回答編集履歴
1
\.ToList\(\) 追記
answer
CHANGED
|
@@ -4,5 +4,6 @@
|
|
|
4
4
|
var duplicationList = dataList
|
|
5
5
|
.GroupBy(i => i)
|
|
6
6
|
.Where(g => g.Count() > 1)
|
|
7
|
-
.Select(g => new { number = g.Key, duplicationCount = g.Count() -1 })
|
|
7
|
+
.Select(g => new { number = g.Key, duplicationCount = g.Count() -1 })
|
|
8
|
+
.ToList();
|
|
8
9
|
```
|