Read a delta from a custom media type formatter... if a bit naughty.

gistfile1.cs

ODataConventionModelBuilder builder = new ODataConventionModelBuilder();
builder.EntitySet<EfContext>("EfContext");
IEdmModel model = builder.GetEdmModel();
var odataFormatters = ODataMediaTypeFormatters.Create(model);

var delta = content.ReadAsAsync(type, odataFormatters).Result;