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WCF向客户端发送对象时出现问题

serialization wcf c#

quip · 技术社区 · 16 年前

从使用.Net远程处理转换为WCF。WCF服务器上的大多数方法都工作正常,但遇到了一个今天不工作的方法。

[ServiceContract]
public interface IMyService
{
  [OperationContract]
  generated.Response.ACS_Response Check(generated.Request.ACS_Request request);
}

ACS_Response和ACS_request的类是根据XSD文件使用XSD.exe生成的。这些类驻留在WCF客户端和WCF主机都引用的Api程序集中。

我打开了WCF的跟踪,并看到SerializationException说:

Type 'Api.generated.Response.ACS_ResponseQuestion'
with data contract name 'ACS_ResponseQuestion:http://...' is
not expected.  Add any types not known statically.........

问题

首先,我很困惑,因为我能够成功地发送一个请求对象,所以看起来基础工作正常。

第三,主机和客户端都引用定义这些类的相同Api程序集,因此服务器和客户端都知道这些类。

3 回复 | 直到 16 年前

Philip Wallace 16 年前

我相信是因为 Api.generated.Response.ACS_ResponseQuestion

阅读这些文章,他们应该解释一切:

[KnownType(typeof(Api.generated.Response.ACS_ResponseQuestion))]

如果这不起作用,您可能必须将其声明为 ServiceKnownType :

// Define a service contract and apply the ServiceKnownTypeAttribute
// to specify types to include when generating client code. 
// The types must have the DataContractAttribute and DataMemberAttribute
// applied to be serialized and deserialized. The attribute specifies the 
// name of a method (GetKnownTypes) in a class (Helper) defined below.
[ServiceKnownType("GetKnownTypes", typeof(Helper))]
[ServiceContract()]
public interface ICatalog
{
    // Any object type can be inserted into a Hashtable. The 
    // ServiceKnownTypeAttribute allows you to include those types
    // with the client code.
    [OperationContract]
    Hashtable GetItems();
}

// This class has the method named GetKnownTypes that returns a generic IEnumerable.
static class Helper
{
    public static IEnumerable<Type> GetKnownTypes(ICustomAttributeProvider provider)
    {
        System.Collections.Generic.List<System.Type> knownTypes =
            new System.Collections.Generic.List<System.Type>();
        // Add any types to include here.
        knownTypes.Add(typeof(Widget));
        knownTypes.Add(typeof(Machine));
        return knownTypes;
    }
}

[DataContract()]
public class Widget
{
    [DataMember]
    public string Id;
    [DataMember]
    public string Catalog;
}

[DataContract()]
public class Machine : Widget
{
    [DataMember]
    public string Maker;
}