c# - WCF List 序列化/反序列化错误

Question

我有以下 ServiceContract 和 DataContract 类:

[ServiceContract] 
public interface IWcfService 
{ 
    [OperationContract] 
    Response GetData(); 
} 

[DataContract]
public class Response 
{ 
    [DataMember] 
    public Dictionary<string, object> Data { get; set; } 
} 

当 Response.Data 字典的值为 int、string、double 或任何其他“简单”原始类型时，WCF 可以成功序列化该对象。但是当 Response.Data 字典的值为 List 类型时，客户端在接收到数据并尝试反序列化时抛出以下异常:

Message=The formatter threw an exception while trying to deserialize the message: 
There was an error while trying to deserialize parameter http://tempuri.org/:GetDataResult. 
The InnerException message was 'Error in line 1 position 990. 
    Element 'http://schemas.microsoft.com/2003/10/Serialization/Arrays:Value' contains data from a type 
    that maps to the name 'http://schemas.microsoft.com/2003/10/Serialization/Arrays:ArrayOfstring'. 
    The deserializer has no knowledge of any type that maps to this name. 
    Consider using a DataContractResolver or add the type corresponding to 'ArrayOfstring' 
    to the list of known types - for example, by using the KnownTypeAttribute attribute or 
    by adding it to the list of known types passed to DataContractSerializer.'.

我还尝试将 KnownType 属性添加到 ServiceContract 和 DataContract，如下所示:

[ServiceContract] 
[ServiceKnownType(typeof(List<string>))] 
[ServiceKnownType(typeof(Dictionary<string, string>))] 
[ServiceKnownType(typeof(Dictionary<string, List<string>>))] 
public interface IWcfService 
{ 
    [OperationContract] 
    [ServiceKnownType(typeof(List<string>))] 
    [ServiceKnownType(typeof(Dictionary<string, string>))] 
    [ServiceKnownType(typeof(Dictionary<string, List<string>>))] 
    Response GetData(); 
} 

[DataContract] 
[ServiceKnownType(typeof(List<string>))] 
[ServiceKnownType(typeof(Dictionary<string, string>))] 
[ServiceKnownType(typeof(Dictionary<string, List<string>>))] 
[KnownType(typeof(List<string>))] 
[KnownType(typeof(Dictionary<string, string>))] 
[KnownType(typeof(Dictionary<string, List<string>>))] 
public class Response 
{ 
    [DataMember] 
    public Dictionary<string, object> Data { get; set; } 
} 

但这一切都无济于事。有人对此有任何想法吗？

已更新

数据看起来像:

Data = new new DIctionary<string, object> 
       { 
           {"_id", 12344}, 
           {"names", new List<string>{ "John", "Peter", "Jack"}}, 
           {"time", DateTime.Now} 
       }

我们之所以使用Dictionary :服务器需要向客户端发送一个“动态”数据的字典，可以是int、List、DataTime等。使用Dictionary有助于解决这个问题，但也会丢失原始类型信息。例如，客户端需要 List 并进行一些数据绑定(bind)以显示集合，因此 List.ToString() 在这种情况下将无济于事。

Answer 1

我认为默认情况下 System.Object 不是 Serializable。您需要发送额外的信息，但这仍然不是最佳实践，我建议在使用您的字典之前定义一个单独的类型。

引用以下内容:

WCF service returning an array of dictionary

WCF System.Object Serialization

Serializing IDictionary in WCF