[英]How to sort a list by values which can only be gained during the sort process?
public class MyClass
{
public int X { get; }
public int GetSomeValue(List<MyClass> values)
{
return valueOfOperation;
}
}
Let's say I have a List<MyClass>
.假设我有一个
List<MyClass>
。 I want to sort it by property X. If there are multiple objects with same value of X, I want to sort those by GetSomeValue(objectsWithSameXValue)
which returns a value of some operation.我想按属性 X 对其进行排序。如果有多个具有相同 X 值的对象,我想通过
GetSomeValue(objectsWithSameXValue)
对它们进行排序,它返回某个操作的值。 Said return value is calculated using all objects with equal value of X.所述返回值是使用具有相等 X 值的所有对象计算的。
Desired result should look like this:所需的结果应如下所示:
Object Property X GetSomeValue({item2, item3, item4})
item1 1
item2 3 2
item3 3 3
item4 3 9
item5 4
Everything is sorted by X. Item2, item3 and item4 are also sorted by GetSomeValue().一切都按 X 排序。Item2、item3 和 item4 也按 GetSomeValue() 排序。
Is there anything I can do without huge if...else trees?如果没有巨大的 if...else 树木,我能做些什么吗? I tried different approaches, but sooner or later I got lost because it became confusing.
我尝试了不同的方法,但迟早我迷路了,因为它变得混乱。
I would try doing the following:我会尝试执行以下操作:
GetSomeValue(group)
GetSomeValue(group)
对每个组中的值进行排序items.GroupBy(item => item.X)
.OrderBy(group => group.Key)
.SelectMany(group => group.OrderBy(item => item.GetSomeValue(group)))
.ToList()
I'd suggest changing GetSomeValue(List<MyClass> values)
to GetSomeValue(IEnumerable<MyClass> values)
if you have the option, so you don't have to call .ToList()
repeatedly.如果您可以选择,我建议将
GetSomeValue(List<MyClass> values)
更改为GetSomeValue(IEnumerable<MyClass> values)
,这样您就不必重复调用.ToList()
了。
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