如何避免异常反序列化无效的枚举项？ [英] How avoid exception deserializing an invalid enum item?

问题描述

为简便起见，我将使用水果展示示例代码。实际上，我正在做一些更有意义的事情（我们希望如此）。假设我们有一个枚举：

For simplicity purposes here, I will show my sample code using fruit. In actuality I am doing something more meaningful (we hope). Let say we have an enum:

public enum FruitType
{
    Apple,
    Orange,
    Banana
}

和一个班级：

[Serializable]
public class Fruit
{
    public FruitType FruitType { get; set; }
    public Fruit(FruitType type)
    {
        this.FruitType = type;
    }
}

我们可以对其进行序列化和反序列化。现在，让我们修改枚举，使其变为：

We can serialize and de-serialize it. Now, lets revise the enum, so that it is now:

public enum FruitType
{
    GreenApple,
    RedApple,
    Orange,
    Banana
}

反序列化先前序列化的对象时，您会得到 System.InvalidOperation 异常，作为 Apple （原始枚举项）无效。该对象不会反序列化。

When de-serializing previously serialized objects, you get a System.InvalidOperation exception as Apple (original enum item) is not valid. The object does not get de-serialized.

我能够解决此问题的一种方法是提供 FruitType Fruit 类中的属性按如下所示进行序列化时使用不同的名称：

One way I was able to resolve this was to give the FruitType property in the Fruit class a different name when it gets serialized as follows:

    [XmlElement(ElementName = "Mode")]
    public FruitType FruitType { get; set; }

现在，在反序列化期间，旧属性会被忽略，因为找不到它。我想知道是否有一种方法可以在反序列化期间忽略/跳过无效的枚举项，以便不引发任何异常，并且该对象仍然反序列化。

Now, during de-serialization the old property gets ignored as it is not found. I would like to know if there is a way to ignore/skip invalid enum items during de-serialization, so that no exception is thrown and the object still gets de-serialized.

推荐答案

保留 Apple 并用 ObsoleteAttribute 进行标记。这样，使用 Apple 的任何代码都将生成编译器警告。

Leave Apple and mark it with the ObsoleteAttribute. That way, any code using Apple will generate a compiler warning.

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