您可以使用为要序列化为数组的每个字典类型JsonConverterFactory
制造特定的 a 来执行此操作。JsonConverter<T>
这是一个适用于每个实现的类的转换器IDictionary<TKey, TValue>
:
public class DictionaryConverterFactory : JsonConverterFactory
{
public override bool CanConvert(Type typeToConvert)
{
return typeToConvert.IsClass && typeToConvert.GetDictionaryKeyValueType() != null && typeToConvert.GetConstructor(Type.EmptyTypes) != null;
}
public override JsonConverter CreateConverter(Type typeToConvert, JsonSerializerOptions options)
{
var keyValueTypes = typeToConvert.GetDictionaryKeyValueType();
var converterType = typeof(DictionaryAsArrayConverter<,,>).MakeGenericType(typeToConvert, keyValueTypes.Value.Key, keyValueTypes.Value.Value);
return (JsonConverter)Activator.CreateInstance(converterType);
}
}
public class DictionaryAsArrayConverter<TKey, TValue> : DictionaryAsArrayConverter<Dictionary<TKey, TValue>, TKey, TValue>
{
}
public class DictionaryAsArrayConverter<TDictionary, TKey, TValue> : JsonConverter<TDictionary> where TDictionary : class, IDictionary<TKey, TValue>, new()
{
struct KeyValueDTO
{
public TKey Key { get; set; }
public TValue Value { get; set; }
}
public override TDictionary Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
{
var list = JsonSerializer.Deserialize<List<KeyValueDTO>>(ref reader, options);
if (list == null)
return null;
var dictionary = typeToConvert == typeof(Dictionary<TKey, TValue>) ? (TDictionary)(object)new Dictionary<TKey, TValue>(list.Count) : new TDictionary();
foreach (var pair in list)
dictionary.Add(pair.Key, pair.Value);
return dictionary;
}
public override void Write(Utf8JsonWriter writer, TDictionary value, JsonSerializerOptions options)
{
JsonSerializer.Serialize(writer, value.Select(p => new KeyValueDTO { Key = p.Key, Value = p.Value }), options);
}
}
public static class TypeExtensions
{
public static IEnumerable<Type> GetInterfacesAndSelf(this Type type)
{
if (type == null)
throw new ArgumentNullException();
if (type.IsInterface)
return new[] { type }.Concat(type.GetInterfaces());
else
return type.GetInterfaces();
}
public static KeyValuePair<Type, Type>? GetDictionaryKeyValueType(this Type type)
{
KeyValuePair<Type, Type>? types = null;
foreach (var pair in type.GetDictionaryKeyValueTypes())
{
if (types == null)
types = pair;
else
return null;
}
return types;
}
public static IEnumerable<KeyValuePair<Type, Type>> GetDictionaryKeyValueTypes(this Type type)
{
foreach (Type intType in type.GetInterfacesAndSelf())
{
if (intType.IsGenericType
&& intType.GetGenericTypeDefinition() == typeof(IDictionary<,>))
{
var args = intType.GetGenericArguments();
if (args.Length == 2)
yield return new KeyValuePair<Type, Type>(args[0], args[1]);
}
}
}
}
然后将工厂添加到JsonSerializerOptions.Converters
本地如下:
var options = new JsonSerializerOptions
{
Converters = { new DictionaryConverterFactory() },
PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
};
var json = JsonSerializer.Serialize(dictionary, options);
var dictionary2 = JsonSerializer.Deserialize<TDictionary>(json, options);
或全局在 ASP.NET Core 中,如如何在 asp.net core 3 中设置 json 序列化程序设置?:
services.AddControllers().AddJsonOptions(options =>
{
options.JsonSerializerOptions.Converters.Add(new DictionaryConverterFactory());
options.PropertyNamingPolicy = JsonNamingPolicy.CamelCase;
});
DictionaryAsArrayConverter<TKey, TValue>
如果您只想将某些字典类型序列化为数组,也可以直接使用底层的单个转换器。
笔记:
演示小提琴在这里。