/// <summary>
/// Find ItemType from given type representing many imports.
/// </summary>
/// <param name="manyType">Many imports representation.</param>
/// <returns>ItemType if found according to MEF rules, null otherwise.</returns>
private static TypeDescriptor findManyItemDescriptor(InheritanceChain manyType)
{
var signature = manyType.Path.Signature;
if (signature == TypeDescriptor.IEnumerableSignature)
{
//type is IEnumerable
return(manyType.Type.Arguments.First());
}
if (signature == TypeDescriptor.ArraySignature)
{
//type is Array
return(manyType.Type.Arguments.First());
}
return(findICollectionItemDescriptor(manyType));
}
/// <summary>
/// Find ItemType from given type representing many imports in ICollection{}.
/// </summary>
/// <param name="manyType">Many imports representation.</param>
/// <returns>ItemType if found within ICollection according to MEF rules, null otherwise.</returns>
private static TypeDescriptor findICollectionItemDescriptor(InheritanceChain manyType)
{
var signature = manyType.Path.Signature;
if (signature == TypeDescriptor.ICollectionSignature)
{
//type is ICollection
return(manyType.Type.Arguments.First());
}
foreach (var subchain in manyType.SubChains)
{
var descriptor = findICollectionItemDescriptor(subchain);
if (descriptor != null)
{
return(descriptor);
}
}
return(null);
}