public static void Serialize(this Utf8JsonWriter writer, object res, WritedObjects objrefs)
{
if (res == null || res == DBNull.Value)
{
writer.WriteNullValue();
return;
}
//先检查引用类型是否已序列化过
var type = res.GetType();
bool isRefObject = type.IsClass && type != typeof(string);
if (isRefObject)
{
if (objrefs.TryGetValue(res, out string refID))
{
if (!string.IsNullOrEmpty(refID))
{
writer.WriteStartObject();
writer.WritePropertyName(RefPropertyName);
writer.WriteStringValue(refID);
writer.WriteEndObject();
return;
}
throw new Exception("Json序列化存在重复引用");
}
if (res is Entity entity && !entity.Model.IsDTO)
{
refID = $"{(byte)entity.PersistentState}{entity.ModelId}{entity.Id}";
}
objrefs.Add(res, refID);
}
if (res is IJsonSerializable serializable)
{
//开始写入对象
if (serializable.JsonPayloadType != PayloadType.JsonResult)
{
writer.WriteStartObject();
}
if (serializable.JsonPayloadType != PayloadType.UnknownType && serializable.JsonPayloadType != PayloadType.JsonResult)
{
writer.WritePropertyName(TypePropertyName); // 写入对象类型
if (serializable.JsonPayloadType == PayloadType.Entity) //实体类写入的是持久化状态及模型标识
{
var entity = (Entity)res;
writer.WriteStringValue($"{(byte)entity.PersistentState}{entity.ModelId}");
if (entity.Model.SysStoreOptions != null)
{
writer.WritePropertyName(IdPropertyName); // 写入对象标识
writer.WriteStringValue((Guid)entity.Id);
}
else if (entity.Model.SqlStoreOptions != null)
{
//TODO:写入$Id标识，从WriteObjectRefs内累加标识计数器
}
}
else if (serializable.JsonPayloadType == PayloadType.ExtKnownType) //扩展类型写入反射信息
{
writer.WriteStringValue(type.FullName);
}
else
{
writer.WriteNumberValue((int)serializable.JsonPayloadType);
}
}
// 开始调用实现
serializable.WriteToJson(writer, objrefs);
//结束写入对象
if (serializable.JsonPayloadType != PayloadType.JsonResult)
{
writer.WriteEndObject();
}
}
else //----非实现了IJsonSerializable的对象---
{
if (type.IsPrimitive || type == typeof(string) || type == typeof(DateTime) ||
type == typeof(Guid) || type == typeof(decimal))
{
System.Text.Json.JsonSerializer.Serialize(writer, res, type);
}
else if (res is IList) // 优先转换IList集合
{
WriteList(writer, (IList)res, objrefs);
}
else if (res is IEnumerable) // 其他集合
{
WriteEnumerable(writer, (IEnumerable)res, objrefs);
}
else // 转换其他类型如匿名类和没有继承IJsonSerializable接口的类
{
//todo:***** 暂反射简单实现,另考虑缓存
var properties = type.GetProperties(System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.Instance);
writer.WriteStartObject();
for (int i = 0; i < properties.Length; i++)
{
writer.WritePropertyName(properties[i].Name);
writer.Serialize(properties[i].GetValue(res), objrefs);
}
writer.WriteEndObject();
}
}
}
