using System.Collections.Generic; using System.Text; namespace Facebook.Utility { /// <summary> /// JSON (JavaScript Object Notation) Utility Methods. /// </summary> public static class JSONHelper { ///<summary> /// Converts a Dictionary to a JSON-formatted Associative Array. ///</summary> ///<param name="dict">Source Dictionary collection [string|string].</param> ///<returns>JSON Associative Array string.</returns> public static string ConvertToJSONAssociativeArray(Dictionary<string, string> dict) { var elements = new List<string>(); foreach (var pair in dict) { if(!string.IsNullOrEmpty(pair.Value)) { elements.Add(string.Format(""{0}":{2}{1}{2}", EscapeJSONString(pair.Key), EscapeJSONString(pair.Value), IsJSONArray(pair.Value) || IsBoolean(pair.Value) ? string.Empty : """)); } } return "{" + string.Join(",", elements.ToArray()) + "}"; } /// <summary> /// Determines if input string is a formatted JSON Array. /// </summary> /// <param name="test">string</param> /// <returns>bool</returns> public static bool IsJSONArray(string test) { return test.StartsWith("{") && !test.StartsWith("{*") || test.StartsWith("["); } /// <summary> /// Determines if input string is a boolean value. /// </summary> /// <param name="test">string</param> /// <returns>bool</returns> public static bool IsBoolean(string test) { return test.Equals("false") || test.Equals("true"); } /// <summary> /// Converts a List collection of type string to a JSON Array. /// </summary> /// <param name="list">List of strings</param> /// <returns>string</returns> public static string ConvertToJSONArray(List<string> list) { if (list == null || list.Count == 0) { return "[]"; } StringBuilder builder = new StringBuilder(); builder.Append("["); foreach (var item in list) { builder.Append(string.Format("{0}{1}{0},", IsJSONArray(item) || IsBoolean(item) ? string.Empty : """, EscapeJSONString(item))); } builder.Replace(",", "]", builder.Length - 1, 1); return builder.ToString(); } /// <summary> /// Converts a List collection of type long to a JSON Array. /// </summary> /// <param name="list">List of longs</param> /// <returns>string</returns> public static string ConvertToJSONArray(List<long> list) { if (list == null || list.Count == 0) { return "[]"; } StringBuilder builder = new StringBuilder(); builder.Append("["); foreach (var item in list) { builder.Append(string.Format("{0}{1}{0},", IsJSONArray(item.ToString()) || IsBoolean(item.ToString()) ? string.Empty : """, EscapeJSONString(item.ToString()))); } builder.Replace(",", "]", builder.Length - 1, 1); return builder.ToString(); } /// <summary> /// Converts a JSON Array string to a List collection of type string. /// </summary> /// <param name="array">JSON Array string</param> /// <returns>List of strings</returns> public static List<string> ConvertFromJSONArray(string array) { if (!string.IsNullOrEmpty(array)) { array = array.Replace("[", "").Replace("]", "").Replace(""", ""); return new List<string>(array.Split(',')); } return new List<string>(); } /// <summary> /// Converts a JSON Array string to a Dictionary collection of type string, string. /// </summary> /// <param name="array">JSON Array string</param> /// <returns>Dictionary of string, string</returns> public static Dictionary<string, string> ConvertFromJSONAssoicativeArray(string array) { var dict = new Dictionary<string, string>(); if (!string.IsNullOrEmpty(array)) { array = array.Replace("{", "").Replace("}", "").Replace("":", "|").Replace(""", "").Replace("/", "/"); var pairs = new List<string>(array.Split(',')); foreach (var pair in pairs) { if (!string.IsNullOrEmpty(pair)) { var pairArray = pair.Split('|'); dict.Add(pairArray[0], pairArray[1]); } } return dict; } return new Dictionary<string, string>(); } /// <summary> /// Escape backslashes and double quotes of valid JSON content string. /// </summary> /// <param name="originalString">string</param> /// <returns>string</returns> public static string EscapeJSONString(string originalString) { return IsJSONArray(originalString) ? originalString : originalString.Replace("/", "/").Replace("/", "/").Replace(""", """).Replace(""", """).Replace(" ", " ").Replace(" ", " "); } } }