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c# - 使用带有 IDictionary> 的自定义解析器的反序列化问题

转载 作者:太空狗 更新时间:2023-10-30 01:33:50 25 4
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问题:

我有一个类Foo包含 IDictionary<MyCustomClass, List<string>> .我正在使用自定义 ContractResolver如图this answer这样我的字典将序列化为包含“Key”和“Value”属性的对象数组。那部分工作正常。但是,当我尝试将 JSON 反序列化回 Foo 时使用相同的解析器,我收到如下所示的错误。

错误:

Run-time exception (line 46): Cannot deserialize the current JSON array (e.g. [1,2,3]) into type 'System.Collections.Generic.IDictionary2[mycustomclass,System.Collections.Generic.List1[System.String]]' because the type requires a JSON object (e.g. {"name":"value"}) to deserialize correctly.

To fix this error either change the JSON to a JSON object (e.g. {"name":"value"}) or change the deserialized type to an array or a type that implements a collection interface (e.g. ICollection, IList) like List that can be deserialized from a JSON array. JsonArrayAttribute can also be added to the type to force it to deserialize from a JSON array.

Path 'Dict2', line 12, position 13.

Dotnetfiddle:

https://dotnetfiddle.net/BKaKab

我的代码:

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using Newtonsoft.Json;
using Newtonsoft.Json.Serialization;



public class mycustomclass
{
public string name {get;set;}
public List<string> Productlist {get;set;}
public List<string> SelectedItems{get;set;}
}


public class Program
{
public static void Main()
{
mycustomclass omycustomclass = new mycustomclass{name = "Test",Productlist = new string[]{"Product1","Product2","Product3"}.ToList(), SelectedItems = new string[]{"Item1","Item2","Item3"}.ToList()};
mycustomclass omycustomclass2 = new mycustomclass{name = "Test",Productlist = new string[]{"Product4","Product5","Product6"}.ToList(), SelectedItems = new string[]{"Item4","Item5","Item6"}.ToList()};

Foo foo = new Foo();
foo.Dict = new Dictionary<string, string>();
foo.Dict.Add("Gee", "Whiz");
foo.Dict.Add("Fizz", "Bang");

Dictionary<mycustomclass, List<string>> custom = new Dictionary<mycustomclass, List<string>>();
custom.Add(omycustomclass, new string[]{"l1","l2","l3"}.ToList());
custom.Add(omycustomclass2, new string[]{"l4","l5","l6"}.ToList());
foo.Dict2 = custom;


JsonSerializerSettings settings = new JsonSerializerSettings();
settings.Formatting = Formatting.Indented;
settings.ContractResolver = new DictionaryAsArrayResolver();

// serialize
string json = JsonConvert.SerializeObject(foo, settings);
Console.WriteLine(json);
Console.WriteLine();

// deserialize
foo = JsonConvert.DeserializeObject<Foo>(json, settings);
foreach (var kvp in foo.Dict)
{
Console.WriteLine(kvp.Key + ": " + kvp.Value);
}

}

class Foo
{
public Dictionary<string, string> Dict { get; set; }
public IDictionary<mycustomclass, List<string>> Dict2 { get; set; }
}
}

class DictionaryAsArrayResolver : DefaultContractResolver
{
protected override JsonContract CreateContract(Type objectType)
{
if (objectType.GetInterfaces().Any(i => i == typeof(IDictionary) ||
(i.IsGenericType && i.GetGenericTypeDefinition() == typeof(IDictionary<,>))))
{
return base.CreateArrayContract(objectType);
}

return base.CreateContract(objectType);
}
}

JSON:

{
"Dict": [
{
"Key": "Gee",
"Value": "Whiz"
},
{
"Key": "Fizz",
"Value": "Bang"
}
],
"Dict2": [
{
"Key": {
"name": "Test",
"Productlist": [
"Product1",
"Product2",
"Product3"
],
"SelectedItems": [
"Item1",
"Item2",
"Item3"
]
},
"Value": [
"l1",
"l2",
"l3"
]
},
{
"Key": {
"name": "Test",
"Productlist": [
"Product1",
"Product2",
"Product3"
],
"SelectedItems": [
"Item1",
"Item2",
"Item3"
]
},
"Value": [
"l1",
"l2",
"l3"
]
}
]
}

有人可以帮我让它工作吗?

最佳答案

不确定这是否是最好的方法,但它可以解决您的问题。创建转换器

internal class MyConverter : CustomCreationConverter<IDictionary<CustomClass, List<String>>>
{
public override IDictionary<CustomClass, List<String>> Create(Type objectType)
{
return new Dictionary<CustomClass, List<String>>();
}

public override bool CanConvert(Type objectType)
{
return objectType == typeof (object) || base.CanConvert(objectType);
}
}

将其添加到您的设置中:

var settings = new JsonSerializerSettings
{
Formatting = Formatting.Indented,
ContractResolver = new DictionaryAsArrayResolver(),
Converters = new JsonConverter[] {new MyConverter()}
};

享受吧。

Sample

关于c# - 使用带有 IDictionary<Mycustomclass, List<string>> 的自定义解析器的反序列化问题,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/32473308/

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