c# - 从 Redis 获取复杂对象时，值为 null

Question

我正在尝试将一个复杂的对象添加到 Redis 中，但是在从 Redis 检索值时，我将某些值设为 null。下面是我正在尝试的粗略样本。我有一个复杂对象，我使用 JsonConvert 序列化该复杂对象并将其添加到 Redis 中。属性 CollectionID 有两个具有各自值的计数，但是在从 Redis 和反序列化获取它之后，该值会变为空值。请检查下图

属性 CollectionID 有两个带 ID 的值:



从 Redis 缓存中获取时，该属性变为 null


下面是示例:

class Program
{
    private static IDatabase _cache;
    private static ConnectionMultiplexer _connection;

    static void Main(string[] args)
    {
        _connection = ConnectionMultiplexer.Connect("localhost");
        _cache = _connection.GetDatabase();

        List<Id> id = new List<Id>() { new Id() { ID = 10 }, new Id() { ID = 20 } };
        Collection<Customers> collection = new Collection<Customers>() { new Customers(id) };
        Product product = new Product(new Guid(), collection, 1);
        _cache.StringSet("Redis_Key", GetSerializedString(product));
        var value = JsonConvert.DeserializeObject<Product>(_cache.StringGet("Redis_Key"));
    }

    private static String GetSerializedString<Test1>(Test1 value)
    {
        return JsonConvert.SerializeObject(
                    value,
                    Formatting.Indented,
                    new JsonSerializerSettings
                    {
                        ReferenceLoopHandling = ReferenceLoopHandling.Serialize,
                        PreserveReferencesHandling = PreserveReferencesHandling.All
                    });
    }
}

public class Product
{
    public Product(
        Guid parentGuid,
        Collection<Customers> collection,
        int number)
    {
        _parentGuid = parentGuid;
        _collection = collection;
        _number = number;
    }

    private Guid _parentGuid;
    public Guid ParentGuid
    {
        get { return _parentGuid; }
    }

    private Collection<Customers> _collection;
    public Collection<Customers> Collection
    {
        get { return _collection; }
    }

    private int _number;
    public int number
    {
        get { return _number; }
    }
}

public class Customers
{
    public Customers(IEnumerable<Id> id)
    {
        _id = id;
    }

    private IEnumerable<Id> _id;

    public IEnumerable<Id> CollectionID
    {
        get { return _id; }
    }
}

public class Id
{
    public int ID { get; set; }
}

任何建议都会有很大帮助。

谢谢，
阿尼什

Answer 1

问题是您在 CollectionID 上没有 setter .

public IEnumerable<Id> CollectionID
{
    get { return _id; }
    set { _id = value; } //need a setter
}

如果您需要 setter 为 private ，你可以这样做，但你需要一个 ContractResolver .您可以添加包 JsonNet.PrivateSettersContractResolvers ， 然后加

using JsonNet.PrivateSettersContractResolvers;
...
var value = JsonConvert.DeserializeObject<Product>(_cache.StringGet("Redis_Key"),
        new JsonSerializerSettings
        {
            ContractResolver = new PrivateSetterContractResolver()
        });

见 Private setters in Json.Net .