转自：http://www.cnblogs.com/YUTOUYUWEI/p/5585863.html
在开发过程中，有时候需要将json字符串转为字典类型，反之亦然，通常采用.Net的开源类库Newtonsoft.Json进行序列化，这里我也是采用这个，不过我更喜欢写扩展方法方便在项目的调用。
首先新建一个扩展类JsonExtensions（类名自己按照自己喜好定义）：
public static class JsonExtensions{/// <summary>/// 将字典类型序列化为json字符串/// </summary>/// <typeparam name="TKey">字典key</typeparam>/// <typeparam name="TValue">字典value</typeparam>/// <param name="dict">要序列化的字典数据</param>/// <returns>json字符串</returns>public static string SerializeDictionaryToJsonString<TKey, TValue>(Dictionary<TKey, TValue> dict){if (dict.Count == 0)return "";string jsonStr = JsonConvert.SerializeObject(dict);return jsonStr;}/// <summary>/// 将json字符串反序列化为字典类型/// </summary>/// <typeparam name="TKey">字典key</typeparam>/// <typeparam name="TValue">字典value</typeparam>/// <param name="jsonStr">json字符串</param>/// <returns>字典数据</returns>public static Dictionary<TKey, TValue> DeserializeStringToDictionary<TKey, TValue>(string jsonStr){if (string.IsNullOrEmpty(jsonStr))return new Dictionary<TKey, TValue>();Dictionary<TKey, TValue> jsonDict = JsonConvert.DeserializeObject<Dictionary<TKey, TValue>>(jsonStr);return jsonDict;}}
接下来就调用这两个扩展方法，看看是否可行，这里我写的是一个单元测试，方便用于测试，写的一般，大家可以自行回去测试：
[TestClass]
public class DictionaryTest{[TestMethod]public void Can_Serialize_Deserialize(){Dictionary<string, string> paramDictionary = new Dictionary<string, string>();paramDictionary.Add("one", "productName");paramDictionary.Add("two", "productColor");paramDictionary.Add("three", DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"));paramDictionary.Add("four", DateTime.Now.AddDays(5).ToString("yyyy-MM-dd HH:mm:ss"));string jsonStr = JsonExtensions.SerializeDictionaryToJsonString<string, string>(paramDictionary);var jsonDict = JsonExtensions.DeserializeStringToDictionary<string, string>(jsonStr);List<string> dict1 = new List<string>();foreach (var item in paramDictionary){dict1.Add(paramDictionary[item.Key]);}List<string> dict2 = new List<string>();foreach (var item in jsonDict){dict2.Add(jsonDict[item.Key]);}int intersect = dict1.Intersect(dict2).Count(); // 交集int except = dict1.Except(dict2).Count(); // 差集int union = dict1.Union(dict2).Count(); // 并集Assert.AreEqual(4, intersect);Assert.AreEqual(0, except);Assert.AreEqual(4, union);Assert.AreEqual("productName", dict2[0]);Assert.AreEqual("productColor", dict2[1]);Assert.AreEqual(4, dict2.Count);}}
输出结果：
