c# - XmlSerializer 在枚举上抛出异常

Question

对于以下代码，XmlSerializer 会抛出一个预期，因为 Foo 包含两个与枚举 EnumSameName 同名的属性。

框架.NET 4.0

public class Bar1
{
    public enum EnumSameName
    {
        a
    }

    public EnumSameName MyBar1Enum { get; set; }
}

public class Bar2
{
    public enum EnumSameName
    {
        b
    }

    public EnumSameName MyBar2Enum { get; set; }
}

public class Foo
{
    public Foo()
    {
        MyEnum1 = new Bar1();
        MyEnum2 = new Bar2();
    }

    public Bar1 MyEnum1 { get; set; }

    public Bar2 MyEnum2 { get; set; }
}

现在尝试序列化Foo

var parameter = new Foo();
var serializer = new XmlSerializer(parameter.GetType()); 
// ERROR System.InvalidOperationException: [...]

重命名 EnumSameName 之一后，一切都按预期工作。

这个错误从何而来？

Answer 1

有问题的错误信息应该是

Types 'Bar2.EnumSameName' and 'Bar1.EnumSameName' both use the XML type name, 'EnumSameName', from namespace ''. Use XML attributes to specify a unique XML name and/or namespace for the type.

看看

XML Namespace Collisions, XmlNodeList and Deserialization, and More

你可以尝试把代码改成

[XmlRoot("Bar1", Namespace = "http://example.com/schemas/Bar1")]
public class Bar1
{
    [XmlRoot("Bar1EnumSameName", Namespace = "http://example.com/schemas/Bar1")]
    public enum EnumSameName
    {
        a
    }

    public EnumSameName Mode { get; set; }
}

[XmlRoot("Bar2", Namespace = "http://example.com/schemas/Bar2")]
public class Bar2
{
    [XmlRoot("Bar2EnumSameName", Namespace = "http://example.com/schemas/Bar2")]
    public enum EnumSameName
    {
        b
    }

    public EnumSameName Mode { get; set; }
}

作为事后的想法，只需添加 XmlRoot documentation

Controls XML serialization of the attribute target as an XML root element.