/// <summary>
/// Creates a new <see cref="FileChunkReader"/> instance.
/// </summary>
/// <param name="container">Must not be null.</param>
/// <returns>Never returns null.</returns>
public static FileChunkReader CreateFileChunkReader(this CompositionContainer container)
{
Contract.Requires(container != null);
Contract.Ensures(Contract.Result <FileChunkReader>() != null);
var context = container.GetService <ChunkFileContext>();
if (context == null)
{
throw new InvalidOperationException("File Context export was not found in the Composition Container.");
}
if (context.CompositionContainer == null)
{
context.CompositionContainer = container;
}
var reader = new FileChunkReader(context);
return(reader);
}