JSON.Net无法在自定义JsonConverter中反序列化json数组

时间:2017-12-23 17:07:28

标签: c# arrays json serialization json.net

我遇到了一个我似乎无法解决的令人困惑的问题。

我使用Json.Net并且我已经编写了一个自定义Json转换器来处理我的应用程序中的特殊情况。 我遇到的问题是反序列化或Unexpected token while deserializing object: PropertyName. Path 'RootPages', line 1, position 13.方法,当它厌倦将JSON数组转换为字符串数组时会抛出错误:

enter image description here

错误的确切文字是:{ "RootPages": [ "TestItem1", "TestItem2" ], "Name": "root" }

从检查器中可以看出,它正在尝试反序列化(RootPages)的JProperty已经被正确解析并且是有效的JSON。 enter image description here

所以我不完全确定这里发生了什么,任何启蒙都会受到高度赞赏..

如果相关,原始JSON字符串如下:

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer) {
        if (PartialChildPageSerialization) {
            var jsonObject = JObject.Load(reader);
            var properties = jsonObject.Properties().ToList();

            foreach (var property in objectType.GetProperties()) {
                var type = property.PropertyType;
                object value = null;

                if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(ChildPageCollection<>)) {
                    var collection = Activator.CreateInstance(type);
                    var deserializedValue = properties.First(p => p.Name == property.Name).ToObject<string[]>();
                    type.GetMethod("PolulateFromSerializer").Invoke(collection, new object[] {deserializedValue});
                    value = collection;
                }
                else {
                    value = properties.First(p => p.Name == property.Name).ToObject(type);
                }

                property.SetValue(existingValue, value);
            }

            return existingValue;
        }

        return serializer.Deserialize(reader, objectType);
    }

EDIT-CODE:

ReadJson方法:

public class ChildPageCollection<T> : IList<T> where T : DataPage
{
    public string[] GetNames() => _internalNameList.ToArray();

    internal void PolulateFromSerializer(string[] names) {
        this.Clear();
        _internalNameList.AddRange(names);
        _hasFullList = false;
    }

    private void CheckFullList() {
        if(!_hasFullList)
            throw new InvalidOperationException("Collection has not been fully loaded, and full list is not avialable.");
    }

    private readonly List<T> _internalList = new List<T>();
    private readonly List<string> _internalNameList = new List<string>();
    private bool _hasFullList = true;

    ...
}

ChildPageCollection有趣部分的片段:

select 
    case 
        ((select count(*) from boughtleads bl where bl.customerid = cu.id)>0)
            then 'TRUE' 
            else 'FALSE' 
    end 

from customers cu
left join leadagents la on la.customerid = cu.id
where cu.vatnumber = '30218124'

1 个答案:

答案 0 :(得分:3)

我希望这是因为第一个属性是一个具有名为&#39; RootPages&#39;这是一个字符串[]。

不幸的是,从截图的外观来看,您正试图将对象转换为字符串数组。

这应该在你给出的例子中起作用:

properties.First(p => p.Name == property.Name).Select(o => o.Children().Values<string>()).First().ToArray();

取代:

properties.First(p => p.Name == property.Name).ToObject<string[]>();