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using System;
using System.Linq;
using System.Linq.Expressions;
using System.Runtime.CompilerServices;
namespace Gestor.Application.Helpers
{
public static class QueryableHelper
{
public static IOrderedQueryable<T> OrderBy<T>(this IQueryable<T> source, string propertyName)
{
return source.OrderBy<T, object>(QueryableHelper.ToLambda<T>(propertyName));
}
public static IOrderedQueryable<T> OrderByDescending<T>(this IQueryable<T> source, string propertyName)
{
return source.OrderByDescending<T, object>(QueryableHelper.ToLambda<T>(propertyName));
}
private static Expression<Func<T, object>> ToLambda<T>(string propertyName)
{
ParameterExpression parameterExpression = Expression.Parameter(typeof(T));
return Expression.Lambda<Func<T, object>>(Expression.Convert(Expression.Property(parameterExpression, propertyName), typeof(object)), new ParameterExpression[] { parameterExpression });
}
}
}
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