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string str = "";
int leng = 0;
if (arr1.Length > arr2.Length)
leng = arr1.Length - (arr1.Length - arr2.Length);
else
leng = arr2.Length - (arr2.Length - arr1.Length);
str = new string[leng];
for (int i = 0; i < leng; i++)
{
//左右赋值这样写
arr1[i] = arr2[i];
//拼接这样写
str = arr1[i].ToString() + arr2[i].ToString();
}