英文:
Deserialize json into class with private constructor and readonly properties in C#
问题
I am using .NET的System.Text.Json来将JSON反序列化为不可变类。我想要隐藏该类的构造函数，以防止用户创建该类的实例，只能在反序列化时创建实例。如何使System.Text.Json使用非默认的私有构造函数？
我想要做类似这样的操作：
public class Sheet
{
public string Id { get; }
public IEnumerable<IEnumerable<SheetCell>> Data { get; }
[JsonConstructor]
private Sheet(string id, IEnumerable<IEnumerable<SheetCell>> data)
{
Id = id;
Data = data;
}
}
英文:
I am using .NET's System.Text.Json to deserialize json into an immutable class. I want to hide the constructor from the class user to prevent creating instances of this class and only create instances when deserializing. How can I make System.Text.Json use private constructor which is not default?
I want to do something like this:
public class Sheet
{
public string Id { get; }
public IEnumerable<IEnumerable<SheetCell>> Data { get; }
[JsonConstructor]
private Sheet(string id, IEnumerable<IEnumerable<SheetCell>> data)
{
Id = id;
Data = data;
}
}
答案1
得分: 1
以下是您要翻译的内容：
如果您不希望最终用户经常创建您的序列化类实例，您可以使用数据传输对象（DTO）模式来处理。在您的库代码中，您有用于序列化和反序列化的内部类，然后有一个单独的公共类对用户可见。
//在内部用这个类进行序列化和反序列化
internal class SheetDto
{
public string Id { get; init; }
public IEnumerable<IEnumerable<SheetCell>> Data { get; init; }
}
//最终用户只能访问这个公共类。
public class Sheet
{
public string Id { get; }
public IEnumerable<IEnumerable<SheetCell>> Data { get; }
private Sheet(SheetDto dto)
{
Id = dto.Id;
Data = dto.Data;
}
public static Sheet Deserialize()
{
//执行您需要的反序列化逻辑以获取SheetDto
//如果从文件反序列化，也许这个方法接受文件路径
var dto = someMethodToDeserialize();
return new Sheet(dto);
}
}
英文:
If you don't want the end user to create instances of your serialization class often you can handle that using a data transfer object (DTO) pattern. In your library code you have internal classes for serialization and deserialization, and then you have a separate public class that is exposed to the user.
//use this class internally for serializing and deserializing
internal class SheetDto
{
public string Id { get; init; }
public IEnumerable<IEnumerable<SheetCell>> Data { get; init; }
}
//the end user only has access to this public class.
public class Sheet
{
public string Id { get; }
public IEnumerable<IEnumerable<SheetCell>> Data { get; }
private Sheet(SheetDto dto)
{
Id = dto.Id;
Data = dto.Data;
}
public static Sheet Deserialize()
{
//do whatever deserializtion logic you need to get a SheetDto
//if deserializing from a file, maybe this method takes in a
//filepath
var dto = someMethodToDeserialize();
return new Sheet(dto);
}
}
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