C# Dictionary字典

//1.声明及赋值  
Dictionary<string, ulong> keyValues = new Dictionary<string, ulong>();
            keyValues.Add("A", 3);
            keyValues.Add("B", 13);
            keyValues.Add("C", 23);
            keyValues.Add("D", 33);
//2.将字典转化为字符串
string currentUsageJson = JsonConvert.SerializeObject(keyValues, Newtonsoft.Json.Formatting.Indented);