[英]Can WCF keep reference equality over the wire?
Say you have a few classes defined as 假设您定义了几个类
[DataContract]
public class Foo
{
[DataMember]
public List<Bar> Bars {get; set;}
}
[DataContract]
public class Bar
{
[DataMember]
public string Baz { get; set; }
}
public class Service1 : IService1
{
public bool Send(Foo foo)
{
var bars = foo.Bars;
bars[0].Baz = "test2";
return bars[0].Baz == bars[1].Baz;
}
}
[ServiceContract]
public interface IService1
{
[OperationContract]
bool Send(Foo composite);
}
Assuming I am using WCF to WCF with a shared data contract DLL between the client and server, if I do something like the following 假设我正在使用WCF与客户端和服务器之间的共享数据契约DLL WCF,如果我做类似以下的事情
static void Main(string[] args)
{
using (var client = new ServiceReference.Service1Client())
{
var bar = new Bar();
bar.Baz = "Start";
List<Bar> bars = new List<Bar>();
bars.Add(bar);
bars.Add(bar);
var foo = new Foo();
foo.Bars = bars;
Console.WriteLine(bars[0].Baz == bars[1].Baz);
bars[0].Baz = "test1";
Console.WriteLine(bars[0].Baz == bars[1].Baz);
Console.WriteLine(client.Send(foo));
Console.ReadLine();
}
}
I get True
, True
, False
as my result which means that bars[0]
and bars[1]
did not point to the same object on the server. 我得到
True
, True
, False
作为我的结果,这意味着bars[0]
和bars[1]
没有指向服务器上的同一个对象。
Am I doing something wrong, or is it impossible to have shared references over WCF? 我做错了什么,或者是不可能通过WCF共享引用?
You have to explicitly tell WCF to preserve references by specifying 您必须通过指定明确告诉WCF保留引用
[DataContract(IsReference = true)]
otherwise reference equality is lost during message construction. 否则在消息构造期间丢失引用相等性。
The DataContact
annotations indicate serialization. DataContact
注释表示序列化。 That is, your object is serialized, passed over the wire, and then re-constituted as a new object on the other end. 也就是说,您的对象被序列化,通过线路传递,然后在另一端重新构建为新对象。 So no, it's not possible to keep reference equality.
所以不,保持参考平等是不可能的。
Note that also, presumably, your WCF service is running on a different machine, or at least a different process. 请注意,也可能是您的WCF服务在不同的计算机上运行,或者至少在不同的进程上运行。 So the WCF service and client normally won't even have access to the same memory space, which means that sharing a reference between them is not practical in theory.
因此,WCF服务和客户端通常甚至不能访问相同的内存空间,这意味着在它们之间共享引用在理论上是不实际的。
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