IExtensibleDataObject使用在客户端 [英] IExtensibleDataObject usage in clients

问题描述

我已经转换我的web服务，其中有一些datacontracts WCF服务。作为最佳实践它被提及，并建议这些DataContracts应该IExtensibleDataObject继承。我得到的是，除了或删除数据成员的情况下，IExtensibleDataObject是有帮助的地步。但我没能获得如何将客户端访问已删除数据成员。这里是我的代码：

<预类=郎-CS prettyprint-覆盖> [的ServiceContract（命名空间=htt​​p://mycompany.com/ 2010/08 /）]
公共类为MyWebService {
[OperationContract的]
公务员添加（员工EMP）
{
//一些处理
}
}

[DataContract（NAME =雇员，命名空间=htt​​p://mycompany.com/2010/08/）]
公共类员工：IExtensibleDataObject {
[数据成员]公共字符串名字;
[数据成员]公共字符串姓氏;

公共ExtensionDataObject ExtensionData {搞定;组; }
}


现在在我的Web服务的下一个版本我做了一些改动DataContract为

  [DataContract（NAME =雇员，命名空间=htt​​p://mycompany.com/2010/09/） ] 
公共类员工：IExtensibleDataObject {
 [数据成员]公共字符串名字; 
 [数据成员]公共字符串姓氏; 
 [数据成员（IsRequired =真）]公共字符串中间名; 
 
公共ExtensionDataObject ExtensionData {搞定;组; } 
} 
  

不过我的客户正在访问我的web服务的旧版本现在正错误不提供的中间名域。我仍然困惑的IExtensionDataObject的使用。

解决方案

恐怕这不是IExtensibleDataObject的正确用法，在IExtensibleDataObject接口旨在支持版本往返，对前向兼容性这个MSDN文章的读：

的 http://msdn.microsoft.com/en-us/library/ms731083.aspx

和这里是对一般的数据合同版本的最佳实践的另一篇文章：
http://msdn.microsoft .COM / EN-US /库/ ms733832.aspx

I have converted my web service to wcf service which has some datacontracts. As a best practice it is mentioned and advisable that the DataContracts should inherit from IExtensibleDataObject. I get the point that in case of addition or removal of datamembers, IExtensibleDataObject is helpful. But i am not able to get how will the clients access removed datamembers. Here is my code:

[ServiceContract(Namespace = "http://mycompany.com/2010/08/")]
public class MyWebService {
    [OperationContract]
    public Employee Add(Employee emp)
    {
        // Some Processing
    }
}

[DataContract(Name = "Employee", Namespace = "http://mycompany.com/2010/08/")]
public class Employee : IExtensibleDataObject {
    [DataMember] public string FirstName;
    [DataMember] public string LastName;

    public ExtensionDataObject ExtensionData  { get; set; }
}

Now in my next version of web service I made some changes to DataContract as

[DataContract(Name = "Employee", Namespace = "http://mycompany.com/2010/09/")]
public class Employee : IExtensibleDataObject {
    [DataMember] public string FirstName;
    [DataMember] public string LastName;
    [DataMember(IsRequired = true)] public string MiddleName;

    public ExtensionDataObject ExtensionData  { get; set; }
}

However my client that is accessing my older version of web service is now getting error for not supplying the MiddleName field. I am still confused for the usage of IExtensionDataObject.

解决方案

I'm afraid that's not the correct usage of IExtensibleDataObject, the IExtensibleDataObject interface is designed to support version round-tripping, have a read of this MSDN article on forward compatibility:

http://msdn.microsoft.com/en-us/library/ms731083.aspx

And here's another article on best practices on Data Contract versioning in general: http://msdn.microsoft.com/en-us/library/ms733832.aspx

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