private Expression RewritePropertyAccess(
Expression expression,
IReadOnlyList <IPropertyBase> properties,
IQuerySource querySource)
{
if (querySource != null &&
properties.Count > 0 &&
properties.All(p => p is INavigation) &&
properties[properties.Count - 1] is INavigation lastNavigation &&
lastNavigation.IsCollection())
{
var qsre = new QuerySourceReferenceExpression(querySource);
CollectionNavigationIncludeResultOperators.Add(
new IncludeResultOperator(properties.Cast <INavigation>().ToArray(), qsre));
var parameter = Expression.Parameter(querySource.ItemType, querySource.ItemName);
var accessorBody = BuildCollectionAccessorExpression(parameter, properties);
var emptyCollection = lastNavigation.GetCollectionAccessor().Create();
return(Expression.Call(
ProjectCollectionNavigationMethodInfo
.MakeGenericMethod(querySource.ItemType, expression.Type),
qsre,
Expression.Lambda(
Expression.Coalesce(
accessorBody,
Expression.Constant(emptyCollection, accessorBody.Type)),
parameter)));
}
return(expression);
}
private Expression RewritePropertyAccess(
Expression expression,
IReadOnlyList <IPropertyBase> properties,
IQuerySource querySource)
{
if (querySource != null &&
properties.Count > 0 &&
properties.All(p => p is INavigation) &&
properties[properties.Count - 1] is INavigation lastNavigation &&
lastNavigation.IsCollection())
{
// include doesn't handle navigations on derived class, so we can't leverage include pipeline for those cases
var expectedCallerType = querySource.ItemType;
foreach (var property in properties)
{
if (expectedCallerType != property.DeclaringType.ClrType)
{
return(expression);
}
expectedCallerType = property.ClrType;
}
var qsre = new QuerySourceReferenceExpression(querySource);
CollectionNavigationIncludeResultOperators.Add(
new IncludeResultOperator(properties.Cast <INavigation>().ToArray(), qsre));
var parameter = Expression.Parameter(querySource.ItemType, querySource.ItemName);
var accessorBody = BuildCollectionAccessorExpression(parameter, properties);
var emptyCollection = lastNavigation.GetCollectionAccessor().Create();
return(Expression.Call(
ProjectCollectionNavigationMethodInfo
.MakeGenericMethod(querySource.ItemType, expression.Type),
qsre,
Expression.Lambda(
Expression.Coalesce(
accessorBody,
Expression.Constant(emptyCollection, accessorBody.Type)),
parameter)));
}
return(expression);
}
