator.Current.GetInstance<IContentRepository>();
        var blobFactory = ServiceLocator.Current.GetInstance<IBlobFactory>();
    
        //Get a new empty file data
        var file1 = contentRepository.GetDefault<GenericFile>(SiteDefinition.Current.GlobalAssetsRoot);
        file1.Name = "Readme.txt";
    
        //Create a blob in the binary container
        var blob = blobFactory.CreateBlob(file1.BinaryDataContainer, ".txt");
        using (var s = blob.OpenWrite())
        {
            StreamWriter w = new StreamWriter(s);
            w.WriteLine("Hello world");
            w.Flush();
        }
    
        //Assign to file and publish changes
        file1.BinaryData = blob;
        var file1ID = contentRepository.Save(file1, SaveAction.Publish);
    }

The following example creates a location where the actual file type is resolved during runtime from extension:

public void Uploading_a_media_from_extension()
    {
        var contentRepository = ServiceLocator.Current.GetInstance<IContentRepository>();
        var contentTypeRepository = ServiceLocator.Current.GetInstance<IContentTypeRepository>();
        var mediaDataResolver = ServiceLocator.Current.GetInstance<ContentMediaResolver>();
        var blobFactory = ServiceLocator.Current.GetInstance<IBlobFactory>();
    
        //Get a suitable MediaData type from extension
        var mediaType = mediaDataResolver.GetFirstMatching(".txt");
        var contentType = contentTypeRepository.Load(mediaType);
    
        //Get a new empty file data
        var media = contentRepository.GetDefault<MediaData>(SiteDefinition.Current.GlobalAssetsRoot, contentType.ID);
        media.Name = "Readme.txt";
    
        //Create a blob in the binary container
        var blob = blobFactory.CreateBlob(media.BinaryDataContainer, ".txt");
        using (var s = blob.OpenWrite())
        {
            StreamWriter w = new StreamWriter(s);
            w.WriteLine("Hello world");
            w.Flush();
        }
    
        //Assign to file and publish changes
        media.BinaryData = blob;
        var file1ID = contentRepository.Save(media, SaveAction.Publish);
    }

The following example updates an existing file with new metadata:

public void UpdatingMetaData_of_a_file()
    {
        var contentRepository = ServiceLocator.Current.GetInstance<IContentRepository>();
        var blobFactory = ServiceLocator.Current.GetInstance<IBlobFactory>();
    
        //the file to update, not hardcoded of course
        var fileID = new ContentReference(444);
    
        //Get the file
        var file1 = contentRepository.Get<GenericFile>(fileID).CreateWritableClone() as GenericFile;
    
        //Update description
        file1.Description = "My description";
    
        //Publish
        var file1ID = contentRepository.Save(file1, SaveAction.Publish);
    
    }

The following example updates an existing file with new binary data:

public void UpdatingBinary_of_a_file()
    {
        var contentRepository = ServiceLocator.Current.GetInstance<IContentRepository>();
        var blobFactory = ServiceLocator.Current.GetInstance<IBlobFactory>();
    
        //the file to update, not hardcoded of course
        var fileID = new ContentReference(444);
    
        //Get the file
        var file1 = contentRepository.Get<GenericFile>(fileID).CreateWritableClone() as GenericFile;
    
        //Upload new blob
        var blob = blobFactory.CreateBlob(file1.BinaryDataContainer, ".txt");
        using (var s = blob.OpenWrite())
        {
            StreamWriter w = new StreamWriter(s);
            w.WriteLine("Hello world");
            w.Flush();
        }
    
        //Assign to file and publish changes
        file1.BinaryData = blob;
        var file1ID = contentRepository.Save(file1, SaveAction.Publish);
    }

See BLOB storage and providers to change storage model for media.


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