在VB.NET的List(Of String)中查找重复项 [英] Find duplicates in List(Of String) in VB.NET

问题描述

我有一个customers字符串列表，我试图在该列表上查找重复的客户.

I have a customers List(of String) on which I am trying to find the duplicate customers.

If Not customers.Count = customers.Distinct.ToList.Count Then
     customers = customers.Except(customers.Distinct.ToList)
End If

但是我得到以下异常:

InvalidCastException
Unable to cast object of type '<ExceptIterator>d__99`1[System.String]' to type

'System.Collections.Generic.List`1 [System.String]'.

'System.Collections.Generic.List`1[System.String]'.

这是在列表中查找重复项的正确方法吗?

Is this the right way to find duplicates in a list?

推荐答案

customers = customers.GroupBy(Function(m) m) _
                 .Where(Function(g) g.Count() > 1) _
                 .Select(Function(g) g.Key).ToList

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