/// <summary>
/// Returns the export definitions that match the constraint defined by the specified definition.
/// </summary>
/// <param name="definition">
/// The <see cref="ImportDefinition"/> that defines the conditions of the
/// <see cref="ExportDefinition"/> objects to return.
/// </param>
/// <returns>
/// An <see cref="IEnumerable{T}"/> of <see cref="Tuple{T1, T2}"/> containing the
/// <see cref="ExportDefinition"/> objects and their associated
/// <see cref="ComposablePartDefinition"/> for objects that match the constraint defined
/// by <paramref name="definition"/>.
/// </returns>
/// <exception cref="ArgumentNullException">
/// <paramref name="definition"/> is <see langword="null"/>.
/// </exception>
/// <exception cref="ObjectDisposedException">
/// The <see cref="DirectoryCatalog"/> has been disposed of.
/// </exception>
public override IEnumerable <Tuple <ComposablePartDefinition, ExportDefinition> > GetExports(ImportDefinition definition)
{
ThrowIfDisposed();
Requires.NotNull(definition, "definition");
return(InnerCatalog.GetExports(definition));
}
public void GetExports()
{
using (var directory = CreateTemporaryDirectory())
{
var catalog = new AggregateCatalog();
Expression<Func<ExportDefinition, bool>> constraint = (ExportDefinition exportDefinition) => exportDefinition.ContractName == AttributedModelServices.GetContractName(typeof(MyExport));
IEnumerable<Tuple2<ComposablePartDefinition, ExportDefinition>> matchingExports = null;
matchingExports = catalog.GetExports(constraint);
Assert.IsNotNull(matchingExports);
Assert.IsTrue(matchingExports.Count() == 0);
var testsDirectoryCatalog = new DirectoryCatalog(directory.DirectoryPath);
catalog.Catalogs.Add(testsDirectoryCatalog);
matchingExports = catalog.GetExports(constraint);
Assert.IsNotNull(matchingExports);
Assert.IsTrue(matchingExports.Count() >= 0);
IEnumerable<Tuple2<ComposablePartDefinition, ExportDefinition>> expectedMatchingExports = catalog.Parts
.SelectMany(part => part.ExportDefinitions, (part, export) => new Tuple2<ComposablePartDefinition, ExportDefinition>(part, export))
.Where(partAndExport => partAndExport.Item2.ContractName == AttributedModelServices.GetContractName(typeof(MyExport)));
Assert.IsTrue(matchingExports.SequenceEqual(expectedMatchingExports));
catalog.Catalogs.Remove(testsDirectoryCatalog);
matchingExports = catalog.GetExports(constraint);
Assert.IsNotNull(matchingExports);
Assert.IsTrue(matchingExports.Count() == 0);
}
}
