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);
}
