c# - Array in another bigger array including duplicates using Linq

Question

Example: Array1.Intersect(Array2) checks for only distinct elements.

Is there an elegant way using linq to get the result which contains even duplicates? The result should be case-insensitive. Thanks.

Answer 1

效率不高但很清楚：

var inboth = Array1.Where(Array2.Contains);

根据您不区分大小写的评论进行编辑：

inboth = Array1.Where(s => Array2.Contains(s, StringComparer.OrdinalIgnoreCase));

Answer 2

在您发表评论后，

var secondSet = new HashSet<string>(
    array2,
    StringComparer.CurrentCultureIgnoreCase);

var intersectSequence = array2.Where(secondSet.Contains);