示例

代码

    internal class Program
    {
        static void Main(string[] args)
        {
            List<int> list = new List<int>() { 1,2,3,4,5,6,7,8,9,10};
            string output1 = string.Join(",", list);
            Console.WriteLine(output1);
            string output2 = string.Join("\n", list);
            Console.WriteLine(output2);
            Console.ReadLine();
        }
    }

string.Join(",", list);

第一个参数按什么将数组每个元素分开

第二个参数为数组