Ich habe ein mit DataContractJsonSerializer zum Speichern serialisiertes Wörterbuch, das ich mit Newtonsoft.Json deserialisieren möchte.

Der DataContractJsonSerializer hat das Wörterbuch in eine Liste von Schlüssel / Wert-Paaren serialisiert:

{"Dict":[{"Key":"Key1","Value":"Val1"},{"Key":"Key2","Value":"Val2"}]}

Gibt es irgendwelche coolen Optionen, die ich dem @ geben kanJsonConvert.DeserializeObject<>() Damit wird es sowohl dieses Datenformat als auch das Format von Newtonsoft.Json unterstützen?

{"Dict":{"Key1":"Val1","Key2":"Val2"}}

Ist das hübsche Format, das Newtonsoft.Json erstellt, und ich möchte in einer Übergangszeit sowohl das alte DataContract-Format als auch das neue Newtonsoft-Format lesen können.

Vereinfachtes Beispiel:

    //[JsonArray]
    public sealed class Data
    {
        public IDictionary<string, string> Dict { get; set; }
    }

    [TestMethod]
    public void TestSerializeDataContractDeserializeNewtonsoftDictionary()
    {
        var d = new Data
        {
            Dict = new Dictionary<string, string>
            {
                {"Key1", "Val1"},
                {"Key2", "Val2"},
            }
        };

        var oldJson = String.Empty;
        var formatter = new DataContractJsonSerializer(typeof (Data));
        using (var stream = new MemoryStream())
        {
            formatter.WriteObject(stream, d);
            oldJson = Encoding.UTF8.GetString(stream.ToArray());
        }

        var newJson = JsonConvert.SerializeObject(d);
        // [JsonArray] on Data class gives:
        //
        // System.InvalidCastException: Unable to cast object of type 'Data' to type 'System.Collections.IEnumerable'.

        Console.WriteLine(oldJson);
        // This is tha data I have in storage and want to deserialize with Newtonsoft.Json, an array of key/value pairs
        // {"Dict":[{"Key":"Key1","Value":"Val1"},{"Key":"Key2","Value":"Val2"}]}

        Console.WriteLine(newJson);
        // This is what Newtonsoft.Json generates and should also be supported:
        // {"Dict":{"Key1":"Val1","Key2":"Val2"}}

        var d2 = JsonConvert.DeserializeObject<Data>(newJson);
        Assert.AreEqual("Val1", d2.Dict["Key1"]);
        Assert.AreEqual("Val2", d2.Dict["Key2"]);

        var d3 = JsonConvert.DeserializeObject<Data>(oldJson);
        // Newtonsoft.Json.JsonSerializationException: Cannot deserialize the current JSON array (e.g. [1,2,3]) into 
        // type 'System.Collections.Generic.IDictionary`2[System.String,System.String]' because the type requires a JSON 
        // object (e.g. {"name":"value"}) to deserialize correctly.
        //
        // To fix this error either change the JSON to a JSON object (e.g. {"name":"value"}) or change the deserialized type
        // to an array or a type that implements a collection interface (e.g. ICollection, IList) like List<T> that can be 
        // deserialized from a JSON array. JsonArrayAttribute can also be added to the type to force it to deserialize from
        // a JSON array.
        //
        // Path 'Dict', line 1, position 9.

        Assert.AreEqual("Val1", d3.Dict["Key1"]);
        Assert.AreEqual("Val2", ,d3.Dict["Key2"]);
    }