你说得对,KeyValuePairConverter
在这里似乎无法正常工作。在不深入 Json.Net 源代码的情况下,我只能推测原因。作为解决方法,您可以进行自己的自定义JsonConverter
很容易地完成这个翻译:
class MyDictionaryConverter<T> : JsonConverter
{
public override bool CanConvert(Type objectType)
{
return (objectType == typeof(Dictionary<string, T>));
}
public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
{
JArray array = JArray.Load(reader);
Dictionary<string, T> dict = new Dictionary<string, T>();
foreach (JObject obj in array.Children<JObject>())
{
string key = obj["Key"].ToString();
T val = obj["Value"].ToObject<T>();
dict.Add(key, val);
}
return dict;
}
public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
{
Dictionary<string, T> dict = (Dictionary<string, T>)value;
JArray array = new JArray();
foreach (KeyValuePair<string, T> kvp in dict)
{
JObject obj = new JObject();
obj.Add("Key", kvp.Key);
obj.Add("Value", JToken.FromObject(kvp.Value));
array.Add(obj);
}
array.WriteTo(writer);
}
}
使用以下命令将转换器应用到字典中[JsonConverter]
属性:
public class MyClass
{
[JsonConverter(typeof(MyDictionaryConverter<int>))]
public Dictionary<string, int> MyDict { get; set; }
}
这是一个简短的演示程序,显示转换器的运行情况(完整往返):
class Program
{
static void Main(string[] args)
{
MyClass mc = new MyClass { MyDict = new Dictionary<string, int>() };
mc.MyDict.Add("One", 1);
mc.MyDict.Add("Two", 2);
string json = JsonConvert.SerializeObject(mc, Formatting.Indented);
Console.WriteLine(json);
Console.WriteLine();
MyClass mc2 = JsonConvert.DeserializeObject<MyClass>(json);
foreach (KeyValuePair<string, int> kvp in mc2.MyDict)
{
Console.WriteLine(kvp.Key + " == " + kvp.Value);
}
}
}
上面的输出:
{
"MyDict": [
{
"Key": "One",
"Value": 1
},
{
"Key": "Two",
"Value": 2
}
]
}
One == 1
Two == 2