C#中 如何处理 JSON中的特殊字符

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public static String StringToJson(String s)        {            StringBuilder sb = new StringBuilder();            for (int i = 0; i < s.Length; i++)            {                char c = s[i];                switch (c)                {                    case '\"':                        sb.Append("\\\"");                        break;                    case '\\':                        sb.Append("\\\\");                        break;                    case '/':                        sb.Append("\\/");                        break;                    case '\b':                        sb.Append("\\b");                        break;                    case '\f':                        sb.Append("\\f");                        break;                    case '\n':                        sb.Append("\\n");                        break;                    case '\r':                        sb.Append("\\r");                        break;                    case '\t':                        sb.Append("\\t");                        break;                    default:                        sb.Append(c);                        break;                }            }            return sb.ToString();        }