c# - 如何使用 Newtonsoft Json.Net 反序列化接口

Question

我有这个类层次结构：

public class ProxyBotsSnapshotLogEntryDetails : IBotsSnapshotLogEntryDetails
{
    public ICollection<IBotSnapshot> Snapshots { get; set; }
}
public class ProxyBotSnapshot : IBotSnapshot
{
    public string Name { get; set; }
    public ICollection<IBotSnapshotItem> States { get; set; }
}

public class ProxyBotSnapshotItem : IBotSnapshotItem
{
    public int Count { get; set; }
    public IrcBotChannelStateEnum State { get; set; }
}

及其对应的接口

public interface IBotsSnapshotLogEntryDetails
{
    ICollection<IBotSnapshot> Snapshots { get; set; }
}

public interface IBotSnapshot
{
    string Name { get; set; }
    ICollection<IBotSnapshotItem> States { get; set; }
}

public interface IBotSnapshotItem
{
    int Count { get; set; }
    IrcBotChannelStateEnum State { get; set; }
}

我想从 JSON 反序列化：

var test = JsonConvert.DeserializeObject<ProxyBotsSnapshotLogEntryDetails>(entry.DetailsSerialized);

但我收到一条错误消息，说 Newtonsoft 无法转换接口。

我发现了这篇很有前途的文章：

https://www.c-sharpcorner.com/UploadFile/20c06b/deserializing-interface-properties-with-json-net/

但我不确定如何使用该属性，因为在我的情况下，该属性是一个接口列表。

标签： c#.netjsonserializationjson.net

Answer 1

知道了！

文章中提供的转换器工作得非常好，我只是错过了在集合属性上使用它的语法。这是带有转换器和工作属性的代码：

// From the article
public class ConcreteConverter<T> : JsonConverter
{
    public override bool CanConvert(Type objectType) => true;

    public override object ReadJson(JsonReader reader,
     Type objectType, object existingValue, JsonSerializer serializer)
    {
        return serializer.Deserialize<T>(reader);
    }

    public override void WriteJson(JsonWriter writer,
        object value, JsonSerializer serializer)
    {
        serializer.Serialize(writer, value);
    }
}

public class ProxyBotsSnapshotLogEntryDetails : IBotsSnapshotLogEntryDetails
{
    [JsonProperty(ItemConverterType = typeof(ConcreteConverter<ProxyBotSnapshot>))]
    public ICollection<IBotSnapshot> Snapshots { get; set; }
}
public class ProxyBotSnapshot : IBotSnapshot
{
    public string Name { get; set; }

    [JsonProperty(ItemConverterType = typeof(ConcreteConverter<ProxyBotSnapshotItem>))]
    public ICollection<IBotSnapshotItem> States { get; set; }
}

public class ProxyBotSnapshotItem : IBotSnapshotItem
{
    public int Count { get; set; }
    public IrcBotChannelStateEnum State { get; set; }
}