为DocumentDb设置自定义json转换器 [英] Setting a custom json converter for DocumentDb

问题描述

我正在使用类型化的DocumentQuery从Azure DocumentDb的集合中读取文档.

I am using a typed DocumentQuery to read documents from a collection of an Azure DocumentDb.

from f in client.CreateDocumentQuery<MyModel>(Collection.SelfLink) select f

因为我没有找到设置neccesarry自定义json转换器的方法，所以抛出了这个例子:

Because I do not find a way how I can set the neccesarry custom json converter, it throws this exeption:

无法创建类型AbstractObject的实例.类型是 接口或抽象类，无法实例化.

Could not create an instance of type AbstractObject. Type is an interface or abstract class and cannot be instantiated.

通常，您可以执行以下操作使其正常工作:

Usually you do something like this to make it work:

var settings = new JsonSerializerSettings();
settings.Converters.Add(new MyAbstractConverter());
client.SerializerSettings = settings;

DocumentClient没有任何SerializerSettings.所以问题是，在将json数据反序列化到我的模型时，如何告诉DocumentDB客户端必须使用自定义转换器?

DocumentClient doesn't have any SerializerSettings. So the question is, how can I tell the DocumentDB client that it must use a custom converter when deserializing the json data to my model?

推荐答案

您可以将[JsonConverter(typeof(MyAbstractConverter))]添加到模型类中.

You can add [JsonConverter(typeof(MyAbstractConverter))] to your model class.

这是带有自定义Json设置的示例模型类:

Here's an example model class with custom Json settings:

namespace DocumentDB.Samples.Twitter
{
    using System;
    using System.Collections.Generic;
    using System.Linq;
    using DocumentDB.Samples.Shared.Util;
    using Newtonsoft;
    using Newtonsoft.Json;

    /// <summary>
    /// Represents a user.
    /// </summary>
    public class User
    {
        [JsonProperty("id")]
        public long UserId { get; set; }

        [JsonProperty("name")]
        public string Name { get; set; }

        [JsonProperty("screen_name")]
        public string ScreenName { get; set; }

        [JsonProperty("created_at")]
        [JsonConverter(typeof(UnixDateTimeConverter))]
        public DateTime CreatedAt { get; set; }

        [JsonProperty("followers_count")]
        public int FollowersCount { get; set; }

        [JsonProperty("friends_count")]
        public int FriendsCount { get; set; }

        [JsonProperty("favourites_count")]
        public int FavouritesCount { get; set; }
    }
}

这篇关于为DocumentDb设置自定义json转换器的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！