C# Linq操作List或数组

Linq对数组操作分为合并、交集、差集等。

List<int> numbers1 = new List<int>() { 1, 3, 5 };

List<int> numbers2 = new List<int>() { 3,5,11, 13, 15 };

//合并排序

var newList = numbers1.Concat(numbers2).OrderBy(n => n);

foreach (var item in newList)

{

    Console.WriteLine(item);

}

//合并数组，并去除重复，排序

var newList = numbers1.Concat(from n in numbers2 where !numbers1.Contains(n) select n).OrderBy(n => n);

foreach (var item in newList)

{

    Console.WriteLine(item);

}

//合并，去重，排序

var newList = numbers1.Union(numbers2).OrderBy(n => n);

foreach (var item in newList)

{

    Console.WriteLine(item);

}

//取两个数组交集，排序

var newList = numbers1.Intersect(numbers2).OrderBy(n => n);

foreach (var item in newList)

{

    Console.WriteLine(item);

}

//取出数组1与数组2的差集，排序

var newList = numbers1.Except(numbers2).OrderBy(n => n);

foreach (var item in newList)

{

    Console.WriteLine(item);

}

//判断两个数组是否有交集

var exists = numbers1.Exists(delegate(int n)

{

    return numbers2.Exists(delegate(int i)

    {

        if (n == i)

            return true;

        else return false;

    });

});

Console.WriteLine(exists);