c# 将checkedListBox选择的值保存再数组中并转换成以指定字符连接的字符串

经常忘记，所以记一下：

string[] arr =new string[3];
int b = 0;
foreach (string outstr in checkedListBox1.CheckedItems)
{
    arr[b] = outstr;
    b++;
}
string power = string.Join(",", arr).Trim(',');