System.Text.Json API 是否有类似 IContractResolver 的东西 [英] System.Text.Json API is there something like IContractResolver
问题描述
在新的 System.Text.Json 中;命名空间是否有类似 IContractResolver 的东西,我正在尝试将我的项目从 Newtonsoft 迁移.
In the new System.Text.Json; namespace is there something like IContractResolver i am trying to migrate my project away from Newtonsoft.
这是我想转移的课程之一:
This is one of the classes i am trying to move:
public class SelectiveSerializer : DefaultContractResolver
{
private readonly string[] fields;
public SelectiveSerializer(string fields)
{
var fieldColl = fields.Split(',');
this.fields = fieldColl
.Select(f => f.ToLower().Trim())
.ToArray();
}
protected override JsonProperty CreateProperty(MemberInfo member, MemberSerialization memberSerialization)
{
var property = base.CreateProperty(member, memberSerialization);
property.ShouldSerialize = o => fields.Contains(member.Name.ToLower());
return property;
}
}
推荐答案
System.Text.Json 中的等效类型 --
JsonClassInfo
和JsonPropertyInfo
-- 是内部的.有一个开放的增强相当于 System.Text.Json 中的 DefaultContractResolver #31257要求公共等价物.– dbc 11 月 25 日 19:11
The equivalent types in System.Text.Json --
JsonClassInfo
andJsonPropertyInfo
-- are internal. There is an open enhancement Equivalent of DefaultContractResolver in System.Text.Json #31257 asking for a public equivalent. – dbc Nov 25 at 19:11
Github 问题:
- 开放 System.Text.Json 的元数据基础结构 #34456
- 相当于 System.Text.Json 中的 DefaultContractResolver.CreateProperties 覆盖 #60518
- 相当于 System.Text.Json 中的 DefaultContractResolver #31257
请试试这个:
我将其作为 System.Text.Json 的扩展编写,以提供缺失的功能:https://github.com/dahomey-technologies/Dahomey.Json.
您会发现对编程对象映射的支持.
You will find support for programmatic object mapping.
定义您自己的 IObjectMappingConvention 实现:
Define your own implementation of IObjectMappingConvention:
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:
Setup json extensions by calling on JsonSerializerOptions the extension method SetupExtensions defined in the namespace Dahomey.Json:
JsonSerializerOptions options = new JsonSerializerOptions();
options.SetupExtensions();
为类注册新的对象映射约定:
Register the new object mapping convention for the class:
options.GetObjectMappingConventionRegistry().RegisterConvention(
typeof(Employee), new SelectiveSerializer("FirstName,Email,Id"));
然后使用常规 Sytem.Text.Json API 序列化您的类:
Then serialize your class with the regular Sytem.Text.Json API:
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"};
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