希望您能帮助我了解Json.NET中的TypeNameHandling
和TypeNameAssemblyFormatHandling
设置如何工作。
假设具有以下实体:
namespace SerDesTest
{
public abstract class BaseClass
{
public int Int0 { get; set; }
public string String0 { get; set; }
}
public class Father : BaseClass
{
public Father() { Children = new List<BaseClass>(); }
public List<BaseClass> Children { get; set; }
}
public class Child : BaseClass
{
public Child(Father father) { Father = father; }
public Father Father { get; set; }
public int Int1 { get; set; }
public string String1 { get; set; }
}
public class Generic<T>
{
public int GenericInt { get; set; }
public string GenericString { get; set; }
public T GenericProperty { get; set; }
}
}
并使用以下辅助方法:
public static class JsonHelper
{
public static string Serialize(object obj)
{
return JsonConvert.SerializeObject(obj, Formatting.Indented, new JsonSerializerSettings
{
TypeNameHandling = TypeNameHandling.Objects,
TypeNameAssemblyFormatHandling = TypeNameAssemblyFormatHandling.Full,
ReferenceLoopHandling = ReferenceLoopHandling.Ignore,
SerializationBinder = new JsonManagerKnownTypesBinder()
{
KnownTypes = GetTypeList("SerDesTest")
}
});
}
public static TEntity Deserialize<TEntity>(string json)
{
return JsonConvert.DeserializeObject<TEntity>(json, new JsonSerializerSettings
{
TypeNameHandling = TypeNameHandling.Objects,
TypeNameAssemblyFormatHandling = TypeNameAssemblyFormatHandling.Full,
ReferenceLoopHandling = ReferenceLoopHandling.Ignore,
SerializationBinder = new JsonManagerKnownTypesBinder()
{
KnownTypes = GetTypeList("SerDesTest")
}
});
}
public static IList<Type> GetTypeList(string assemblyName)
{
List<Type> list = new List<Type>();
Assembly assembly = Assembly.LoadFrom(Path.Combine(Path.GetDirectoryName(Assembly.GetEntryAssembly().Location), $"{assemblyName}.dll"));
if (assembly != null)
{
list.AddRange(assembly.GetTypes());
}
return list.AsParallel().Distinct().ToList<Type>();
}
}
要运行以下命令:
internal static class Program
{
private static void Main(string[] args)
{
try
{
Father father = new Father();
Generic<Child> generic = new Generic<Child>
{
GenericInt = 100,
GenericString = "100",
GenericProperty = new Child(father)
{
Int0 = 0,
Int1 = 1,
String0 = "0",
String1 = "1"
}
};
string genericJson = JsonHelper.Serialize(generic);
Console.WriteLine(genericJson);
Generic<Child> genericDes = JsonHelper.Deserialize<Generic<Child>>(genericJson);
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
Console.ReadKey();
}
}
运行测试程序时,我获得以下json:
{
"$type": "Generic`1",
"GenericInt": 100,
"GenericString": "100",
"GenericProperty": {
"$type": "Child",
"Father": {
"$type": "Father",
"Children": [],
"Int0": 0,
"String0": null
},
"Int1": 1,
"String1": "1",
"Int0": 0,
"String0": "0"
}
}
和以下异常:
在JSON'SerDesTest.Generic
1, SerDesTest, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' is not compatible with 'SerDesTest.Generic
1 [[[SerDesTest.Child,SerDesTest, 版本= 1.0.0.0,文化=中性,公钥令牌=空]],SerDesTest, 版本= 1.0.0.0,文化=中性,PublicKeyToken =空”。路径“ $ type”, 第2行,位置22。
我有两个问题/问题:
1)由于Json.NET配置,我期望json第2行中的$type
字段具有“全限定名”,例如:“ $ type”:“ SerDesTest.Generic [SerDesTest,CHild]“ ,而不仅是” $ type“:” Generic`1“ ...
2)您是否有解决异常的想法?
谢谢你, Attilio
根据Brian Rogers的要求,遵循JsonManagerKnownTypesBinder
的代码:
public class JsonManagerKnownTypesBinder : ISerializationBinder
{
public IList<Type> KnownTypes { get; set; }
public Type BindToType(string assemblyName, string typeName)
{
return KnownTypes.SingleOrDefault(t => t.Name == typeName);
}
public void BindToName(Type serializedType, out string assemblyName, out string typeName)
{
assemblyName = null;
typeName = serializedType.Name;
}
}
更多测试。如果我未设置SerializationBinder
,则使用以下版本的JsonHelper
类:
public static class JsonHelper
{
public static string Serialize(object obj)
{
return JsonConvert.SerializeObject(obj, Formatting.Indented, new JsonSerializerSettings
{
TypeNameHandling = TypeNameHandling.All,
TypeNameAssemblyFormatHandling = TypeNameAssemblyFormatHandling.Full,
ReferenceLoopHandling = ReferenceLoopHandling.Ignore,
//SerializationBinder = new JsonManagerKnownTypesBinder()
//{
// KnownTypes = GetTypeList("SerDesTest")
//}
});
}
public static TEntity Deserialize<TEntity>(string json)
{
return JsonConvert.DeserializeObject<TEntity>(json, new JsonSerializerSettings
{
TypeNameHandling = TypeNameHandling.All,
TypeNameAssemblyFormatHandling = TypeNameAssemblyFormatHandling.Full,
ReferenceLoopHandling = ReferenceLoopHandling.Ignore,
//SerializationBinder = new JsonManagerKnownTypesBinder()
//{
// KnownTypes = GetTypeList("SerDesTest")
//}
});
}
}
我解决了所有问题:首先,我在反序列化过程中没有例外;第二,我将以下json作为输出:
{
"$type": "SerDesTest.Generic`1[[SerDesTest.Child, SerDesTest, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]], SerDesTest, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null",
"GenericInt": 100,
"GenericString": "100",
"GenericProperty": {
"$type": "SerDesTest.Child, SerDesTest, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null",
"Father": {
"$type": "SerDesTest.Father, SerDesTest, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null",
"Children": {
"$type": "System.Collections.Generic.List`1[[SerDesTest.BaseClass, SerDesTest, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]], System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e",
"$values": []
},
"Int0": 0,
"String0": null
},
"Int1": 1,
"String1": "1",
"Int0": 0,
"String0": "0"
}
}
您可以使用TypeNameAssemblyFormatHandling
选项来调整$Type
字段中包含的信息。
问题就变成了:如何实现ISerializationBinder
接口以获取更安全的软件?
答案 0 :(得分:0)
要在$ type字段中使用“全限定名”,请在更新1 中更改const TextDetailScreen = (props) => {
return (
<ScrollView>
<Text> ...longText...</Text>
</ScrollView>
);
};
,以在JsonManagerKnownTypesBinder
和{{1}中设置程序集名称。 }方法,如下所示
BindToType