Dmitriyq

public static IOrderedQueryable<TSource> OrderByAscOrDesc<TSource>(this IQueryable<TSource> query, string propName, bool isDesc)
{
	var entityType = typeof(TSource);
	var propInfo = entityType.GetProperty(propName);
	if (propInfo.DeclaringType != entityType)
		propInfo = propInfo.DeclaringType.GetProperty(propName);

	if (propInfo == null) return (IOrderedQueryable<TSource>)query;

	var arg = Expression.Parameter(entityType, "x");
	var property = Expression.MakeMemberAccess(arg, propInfo);
	var selector = Expression.Lambda(property, new ParameterExpression[] { arg });

	var methodName = isDesc ? "OrderByDescending" : "OrderBy";
	var method = typeof(Queryable).GetMethods()
		.Where(x => x.Name == methodName && x.IsGenericMethodDefinition)
		.Where(x => x.GetParameters().Length == 2)
		.Single();

	var genericMethod = method.MakeGenericMethod(entityType, propInfo.PropertyType);
	return (IOrderedQueryable<TSource>)genericMethod.Invoke(genericMethod, new object[] { query, selector });
}