还是数组拼接

Question

List<string> one = new List<string>{"0101","0202"};
List<string> target = new List<string>{"0505","0606","0707","0808","0909"};我希望得到的结果是01010505
01010606
01010707
01010808
0101090902020505
02020606
02020707
02020808
02020909我这样写的for (int i = 0; i < one.Count; i++)
{
    for (int n = 0; n <= 4; n++)
    {
         target[n].Union(one[i]);//没有出现红线，但没有效果
         grp[n].Concat(dan[i]);//出现红线
     }
}

Answer 1

List<string> one = new List<string> { "0101", "0202" };
List<string> target = new List<string> { "0505", "0606", "0707", "0808", "0909" };
foreach (string s in one)
foreach (string t in target)
Console.WriteLine(s + t);

Answer 2

List<string> one = new List<string> { "0101", "0202" };
            List<string> target = new List<string> { "0505", "0606", "0707", "0808", "0909" };            for (int i = 0; i < one.Count; i++)
            {
                for (int n = 0; n < target.Count; n++)
                {
                    Console.WriteLine(one[i] + target[n]);
                }
            }什么红线？

Answer 3

for (int i = 0; i < one.Count; i++)
{
    for (int n = 0; n <= 4; n++)
    {
        Console.WriteLine(one[i] + target[n]);
     }
}

Answer 4

List<string> one = new List<string>{"0101","0202",”0303","0404"};
List<string> target = new List<string>{"0505","0606","0707","0808","0909",
                                       "1515","1616","1717","1818","1919",
                                       "2525","2626","2727","2828","2929",
                                       "3535","3636","3737","3838","3939"};0505~0909与0101拼接
1515~1919与0202拼接
2525~2929与0303拼接
3535~3939与0404拼接

Answer 5

one.ForEach(o => {
    target.ForEach(t => {
        Console.WriteLine(o + t);
    });
});

Answer 6

var result = from o in one from t in target select (o+t);
foreach (var i in result) Console.WriteLine(i);
/*
01010505
01010606
01010707
01010808
01010909
02020505
02020606
02020707
02020808
02020909
*/