private Expression CreateCollectionInitializer(LambdaScope lambdaScope, PropertyInfo collectionProperty,
Type elementType, QueryLayer layer, LambdaScopeFactory lambdaScopeFactory)
{
MemberExpression propertyExpression = Expression.Property(lambdaScope.Accessor, collectionProperty);
var builder = new QueryableBuilder(propertyExpression, elementType, typeof(Enumerable), _nameFactory,
_resourceFactory, _resourceContextProvider, _entityModel, lambdaScopeFactory);
Expression layerExpression = builder.ApplyQuery(layer);
Type enumerableOfElementType = typeof(IEnumerable <>).MakeGenericType(elementType);
Type typedCollection = TypeHelper.ToConcreteCollectionType(collectionProperty.PropertyType);
ConstructorInfo typedCollectionConstructor = typedCollection.GetConstructor(new[]
{
enumerableOfElementType
});
if (typedCollectionConstructor == null)
{
throw new Exception(
$"Constructor on '{typedCollection.Name}' that accepts '{enumerableOfElementType.Name}' not found.");
}
return(Expression.New(typedCollectionConstructor, layerExpression));
}
private Expression CreateCollectionInitializer(LambdaScope lambdaScope, PropertyInfo collectionProperty, Type elementType, QueryLayer layer,
LambdaScopeFactory lambdaScopeFactory)
{
MemberExpression propertyExpression = Expression.Property(lambdaScope.Accessor, collectionProperty);
var builder = new QueryableBuilder(propertyExpression, elementType, typeof(Enumerable), _nameFactory, _resourceFactory, _resourceContextProvider,
_entityModel, lambdaScopeFactory);
Expression layerExpression = builder.ApplyQuery(layer);
// Earlier versions of EF Core 3.x failed to understand `query.ToHashSet()`, so we emit `new HashSet(query)` instead.
// Interestingly, EF Core 5 RC1 fails to understand `new HashSet(query)`, so we emit `query.ToHashSet()` instead.
// https://github.com/dotnet/efcore/issues/22902
if (EntityFrameworkCoreSupport.Version.Major < 5)
{
Type enumerableOfElementType = typeof(IEnumerable <>).MakeGenericType(elementType);
Type typedCollection = CollectionConverter.ToConcreteCollectionType(collectionProperty.PropertyType);
ConstructorInfo typedCollectionConstructor = typedCollection.GetConstructor(enumerableOfElementType.AsArray());
if (typedCollectionConstructor == null)
{
throw new InvalidOperationException($"Constructor on '{typedCollection.Name}' that accepts '{enumerableOfElementType.Name}' not found.");
}
return(Expression.New(typedCollectionConstructor, layerExpression));
}
string operationName = CollectionConverter.TypeCanContainHashSet(collectionProperty.PropertyType) ? "ToHashSet" : "ToList";
return(CopyCollectionExtensionMethodCall(layerExpression, operationName, elementType));
}
