System.Text.Json -JsonClassInfo
和JsonPropertyInfo
- 中的等效类型是internal。System.Text.Json #31257中有一个 DefaultContractResolver 的开放增强
等效项,
要求提供一个公共等效项。– dbc 11 月 25 日 19:11
Github问题:
请试试这个:
我把它写成 System.Text.Json 的扩展来提供缺少的功能:https ://github.com/dahomey-technologies/Dahomey.Json 。
您会发现对编程对象映射的支持。
定义自己的 IObjectMappingConvention 实现:
public class SelectiveSerializer : IObjectMappingConvention
{
private readonly IObjectMappingConvention defaultObjectMappingConvention = new DefaultObjectMappingConvention();
private readonly string[] fields;
public SelectiveSerializer(string fields)
{
var fieldColl = fields.Split(',');
this.fields = fieldColl
.Select(f => f.ToLower().Trim())
.ToArray();
}
public void Apply<T>(JsonSerializerOptions options, ObjectMapping<T> objectMapping) where T : class
{
defaultObjectMappingConvention.Apply<T>(options, objectMapping);
foreach (IMemberMapping memberMapping in objectMapping.MemberMappings)
{
if (memberMapping is MemberMapping<T> member)
{
member.SetShouldSerializeMethod(o => fields.Contains(member.MemberName.ToLower()));
}
}
}
}
定义你的类:
public class Employee
{
public int Id { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
public string Email { get; set; }
}
通过调用命名空间 Dahomey.Json 中定义的扩展方法 SetupExtensions 调用 JsonSerializerOptions 来设置 json 扩展:
JsonSerializerOptions options = new JsonSerializerOptions();
options.SetupExtensions();
为类注册新的对象映射约定:
options.GetObjectMappingConventionRegistry().RegisterConvention(
typeof(Employee), new SelectiveSerializer("FirstName,Email,Id"));
然后使用常规的 Sytem.Text.Json API 序列化你的类:
Employee employee = new Employee
{
Id = 12,
FirstName = "John",
LastName = "Doe",
Email = "john.doe@acme.com"
};
string json = JsonSerializer.Serialize(employee, options);
// {"Id":12,"FirstName":"John","Email":"john.doe@acme.com"};