我正在使用带有WebHttpBinding的 WCF 服务。我已经编写了自定义IDataContractSurrogate实现来将枚举序列化为字符串。
枚举是序列化工作,但反序列化失败。
当请求包含枚举时,我得到:
远程服务器返回意外响应:(400) 错误请求。
或者当响应包含枚举时,我得到:
InvalidCastException: Specified cast is not valid
Server stack trace:
at ReadMyResponseFromJson(XmlReaderDelegator , XmlObjectSerializerReadContextComplexJson , XmlDictionaryString , XmlDictionaryString[] )
at System.Runtime.Serialization.Json.JsonClassDataContract.ReadJsonValueCore(XmlReaderDelegator jsonReader, XmlObjectSerializerReadContextComplexJson context)
at System.Runtime.Serialization.Json.XmlObjectSerializerReadContextComplexJson.ReadDataContractValue(DataContract dataContract, XmlReaderDelegator reader)
at System.Runtime.Serialization.XmlObjectSerializerReadContext.InternalDeserialize(XmlReaderDelegator reader, String name, String ns, Type declaredType, DataContract& dataContract)
at System.Runtime.Serialization.XmlObjectSerializerReadContextComplex.InternalDeserializeWithSurrogate(XmlReaderDelegator xmlReader, Type declaredType, DataContract surrogateDataContract, String name, String ns)
at System.Runtime.Serialization.XmlObjectSerializerReadContextComplex.InternalDeserialize(XmlReaderDelegator xmlReader, Type declaredType, DataContract dataContract, String name, String ns)
at System.Runtime.Serialization.Json.DataContractJsonSerializer.InternalReadObject(XmlReaderDelegator xmlReader, Boolean verifyObjectName)
at System.Runtime.Serialization.XmlObjectSerializer.InternalReadObject(XmlReaderDelegator reader, Boolean verifyObjectName, DataContractResolver dataContractResolver)
at System.Runtime.Serialization.XmlObjectSerializer.ReadObjectHandleExceptions(XmlReaderDelegator reader, Boolean verifyObjectName, DataContractResolver dataContractResolver)
at System.Runtime.Serialization.Json.DataContractJsonSerializer.ReadObject(XmlDictionaryReader reader, Boolean verifyObjectName)
at ...
服务器代码:
string baseAddress = "http://localhost:8733/Design_Time_Addresses/FingerprintService/";
_serviceHost = new WebServiceHost(myServiceInstance, new Uri(baseAddress));
_serviceHost.AddServiceEndpoint(typeof (IMyService), new WebHttpBinding(WebHttpSecurityMode.None), baseAddress);
EndpointExtension.Setup(_serviceHost.Description.Endpoints[0]);
_serviceHost.Open();
客户端代码:
IMyService FingerprintService()
{
var channelFaftory = new WebChannelFactory<IMyService>(new Uri(TbxUri.Text));
EndpointExtension.Setup(channelFaftory.Endpoint);
return channelFaftory.CreateChannel();
}
端点设置(主机和客户端通用):
public static void Setup(ServiceEndpoint endpoint)
{
var webHttpBehavior = endpoint.Behaviors.Find<WebHttpBehavior>();
if (webHttpBehavior == null)
{
webHttpBehavior = new WebHttpBehavior();
endpoint.Behaviors.Add(webHttpBehavior);
}
foreach (OperationDescription opertion in endpoint.Contract.Operations)
{
var dataContractBehavior = opertion.Behaviors.Find<DataContractSerializerOperationBehavior>();
dataContractBehavior.DataContractSurrogate = new EnumSurrogate();
}
}
}
最后,代理人:
public class EnumSurrogate : IDataContractSurrogate
{
public Type GetDataContractType(Type type)
{
if (type.IsEnum)
{
return typeof(string);
}
return type;
}
public object GetObjectToSerialize(object obj, Type targetType)
{
if (obj is Enum)
{
return obj.ToString();
}
return obj;
}
public object GetDeserializedObject(object obj, Type targetType)
{
if (obj is string && targetType.IsEnum)
{
return Enum.Parse(targetType, (string)obj);
}
return obj;
}
//other methods throws NotImplementedException
}