C＃从字符串获取字符的位置

Question

我的代码是这样的：

 string dex = "ABCD1234";
 string ch = "C";
 string ch1, ch2;
    if (dex.Contains(ch))
    {
       string n = Convert.ToChar(dex);
       MessageBox.Show(ch + "  is on " + n + " place and is between " + ch1 + " and " + ch2);
    }

我想将字符串转换为数组，但我做不到，也无法检索“ ch”字符串的位置及其之间的位置。

输出应为：

MessageBox.Show("C is on 3rd place and is between B and D");

Answer 1

string aS = "ABCDEFGHI";
char ch = 'C';
int idx = aS.IndexOf(ch);
MessageBox.Show(string.Format("{0} is in position {1} and between {2} and {3}", ch.ToString(), idx + 1, aS[idx - 1], aS[idx + 1]));

如果您的角色在零位置和其他一些条件下，这将无法处理，您必须弄清楚它们。