/// <summary>
/// Retrieve the single <paramref name="contract"/> instance from the
/// <see cref="CompositionContext"/>.
/// </summary>
/// <param name="contract">The contract to retrieve.</param>
/// <returns>An instance of the export.</returns>
/// <param name="export">The export if available, otherwise, null.</param>
/// <exception cref="CompositionFailedException" />
public override bool TryGetExport(CompositionContract contract, out object export)
{
ExportDescriptor defaultForExport;
if (!_partRegistry.TryGetSingleForExport(contract, out defaultForExport))
{
export = null;
return(false);
}
export = CompositionOperation.Run(this, defaultForExport.Activator);
return(true);
}
