public static class GenericSorter
{
public static IOrderedEnumerable<T> Sort<T>(IEnumerable<T> toSort, Dictionary<string, SortingOrder> sortOptions)
{
IOrderedEnumerable<T> orderedList = null;
foreach (KeyValuePair<string, SortingOrder> entry in sortOptions)
{
if (orderedList != null)
{
if (entry.Value == SortingOrder.Ascending)
{
orderedList = orderedList.ApplyOrder<T>(entry.Key, "ThenBy");
}
else
{
orderedList = orderedList.ApplyOrder<T>(entry.Key, "ThenByDescending");
}
}
else
{
if (entry.Value == SortingOrder.Ascending)
{
orderedList = toSort.ApplyOrder<T>(entry.Key, "OrderBy");
}
else
{
orderedList = toSort.ApplyOrder<T>(entry.Key, "OrderByDescending");
}
}
}
return orderedList;
}
private static IOrderedEnumerable<T> ApplyOrder<T>(this IEnumerable<T> source, string property, string methodName)
{
ParameterExpression param = Expression.Parameter(typeof(T), "x");
Expression expr = param;
foreach (string prop in property.Split('.'))
{
expr = Expression.PropertyOrField(expr, prop);
}
Type delegateType = typeof(Func<,>).MakeGenericType(typeof(T), expr.Type);
LambdaExpression lambda = Expression.Lambda(delegateType, expr, param);
MethodInfo mi = typeof(Enumerable).GetMethods().Single(
method => method.Name == methodName
&& method.IsGenericMethodDefinition
&& method.GetGenericArguments().Length == 2
&& method.GetParameters().Length == 2)
.MakeGenericMethod(typeof(T), expr.Type);
return (IOrderedEnumerable<T>)mi.Invoke(null, new object[] { source, lambda.Compile() });
}
}
你不應該繼承IEquatable的LINQ? – Manatherin 2012-08-09 09:46:05
請發佈您的'IComparable'執行。 –
Ani
2012-08-09 10:19:39
歡迎來到SO,Mike。我根據[常見問題](http://stackoverflow.com/faq)從問題中刪除了您的姓名。如果「Mike」確實是你的名字,你可能想在[你的個人資料](http://stackoverflow.com/users/1587065)中使用它,而不是無聊的_user1587065_。 – 2012-08-09 11:36:10