.net 4.5 控制器：参数多态和自定义 Json 反序列化

Question

我有一个 API，其中有一个同步控制器。这个控制器只有一个动作函数：ActionRequest

public IHttpActionResult ActionRequest([FromBody]ActionRequestDto model)
{
    //EXAMPLE OF PASSING AND ARTICLE IN OBJECT THREW POST METHOD
    ArticleDto article = null;
    if(model.ActionType == "Article"){
        article = (ArticleDto)model.Object; //Problem ==> model.Object looses all articles information and cannot be cast to article
    }
}

此功能应该像路由器一样工作。它读取操作请求并调用适当的存储库。

ActionRequest 对象具有以下结构：

public class ActionRequestDto
{
    public string ActionType { get; set; }
    public string ObjectType { get; set; }
    public bool Transmited { get; set; } = false;
    public DateTime CreationDate { get; set; }
    public int RequestNumber { get; set; }
    public string Reference { get; set; }
    public BaseDto Object { get; set; }// this is where the data is passed.
                   //it can be any type extending from BaseDto (ArticleDto, CustomerDto... )
}

我需要获取最终对象，而不仅仅是控制器中的基础对象，这样我才能将它传递给服务。

如何更改反序列化行为但仅针对此操作或至少针对此控制器？

Answer 1

大家早上好。

我被这个问题启发了：

这就是我所做的。

创建自定义 Json 转换器 class

public class BaseDtoJsonConvertor : JsonConverter
{

public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
{
    var actionRequestDto = (ActionRequestDto)value;

    writer.WriteStartObject();
    writer.WritePropertyName("ActionRequestDto");
    serializer.Serialize(writer, actionRequestDto.ToString());
    writer.WriteEndObject();
}

public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
{
    // Variables to be set along with sensing variables
    ActionRequestDto actionRequestDto = new ActionRequestDto();
    // Read the properties
    while (reader.Read())
    {
        if (reader.TokenType != JsonToken.PropertyName)
        {
            break;
        }
        var propertyName = (string)reader.Value;
        if (!reader.Read())
        {
            continue;
        }
        // Set the group
        if (propertyName.Equals("object", StringComparison.OrdinalIgnoreCase))
        {
            actionRequestDto.Object = JsonSerializerBaseObjectFactory.DeserializeObject(actionRequestDto.ObjectType, reader, serializer);
        }
        if (propertyName.Equals("ActionType", StringComparison.OrdinalIgnoreCase))
        {
            actionRequestDto.ActionType = serializer.Deserialize<string>(reader);
        }
        if (propertyName.Equals("ObjectType", StringComparison.OrdinalIgnoreCase))
        {
            actionRequestDto.ObjectType = serializer.Deserialize<string>(reader);
        }
        if (propertyName.Equals("Transmited", StringComparison.OrdinalIgnoreCase))
        {
            actionRequestDto.Transmited = serializer.Deserialize<bool>(reader);
        }
        if (propertyName.Equals("CreationDate", StringComparison.OrdinalIgnoreCase))
        {
            actionRequestDto.CreationDate = serializer.Deserialize<DateTime>(reader);
        }
        if (propertyName.Equals("RequestNumber", StringComparison.OrdinalIgnoreCase))
        {
            actionRequestDto.RequestNumber = serializer.Deserialize<int>(reader);
        }
        if (propertyName.Equals("Reference", StringComparison.OrdinalIgnoreCase))
        {
            actionRequestDto.Reference = serializer.Deserialize<string>(reader);
        }
    }
    return actionRequestDto;
}

public override bool CanConvert(Type objectType)
{
    return objectType == typeof(ActionRequestDto);
}
}

创建一个工厂Class到return需要的对象类型

class JsonSerializerBaseObjectFactory
{


public enum Types
{
    Article,
    Basket,
    Customer,
    WishList,
    User,
    Tarif,
    Store,
    Stock,
    ShippingTaxe,
    Seller,
    SalesDocument,
    Promotion,
    Payment,
    InventoryTransaction,
    Inventory,
    Family,
    Etablissement,
    Dimension,
    Depot,
    CreditCard,
    Country,
    Commande,
    Category,
    Cashier,
    AvailableQuantity,
    ArticleRequest
};
public static BaseDto DeserializeObject(string type, JsonReader reader, JsonSerializer serializer)
{
    Types typeRes;
    if (Enum.TryParse(type, out typeRes))
    {
        switch (typeRes)
        {
            case Types.Article:
                return serializer.Deserialize<ArticleDto>(reader);
            case Types.Basket:
                return serializer.Deserialize<BasketDto>(reader);
            case Types.Customer:
                return serializer.Deserialize<CustomerDto>(reader);
            default:
                return serializer.Deserialize<BaseDto>(reader);

        }
    }
    return serializer.Deserialize<BaseDto>(reader);
}

}

终于在 StartUp 中 Class Deglare the Custom JsonConvertor

    var config = GlobalConfiguration.Configuration;
    var jsonSettings = config.Formatters.JsonFormatter.SerializerSettings;
    jsonSettings.Converters.Add(new BaseDtoJsonConvertor());

仅此而已。每当我收到 Actionrequest 对象类型时，它都会反序列化并抛出我的自定义 jsonConvertor。

.net 4.5 控制器：参数多态和自定义 Json 反序列化

.net 4.5 Controller : Parameters polymorphism and custom Json Deserialization

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