Serialize hashtable using Json.Net

问题

I have a hashtable whose keys are of type integer, however when deserializing using json.net the keys come back as strings, is there a way to keep the key type on hashtable using json.net serialization/deserialization? This hashtable is a property of the type 'MyType'

var settings = new JsonSerializerSettings();
settings.TypeNameHandling = TypeNameHandling.Objects;
string json = JsonConvert.SerializeObject(o, Formatting.Indented, settings);

 mo = JsonConvert.DeserializeObject<MyType>(json, new JsonSerializerSettings { TypeNameHandling = TypeNameHandling.Objects });

public Hashtable jsonViews
{
    get { return mViews; }
    set { mViews = value; }
}

回答1:

The problem is that the System.Collections.Hashtable isn't strongly typed - it will hold any type of object, and JSON.NET is most likely serialising the string representation of your hashtable contents.

Before you spend too much time massaging the JSON.NET serializer/deserializer to compensate for this, you might want to consider switching your Hashtable out for a Dictionary<TKey, TValue>. It's almost identical in terms of performance, but gives you the advantage and safety of a strongly-typed collection.

A strongly-typed collection will resolve your Json.NET deserialization issues, as Json.NET can infer the type from the dictionary.

The use of Dictionary<TKey,TValue> over Hashtable is discussed here.

回答2:

Here's a generic static extension method that I wrote to help me with this problem. I basically wanted this code to never blow up even if the data is somehow corrupted.

    public static T Read<T>(this Hashtable hash, string key)
    {
        if (!hash.ContainsKey(key))
            return default;
        if (hash[key] is T)
            return (T)hash[key];
        if (hash[key] is JToken token)
            return token.ToObject<T>();

        try
        {
            return (T)Convert.ChangeType(hash[key], typeof(T));
        }
        catch (InvalidCastException)
        {
            Debug.LogWarning($"{key} had the wrong type of {hash[key].GetType()}");
            return default;
        }
    }

来源：https://stackoverflow.com/questions/27939880/serialize-hashtable-using-json-net

标签

json

json.net

hashtable