private static Expression SelectMultiple(Expression queryExpression, ResourceProperty property) { Type iEnumerableElement = BaseServiceProvider.GetIEnumerableElement(property.Type); ParameterExpression expression = Expression.Parameter(queryExpression.ElementType(), "element"); LambdaExpression selector = Expression.Lambda(Expression.ConvertChecked(Expression.Property(expression, property.Name), typeof(IEnumerable<>).MakeGenericType(new Type[] { iEnumerableElement })), new ParameterExpression[] { expression }); return queryExpression.QueryableSelectMany(selector); }
private static Expression SelectLateBoundPropertyMultiple(Expression queryExpression, ResourceProperty property) { Debug.Assert(queryExpression != null, "queryExpression != null"); Debug.Assert(property != null && property.Kind == ResourcePropertyKind.ResourceSetReference && !property.CanReflectOnInstanceTypeProperty, "property != null && property.Kind == ResourcePropertyKind.ResourceSetReference && !property.CanReflectOnInstanceTypeProperty"); Type enumerableElement = BaseServiceProvider.GetIEnumerableElement(property.Type); ParameterExpression parameter = Expression.Parameter(queryExpression.ElementType(), "element"); MethodInfo getter = DataServiceProviderMethods.GetSequenceValueMethodInfo.MakeGenericMethod(enumerableElement); Expression body = Expression.Call(null /*instance*/, getter, parameter, Expression.Constant(property)); LambdaExpression selector = Expression.Lambda(body, parameter); return queryExpression.QueryableSelectMany(selector); }
private static Expression SelectLateBoundPropertyMultiple(Expression queryExpression, ResourceProperty property) { Type iEnumerableElement = BaseServiceProvider.GetIEnumerableElement(property.Type); ParameterExpression expression = Expression.Parameter(queryExpression.ElementType(), "element"); MethodInfo method = DataServiceProviderMethods.GetSequenceValueMethodInfo.MakeGenericMethod(new Type[] { iEnumerableElement }); LambdaExpression selector = Expression.Lambda(Expression.Call(null, method, expression, Expression.Constant(property)), new ParameterExpression[] { expression }); return queryExpression.QueryableSelectMany(selector); }
private static Expression SelectMultiple(Expression queryExpression, ResourceProperty property) { Debug.Assert(queryExpression != null, "queryExpression != null"); Debug.Assert(property.Kind == ResourcePropertyKind.ResourceSetReference, "property == ResourcePropertyKind.ResourceSetReference"); Type enumerableElement = BaseServiceProvider.GetIEnumerableElement(property.Type); Debug.Assert(enumerableElement != null, "Providers should never expose a property as a resource-set if it doesn't implement IEnumerable`1."); ParameterExpression parameter = Expression.Parameter(queryExpression.ElementType(), "element"); UnaryExpression body = Expression.ConvertChecked( Expression.Property(parameter, property.Name), typeof(IEnumerable<>).MakeGenericType(enumerableElement)); LambdaExpression selector = Expression.Lambda(body, parameter); return queryExpression.QueryableSelectMany(selector); }