Question

我看到使用JSON.Net，如果$type属性指定JSON对象的特定类型，我可以解码多态对象。在我看到的所有示例中，$type包含命名空间。是否可以使这项工作包括一个简单的类型名称而不需要汇编？如果可能的话，我很乐意为JsonSerializer指定默认程序集。

我可以使用以下命令反序列化JSON：

public class SingleAssemblyJsonTypeBinder : SerializationBinder
{
    private readonly Assembly _assembly;
    private Dictionary<string, Type> _typesBySimpleName = new Dictionary<string, Type>(StringComparer.OrdinalIgnoreCase); 
    private Dictionary<Type,string> _simpleNameByType = new Dictionary<Type, string>(); 

    public SingleAssemblyJsonTypeBinder(Assembly assembly)
    {
        _assembly = assembly;
        _typesBySimpleName = new Dictionary<string, Type>();

        foreach (var type in _assembly.GetTypes().Where(t => t.IsPublic))
        {
            if (_typesBySimpleName.ContainsKey(type.Name))
                throw new InvalidOperationException("Cannot user PolymorphicBinder on a namespace where multiple public types have same name.");

            _typesBySimpleName[type.Name] = type;
            _simpleNameByType[type] = type.Name;
        }
    }

    public override Type BindToType(string assemblyName, string typeName)
    {
        Type result;
        if (_typesBySimpleName.TryGetValue(typeName.Trim(), out result))
            return result;

        return null;
    }

    public override void BindToName(Type serializedType, out string assemblyName, out string typeName)
    {
        string name;

        if (_simpleNameByType.TryGetValue(serializedType, out name))
        {
            typeName = name;
            assemblyName = null;// _assembly.FullName;
        }
        else
        {
            typeName = null;
            assemblyName = null;
        }
    }
}

...

public static JsonSerializerSettings GetJsonSerializationSettings()
{
    var settings = new JsonSerializerSettings();
    settings.Binder = new SingleAssemblyJsonTypeBinder(typeof(MvcApplication).Assembly);
    settings.TypeNameHandling = TypeNameHandling.Objects;
    return settings;
}

...

var serializer = JsonSerializer.Create(settings);

虽然我无法使用MVC。我正按照Application_Start中的下面的代码配置JSON反序列化，并且对象被反序列化，但使用基类型。

GlobalConfiguration.Configuration.Formatters.JsonFormatter.SerializerSettings.Binder = new SingleAssemblyJsonTypeBinder(this.GetType().Assembly);
GlobalConfiguration.Configuration.Formatters.JsonFormatter.SerializerSettings.TypeNameHandling = TypeNameHandling.All;
GlobalConfiguration.Configuration.Formatters.JsonFormatter.SerializerSettings.TypeNameAssemblyFormat = FormatterAssemblyStyle.Simple;

Answer 1

创建派生SerializationBinder，其中覆盖BindToName并将out string assemblyName设置为null（修改：或您的默认程序集名称）和out string typeName到你的条纹类型名称

在序列化之前将活页夹设置为JsonSerializerSettings.Binder。

如果这不起作用，请告诉我

JSON.Net：在不指定程序集的情况下反序列化多态类型

1 个答案: