你能使用linq来查看两个IEnumerables数据是否包含任何公共条目？

Question

IEnumerable<fishbiscuits> a = GetFishBiscuits(0);
IEnumerable<fishbiscuits> b = GetFishBiscuits(1);

if ([any of the results in either list match])
{
 // Do something ie
 Console.WriteLine("I see both a and b love at least one of the same type of fish biscuit!");
}

Can you use linq to see if two IEnumerables of data contain any common entries?

Answer 1

是的，您可以使用Intersect和Any执行此操作：

bool anyCommonEntries = a.Intersect(b).Any();

Answer 2

public void Linq50()
{
    int[] numbersA = { 0, 2, 4, 5, 6, 8, 9 };
    int[] numbersB = { 1, 3, 5, 7, 8 };

    var commonNumbers = numbersA.Intersect(numbersB);

    Console.WriteLine("Common numbers shared by both arrays:");
    foreach (var n in commonNumbers)
    {
        Console.WriteLine(n);
    }
}

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From 101 Linq Samples - Intersect

Msdn documentation for Intersect

Extension Methods Roundup: Intersect, Union, AsNullable and GroupEvery