public static IOrderedQueryable <T> OrderBy <T>(this IQueryable <T> query, SortableParams parameters)
{
var type = typeof(T);
var param = Expression.Parameter(type, "x");
var pi = GetProperty(type, parameters.OrderByField);
var expr = Expression.Property(param, pi);
var propertyType = pi.PropertyType;
var delegateType = typeof(Func <,>).MakeGenericType(type, propertyType);
var lambda = Expression.Lambda(delegateType, expr, param);
var method = GetOrderByMethod(parameters.OrderByAscending);
return((IOrderedQueryable <T>)method.MakeGenericMethod(type, propertyType)
.Invoke(null, new object[] { query, lambda }));
}
public static IOrderedQueryable <TEntity> OrderBy <TEntity>(this IQueryable <TEntity> query, SortableParams sortableParams)
{
var elemType = typeof(TEntity);
var parameter = Expression.Parameter(elemType);
var prop = elemType.GetProperty(sortableParams.OrderByField);
var expPropertryOrField = Expression.Property(parameter, prop.Name);
var genType = typeof(Func <,>).MakeGenericType(elemType, prop.PropertyType);
var selector = Expression.Lambda(expPropertryOrField, parameter);
var orderBy = sortableParams.OrderByDesceding ? "OrderByDescending" : "OrderBy";
var orderByExpression = Expression.Call(typeof(Queryable),
orderBy,
new[] { elemType, prop.PropertyType },
query.Expression,
selector
);
return((IOrderedQueryable <TEntity>)query.Provider.CreateQuery <TEntity>(orderByExpression));
}
