在 xml 序列化期间忽略属性，但在反序列化期间不忽略

Ignore a property during xml serialization but not during deserialization(在 xml 序列化期间忽略属性，但在反序列化期间不忽略)

问题描述

在 C# 中，如何让 XmlSerializer 在序列化期间忽略属性，但在反序列化期间不忽略?(或者我如何对 Json.net 做同样的事情?)

In C#, how can I make XmlSerializer ignore a property during serialization but not during deserialization? (Or how do I do the same with Json.net?)

要防止属性被序列化，可以添加 XmlIgnore 属性:

To prevent a property from being serialized, you can add the XmlIgnore attribute:

[XmlIgnore]
public int FooBar {get;set;}

这会导致<FooBar>标签在序列化过程中被省略.

This will cause the <FooBar> tag to be omitted during serialization.

不过，这也意味着<FooBar>标签在反序列化时会被忽略.

However, this also means that the <FooBar> tag will be ignored during deserialization.

在我的例子中，我在请求中接受来自用户的一组项目，如果用户想要添加、修改或删除项目，他们可以为每个项目指定一个操作属性.我想对 GET 列表调用使用相同的模型对象，并且不想返回此操作属性.我预计这将是一个很常见的情况.

In my case, I accept an array of items from user in the request, and for each item user can specify an action property if they want to add, modify or delete the item. I want to use the same model object for GET list calls, and don't want to return this action property. I expect this would be a pretty common case.

另一个用例:假设你有一个圆形对象

Another use case: say you have a circle object

public class Circle
{
    public double Radius { get; set; }
}

然后你修改它以添加一个直径属性

and you modify it to add a diameter property

public class Circle2
{
    public double Diameter { get; set; }
    public double Radius { get { return Diameter / 2; } set { Diameter = value*2; } }
}

您可能只想序列化直径，但仍然能够反序列化仅包含半径的旧格式的 xml 文件.

You may want to serialize only the diameter, but still be able to deserialize xml files in the old format that contain only the radius.

我做了我的研究，没有发现任何东西，因此提出了这个问题

I did my research and didn't find anything, hence this question

解决方案:我想出了解决方案.我可以在 这个 MSDN 文档

Solution: I figured out the solution. I can add a ShouldSerialize property which always return false, details at this MSDN documentation

(如果重新打开这个问题，这个解决方案可以作为实际答案添加)

推荐答案

如果你想用 XmlSerializer 在序列化时忽略元素，你可以使用 XmlAttributeOverrides:

If you want to ignore the element at serialization with XmlSerializer, you can use XmlAttributeOverrides:

XmlAttributeOverrides overrides = new XmlAttributeOverrides();
XmlAttributes attribs = new XmlAttributes();
attribs.XmlIgnore = true;
attribs.XmlElements.Add(new XmlElementAttribute("YourElementName"));
overrides.Add(typeof(YourClass), "YourElementName", attribs);

XmlSerializer ser = new XmlSerializer(typeof(YourClass), overrides);
ser.Serialize(...

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