FormatJsonString

JsonFormatHelper.cs

    public static class JsonFormatHelper
    {
        private const string INDENT_STRING = "    ";
        public static string FormatJson(string str)
        {
            //if(ConfigHelper.GetAppSetting<bool>("Console", false))
                return FormatStrJson(str);            
            //return String.Empty;
        }
        public static string FormatStrJson(string str)
        {
            if (str != null)
            {
                var indent = 0;
                var quoted = false;
                var sb = new StringBuilder();
                for (var i = 0; i < str.Length; i++)
                {
                    var ch = str[i];
                    switch (ch)
                    {
                        case '{':
                        case '[':
                            sb.Append(ch);
                            if (!quoted)
                            {
                                sb.AppendLine();
                                Enumerable.Range(0, ++indent).ForEach(item => sb.Append(INDENT_STRING));
                            }
                            break;
                        case '}':
                        case ']':
                            if (!quoted)
                            {
                                sb.AppendLine();
                                Enumerable.Range(0, --indent).ForEach(item => sb.Append(INDENT_STRING));
                            }
                            sb.Append(ch);
                            break;
                        case '"':
                            sb.Append(ch);
                            bool escaped = false;
                            var index = i;
                            while (index > 0 && str[--index] == '\\')
                                escaped = !escaped;
                            if (!escaped)
                                quoted = !quoted;
                            break;
                        case ',':
                            sb.Append(ch);
                            if (!quoted)
                            {
                                sb.AppendLine();
                                Enumerable.Range(0, indent).ForEach(item => sb.Append(INDENT_STRING));
                            }
                            break;
                        case ':':
                            sb.Append(ch);
                            if (!quoted)
                                sb.Append(" ");
                            break;
                        default:
                            sb.Append(ch);
                            break;
                    }
                }
                
                // Fix (remove database laststamp and sequential fields from sb)
                string input = sb.ToString();
                string regex = "(\\s{4}\"laststamp\".*\n.*\n.*\n.*\n.*\n.*\n.*\n.*\n.*\n.*\\].*\n\\s*)|(\"sequential\".*\n\\s*)";                
                string output = Regex.Replace(input, regex, "");
                return output;
            }
            return String.Empty;
        }

    }

    static class Extensions
    {
        public static void ForEach<T>(this IEnumerable<T> ie, Action<T> action)
        {
            foreach (var i in ie)
            {
                action(i);
            }
        }
    }