wcf 序列化继承 class 错误

Question

我们有两个名为 "Frontend"(FE[= 的 控制台应用程序 50=]) 和 "Backend"(BE),

由 WCF 连接。我需要一个 摘要 class 和一些

在 BE 中继承了 classes，在运行时我从
之一实例化了一个对象
Activator 继承的 classes。

每当我想要 return 实例化对象时，就会出现与
相关的错误
序列化。这是我的简化代码

[DataContract] public abstract class License { [DataMember] public int ManagedObjectCount { get; set; } } [DataContract] public class LicenseMay2018 : License { public Frontend.DataTypes.License GetLicenseInfo(xml xml) { Frontend.DataTypes.LicenseMay2018 licenseVerified; var licXML = nodeData[0].InnerText; //Deserialize license XmlSerializer _serializer = new XmlSerializer(typeof(LicenseMay2018)); using (StringReader _reader = new StringReader(licXML)) { licenseVerified = (Frontend.DataTypes.LicenseMay2018)_serializer.Deserialize(_reader); } } } [DataContract] public class LicenseApril2018 : License { }

在 BE 方面，我 return 通过抽象 class 的类型，期望 return 继承 class，通过 Activator 和实例化，一切都很好。唯一的问题是在方法的最后，当它想 return 到 FE 时，似乎序列化并发回

public Frontend.DataTypes.License ActivateLicense(int LicenseFileId) { // create in instance of inehrited class, no matter licensemay2018 or april2018 string assemblyName = "NMS.Common"; var className = GetLicenseType(nodeVersion[0].InnerText); // exaple : className = licensemay2018 var handle = Activator.CreateInstance(assemblyName, className); var instance = (Frontend.DataTypes.License)handle.Unwrap(); return instance.GetLicenseInfo(xmlDoc); }

在运行时我不知道确切的类型所以我按父类型创建实例 class，它工作并且创建了确切的对象

在returning的时候会出现这个错误

There was an error while trying to serialize parameter http://tempuri.org/:ActivateLicenseResult. The InnerException message was 'Type 'NMS.Frontend.DataTypes.LicenseMay2018' with data contract name 'LicenseMay2018:http://schemas.datacontract.org/2004/07/NMS.Frontend.DataTypes' is not expected. Consider using a DataContractResolver if you are using DataContractSerializer or add any types not known statically to the list of known types - for example, by using the KnownTypeAttribute attribute or by adding them to the list of known types passed to the serializer.'. Please see InnerException for more details.

我不知道这些来自哪里：http://tempuri.org and http://schemas.datacontract.org/2004/07 ??

Answer 1

您需要将您的继承类型告知序列化程序。像这样

为您的继承类添加 KnownType 属性

[DataContract]
[KnownType(typeOf(LicenseMay2018))]
[KnownType(typeOf(LicenseApril2018))]
public abstract class License
{

    [DataMember]
    public int ManagedObjectCount { get; set; }
}

[DataContract]
public class LicenseMay2018 : License
{

    public Frontend.DataTypes.License GetLicenseInfo(xml xml)
    {
        return new licenseMay2018();
    }

}

[DataContract]
public class LicenseApril2018 : License
{
}

wcf 序列化继承 class 错误

wcf serialization inherited class error

c#

xml

serialization

abstract-class

datacontractserializer