C# 把ABCD转换成数字

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每倒题得选项可能是多选或者单选。

 public static string LetterTransformationNum(string answer, int type)

        {

            string num = "";

            if (type == 1 || type == 2) //(1和2代表单选和多选)

            {

                var str = answer; //去答案

                str = TrimAllHtmlTag(str).Replace("】", "");

                StringBuilder sp = new StringBuilder();

                for (int i = 0; i < str.Length; i++)

                {

                    if (str[i] >= 'A' && str[i] <= 'G')

                    {

                        sp.Append((char)str[i] - 'A');

                    }

                    else

                    {

                        sp.Append(str[i]);

                    }

                }

                object numanswer = sp.ToString();

                num = Convert.ToString(numanswer);

            }

            num = String.Join(",", (from c in num select c + "").ToArray()); //加，

            string answerValue = "[" + num + "]";

            return answerValue;

        }

去掉一些特殊得字符正则

 public static string TrimAllHtmlTag(string str)

        {

            string reg = "<([^>]+?)>";

            return Regex.Replace(str, reg, "").Trim();

        }