我正在创建一个 Dictionary 对象,使用 IEnumerable
的 ToDictionary()
扩展方法:
I'm creating a Dictionary object, using IEnumerable
's ToDictionary()
extension method:
var dictionary = new Dictionary<string, MyType>
(myCollection.ToDictionary<MyType, string>(k => k.Key));
当它执行时,它会抛出以下ArgumentException
:
When it executes, it throws the following ArgumentException
:
已添加具有相同密钥的项目.
An item with the same key has already been added.
如何让它告诉我重复键是什么?
How do I get it to tell me what the duplicate key is?
获取重复键:
var duplicateKeys =
myCollection
.GroupBy(k => k.Key)
.Where(g => g.Count() > 1)
.Select(g => g.Key);
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