数组怎么拼接呢

数组如何拼接呢？

C# code

List<string>  one = new List<string>{"0102","0103","0104"};List<string>  target = new List<string>{"0506070809"};

怎么拼接呢？

C# code

for (int i = 0; i < one.Count; i++){     target.Union(one[i]);      target.Concat(one[i]);}

两种写法都不对，正确的写法是什么呢？谢谢

[解决办法]
target = one.Concat(target).ToList();
[解决办法]
List<string> one = new List<string>{"0102","0103","0104"};
List<string> target = new List<string>{"0506070809"};
string result = string.Join("", one.Concat(target).ToArray());

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