System.Data.Entity.Core.Objects.ELinq.ExpressionConverter.TryGetValueLayerType C# (CSharp) Method

        private bool TryGetValueLayerType(Type linqType, out TypeUsage type)
        {
            // Remove nullable
            var nonNullableType = TypeSystem.GetNonNullableType(linqType);

            // Enum types are only supported for EDM V3 and higher, do not force loading
            // enum types for previous versions of EDM
            if (nonNullableType.IsEnum() && this.EdmItemCollection.EdmVersion < XmlConstants.EdmVersionForV3)
            {
                nonNullableType = nonNullableType.GetEnumUnderlyingType();
            }

            // See if this is a primitive type
            PrimitiveTypeKind primitiveTypeKind;
            if (ClrProviderManifest.TryGetPrimitiveTypeKind(nonNullableType, out primitiveTypeKind))
            {
                type = EdmProviderManifest.Instance.GetCanonicalModelTypeUsage(primitiveTypeKind);
                return true;
            }

            // See if this is a collection type (if so, recursively resolve)
            var elementType = TypeSystem.GetElementType(nonNullableType);
            if (elementType != nonNullableType)
            {
                TypeUsage elementTypeUsage;
                if (TryGetValueLayerType(elementType, out elementTypeUsage))
                {
                    type = TypeHelpers.CreateCollectionTypeUsage(elementTypeUsage);
                    return true;
                }
            }

            // Ensure the metadata for this object type is loaded
            _perspective.MetadataWorkspace.ImplicitLoadAssemblyForType(linqType, null);

            if (!_perspective.TryGetTypeByName(nonNullableType.FullNameWithNesting(), false, out type))
            {
                // If the user is casting to a type that is not a model type or a primitive type it can be a cast to an enum that
                // is not in the model. In that case we use the underlying enum type. 
                // Note that if the underlying type is not any of the EF primitive types we will fail with and InvalidCastException.
                // This is consistent with what we would do when seeing a cast to a primitive type that is not a EF valid primitive 
                // type (e.g. ulong).
                if (nonNullableType.IsEnum()
                    && ClrProviderManifest.TryGetPrimitiveTypeKind(nonNullableType.GetEnumUnderlyingType(), out primitiveTypeKind))
                {
                    type = EdmProviderManifest.Instance.GetCanonicalModelTypeUsage(primitiveTypeKind);
                }
            }

            return type != null;
        }