c#数组转换成字符串的4种方法

方法1 

 //数组转换成字符串
 List<string> strArray=new List<string>() { "a1", "a2" , "a3"};
 List<int> intArray = new List<int>() { 1, 2, 3 };
 ($"strArray=={(",", strArray)}");
 ($"intArray=={(",", intArray)}"); 

方法2

int[] arr = { 1, 2, 3, 4, 5 };
string str = (",", (x => ()));
(str);

方法3：使用StringBuilder类

int[] arr = { 1, 2, 3, 4, 5 };
StringBuilder sb = new StringBuilder();
for (int i = 0; i < ; i++)
{
    (arr[i].ToString());
    if (i <  - 1)
    {
        (",");
    }
}
string str = ();
(str);

方法4：使用foreach循环

int[] arr = { 1, 2, 3, 4, 5 };
string str = "";
foreach (int num in arr)
{
    str += () + ",";
}
str = (',');
(str);