Question

我正在使用Newtonsoft.Json序列化缓存值，我想知道是否有一种方法可以排除可执行属性，方法与从序列化中排除方法相同？最好是一种全局设置的方法，所以我不需要用属性标记数百个属性（我首先必须在数千个属性中找到）。

代码：

[Serializable]
public class Item
{
    public long Id { get; set; }

    public string Name { get; set; }

    public List<Image> Images { get; set; }

    public Image PrimaryImage { get { return Images[0]; } }
}

[Serializable]
public class Image
{
    public long Id { get; set; }

    public string FileName { get; set; }
}

错误：

Error getting value from 'PrimaryImage' on 'Item'.
at Newtonsoft.Json.Serialization.DynamicValueProvider.GetValue(Object target)
at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.CalculatePropertyValues(JsonWriter writer, Object value, JsonContainerContract contract, JsonProperty member, JsonProperty property, JsonContract& memberContract, Object& memberValue)
at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeObject(JsonWriter writer, Object value, JsonObjectContract contract, JsonProperty member, JsonContainerContract collectionContract, JsonProperty containerProperty)
at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeList(JsonWriter writer, IEnumerable values, JsonArrayContract contract, JsonProperty member, JsonContainerContract collectionContract, JsonProperty containerProperty)
at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.Serialize(JsonWriter jsonWriter, Object value, Type objectType)
at Newtonsoft.Json.JsonSerializer.SerializeInternal(JsonWriter jsonWriter, Object value, Type objectType)
at Newtonsoft.Json.JsonConvert.SerializeObjectInternal(Object value, Type type, JsonSerializer jsonSerializer)

我还要提到PrimaryImage中的逻辑已经简化，因此解决方案是不要跳过使用该属性。这似乎是一个非常常见的属性使用，所以我觉得很奇怪，它已经没有处理它了。

Answer 1

尝试此代码（仅序列化get-set属性）：

public static class NewtonsoftDefaultSettings
{
    public static JsonSerializerSettings CreateRelease()
    {
        return Create(Formatting.None);
    }

    public static JsonSerializerSettings CreateDebug()
    {
        return Create(Formatting.Indented);
    }

    private static JsonSerializerSettings Create(Formatting formatting)
    {
        return new JsonSerializerSettings
        {
            Formatting = formatting,
            ReferenceLoopHandling = ReferenceLoopHandling.Ignore,
            ContractResolver = new MyContractResolver()
        };
    }
}

internal class MyContractResolver : DefaultContractResolver
{
    protected override List<MemberInfo> GetSerializableMembers(Type objectType)
    {
        var members = base.GetSerializableMembers(objectType).Cast<PropertyInfo>().ToList();
        members.RemoveAll(x => !x.CanRead || !x.CanWrite);
        return members.Cast<MemberInfo>().ToList();
    }
}

最后：

var str = JsonConvert.SerializeObject(value, NewtonsoftDefaultSettings.CreateDebug());

从JSON序列化中排除可执行属性

1 个答案: