这不是开箱即用的。如果您检查源，JsonSerializerInternalWriter.SerializeList()您将发现没有逻辑可以基于某些过滤器跳过收集条目。

但是，Json.NET确实具有强大的异常处理功能。如果在开始序列化对象时引发了异常，则在[OnError]回调中将其捕获并吞下：

• 如果写入数组条目，则 跳过 该数组条目（您想要的行为）。
• 如果编写根对象，则不会捕获异常（可能是错误？）
• 否则null被写入。

因此，实现所需功能的一种可能性是从JsonContract.OnSerializingCallbacks自定义合同解析器添加的人工回调中引发异常，然后使用添加的处理程序捕获并吞下该异常JsonContract.OnErrorCallbacks。与已经进行的对属性值的过滤结合使用时，此方法的优点在于，即使秘密对象是根对象或包含在字典，动态对象或多维数组中，也无法对它进行序列化。这种方法不会干扰PreserveReferencesHandling.Arrays。

一个执行此操作的合同解析器如下：

sealed class JsonSkipObjectException : JsonException
{
}

public class ShouldSerializeContractResolver : DefaultContractResolver
{
    readonly Predicate<object> shouldSerialize;
    readonly SerializationCallback serializationCallback;
    readonly SerializationErrorCallback onErrorCallback;

    public ShouldSerializeContractResolver(Predicate<object> shouldSerialize)
        : base()
    {
        this.shouldSerialize = shouldSerialize;
        this.serializationCallback = (o, context) =>
            {
                if (shouldSerialize != null && !this.shouldSerialize(o))
                    throw new JsonSkipObjectException();
            };
        this.onErrorCallback = (o, context, errorContext) =>
            {
                if (errorContext.Error is JsonSkipObjectException)
                {
                    errorContext.Handled = true;
                }
            };
    }

    protected override JsonProperty CreateProperty(MemberInfo member, MemberSerialization memberSerialization)
    {
        var property = base.CreateProperty(member, memberSerialization);

        if (shouldSerialize != null)
        {
            if (property.Readable)
            {
                var oldShouldSerialize = property.ShouldSerialize;
                property.ShouldSerialize = (o) =>
                    {
                        if (oldShouldSerialize != null && !oldShouldSerialize(o))
                            return false;
                        var value = property.ValueProvider.GetValue(o);
                        if (!this.shouldSerialize(value))
                            return false;
                        return true;
                    };
            }
        }
        return property;
    }

    protected override JsonContract CreateContract(Type objectType)
    {
        var contract = base.CreateContract(objectType);
        contract.OnSerializingCallbacks.Add(serializationCallback);
        contract.OnErrorCallbacks.Add(onErrorCallback);
        return contract;
    }
}

那么一种可能的用途是：

public interface IConditionalSerialization
{
    bool ShouldSerialize();
}

public class ConditionalSerializationObject : IConditionalSerialization
{
    public bool IsSecret { get; set; }

    public string SecretProperty { get { return "should not see me"; } }

    // Ensure "normal" conditional property serialization is not broken
    public bool ShouldSerializeSecretProperty()
    {
        return false;
    }

    #region IConditionalSerialization Members

    bool IConditionalSerialization.ShouldSerialize()
    {
        return !IsSecret;
    }

    #endregion
}

public class TestClass
{
    public static void Test()
    {
        Predicate<object> filter = (o) => 
            {
                var conditional = o as IConditionalSerialization;
                return conditional == null || conditional.ShouldSerialize();
            };
        var settings = new JsonSerializerSettings
        {
            ContractResolver = new ShouldSerializeContractResolver(filter),
        };

        var ok = new ConditionalSerializationObject { IsSecret = false };
        var notOk = new ConditionalSerializationObject { IsSecret = true };

        Test(ok, settings);
        Test(new { Public = ok, Private = notOk }, settings);
        Test(new [] { ok, notOk, ok, notOk }, settings);
        Test(new[,] {{ ok, notOk, ok, notOk }}, settings);
        Test(new { Array = new[,] { { ok, notOk, ok, notOk } } }, settings);
        try
        {
            Test(notOk, settings);
        }
        catch (Exception ex)
        {
            Console.WriteLine("Exception thrown and not caught serializing root object " + notOk.GetType());
            Console.WriteLine(ex);
        }
    }

    static void Test<T>(T value, JsonSerializerSettings settings)
    {
        Console.WriteLine("Unfiltered object: ");
        Console.WriteLine(JToken.FromObject(value));

        var serializer = JsonSerializer.CreateDefault(settings);
        var token = JToken.FromObject(value, serializer);
        Console.WriteLine("Filtered object: ");
        Console.WriteLine(token);
        if (!token.SelectTokens("..IsSecret").All(t => JToken.DeepEquals(t, (JValue)false)))
        {
            throw new InvalidOperationException("token.SelectTokens(\"..IsSecret\").All(t => JToken.DeepEquals(t, (JValue)true))");
        }
        if (token.SelectTokens("..SecretProperty").Any())
        {
            throw new InvalidOperationException("token.SelectTokens(\"..SecretProperty\").Any()");
        }
        Console.WriteLine("Secret objects and properties were successfully filtered.");
        Console.WriteLine("");
    }
}

原型小提琴。

请注意，引发和捕获大量异常可能会对性能产生影响。您将需要分析您的Web应用程序，以确定是否存在问题。您还需要确定您的Web服务在尝试序列化“秘密”根对象时是应返回异常还是执行其他操作。