Question

我有一个运行.NETFramework 4.6.1的应用程序，对抽象类和继承类型使用xml序列化，其方法几乎与此XML Serialization and Inherited Types相同，并且效果很好。但在将应用程序移植到UWP .NETCore之后，我遇到了一个奇怪的异常。这是一个重现它的简单例子。

public class ClassToSerialize
{
    [XmlElement(Type = typeof(CustomSerializer<AnotherOne>))]
    public AnotherOne anotherOne;

    public ClassToSerialize()
    {
    }
}

public abstract class AnotherOne
{
    public AnotherOne()
    {
    }
}

public class CustomSerializer<TType> : IXmlSerializable
{
    public CustomSerializer()
    {
    }

    public CustomSerializer(TType data)
    {
        m_data = data;
    }

    public static implicit operator CustomSerializer<TType>(TType data)
    {
        return data == null ? null : new CustomSerializer<TType>(data);
    }

    public static implicit operator TType(CustomSerializer<TType> obj)
    {
        return obj.m_data;
    }

    private TType m_data;

    public XmlSchema GetSchema()
    {
        return null;
    }

    public void ReadXml(XmlReader reader)
    {
    }

    public void WriteXml(XmlWriter writer)
    {
    }
}

为此类型创建XmlSerializer

XmlSerializer sr = new XmlSerializer(typeof(ClassToSerialize));

导致异常

System.InvalidOperationException：TestApp.AnotherOne，TestApp，Version = 1.0.0.0，Culture = neutral，PublicKeyToken = null不能从TestApp.CustomSerializer`1 [[TestApp.AnotherOne，TestApp，Version = 1.0.0.0，Culture]中分配= neutral，PublicKeyToken = null]]，TestApp，Version = 1.0.0.0，Culture = neutral，PublicKeyToken = null。

相同的代码适用于.netframework应用。他们在.netcore中改变了什么，或者我错过了什么？

Answer 1

您的问题与代表序列化类型的类型相关联。对于通用应用程序，它们必须来自（我可以看到）例如：

[TestClass]
public class UnitTest1
{
    [TestMethod]
    public void TestMethod1()
    {
        XmlSerializer sr = new XmlSerializer(typeof(ClassToSerialize));
        var demo = new DemoChild();
        var ser = new ClassToSerialize {anotherOne = demo};
        var stream = new MemoryStream();
        sr.Serialize(stream, ser);
    }
}

public class ClassToSerialize
{
    [XmlElement(Type = typeof(DemoChild))]
    public AnotherOne anotherOne;

    public ClassToSerialize()
    {
    }
}

public abstract class AnotherOne : IXmlSerializable
{
    protected AnotherOne()
    {
    }

    public XmlSchema GetSchema()
    {
        return null;
    }

    public void ReadXml(XmlReader reader)
    {
    }

    public void WriteXml(XmlWriter writer)
    {
    }
}

public class DemoChild: AnotherOne
{
}

使用通用序列化器对您来说很重要吗？我已经在通用应用单元测试中进行了测试，并且所有工作都正常。

P.S。 Type - 从成员类型派生的对象的类型。来自文档

Answer 2

使用XAML序列化程序：

nuget> Install-Package Portable.Xaml

public class ClassToSerialize
{
    public AnotherOne anotherOne { get; set; }

    public ClassToSerialize()
    {
    }
}


public abstract class AnotherOne
{
    public AnotherOne()
    {
    }
}

public class ContainerOne : AnotherOne
{
    public uint placeholder = 0xdeadcafe;
}



public void Test()
{
    ClassToSerialize obj = new ClassToSerialize();
    obj.anotherOne = new ContainerOne();

    //or FileStream..
    using (MemoryStream ms = new MemoryStream())
    {
        Portable.Xaml.XamlServices.Save(ms, obj);
        ms.Seek(0, SeekOrigin.Begin);
        ClassToSerialize obj2 = Portable.Xaml.XamlServices.Load(ms) as ClassToSerialize;
    }
}

Answer 3

尝试从Nuget下载System.Xml.XmlSerializer。我认为它是在.NETStandard中开发的这里lists all versions of .NET Standard and the platforms supported

.NETCore XmlSerializer错误

3 个答案: