/// <summary>
///
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="queryable"></param>
/// <param name="propName"> Property.Property such as User.Name </param>
/// <param name="direction"></param>
/// <returns></returns>
public static IOrderedQueryable <T> OrderBy <T>(this IQueryable <T> queryable, string propName, SortDirection direction) where T : class
{
var keySelector = ObjectExtension.BuildGetter <T>(propName);
string methodName = direction == SortDirection.Ascending ? "OrderBy" : "OrderByDescending";
MethodCallExpression methodCall = Expression.Call(typeof(Queryable), methodName, new Type[] { typeof(T), (keySelector as LambdaExpression).ReturnType }, queryable.Expression, Expression.Quote(keySelector));
return((IOrderedQueryable <T>)queryable.Provider.CreateQuery <T>(methodCall));
}
/// <summary>
///
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="enumerable"></param>
/// <param name="propName"> Property.Property such as User.Name </param>
/// <param name="direction"></param>
/// <returns></returns>
public static IOrderedEnumerable <T> ThenBy <T>(this IOrderedEnumerable <T> enumerable, string propName, SortDirection direction) where T : class
{
LambdaExpression keySelector = ObjectExtension.BuildGetter <T>(propName);
string methodName = direction == SortDirection.Ascending ? "ThenBy" : "ThenByDescending";
MethodInfo method = typeof(Enumerable).GetMethods().Single(a => a.Name == methodName && a.IsGenericMethodDefinition && a.GetGenericArguments().Length == 2 && a.GetParameters().Length == 2)
.MakeGenericMethod(typeof(T), keySelector.ReturnType);
return((IOrderedEnumerable <T>)method.Invoke(null, new object[] { enumerable, keySelector.Compile() }));
}
