在C#中键入转换问题，在.NET中键入wcf标题

我现在正在使用visual studio 2013开发WCF服务。“我的服务”包含必须传递的自定义标头字段。字段名是我开发的

“lisenseKey”

。WCF服务运行良好。现在我将调用我的服务进行测试。我向客户端项目添加了一个服务引用。现在我这样打电话：

MyService.Myservice proxy = new MyService.Myservice();
proxy.LisenseKey = "xxxxxx";
Label1.Text = proxy.GetMessage(TextBox1.Text);

当我像这样分配许可证密钥值时，它用红色下划线显示错误：

“无法将类型字符串隐式转换为MyService.MyService.string”

---

在这种情况下如何输入cast？或者有没有办法通过标题？我不知道如何使用

“MessageHeader”

这是我的服务代码。我只是尝试使用“GetMessage”方法

[服务合同]
公共接口IMyservice
{
[经营合同]
无效销钉（）；
[经营合同]
字符串GetMessage（字符串名称）；
}
公共类MyServiceMessageInspector:System.ServiceModel.Dispatcher.IDispatchMessageInspector
{
公共对象AfterReceiveRequest（参考System.ServiceModel.Channels.Message request，System.ServiceModel.IClientChannel，
System.ServiceModel.InstanceContext（InstanceContext）
{
if（request.Headers.FindHeader（“LisenseKey”，即“”）=-1）
{
抛出新的FaultException（“未提供Lisense密钥”）；
}
var lisenseKey=request.Headers.GetHeader（“lisenseKey”，即“”）；
if（string.IsNullOrEmpty（lisenseKey））
{
抛出新的FaultException（“Lisnse密钥无效”）；
}
如果（lisenseKey！=“12345x”）
{
抛出新的FaultException（“Lisense密钥无效”）；
}
返回instanceContext；
}
SendReply之前的公共无效（参考System.ServiceModel.Channels.Message reply，object correlationState）
{
}
}
公共类MyServiceMessageInspectorBehavior:属性，System.ServiceModel.Description.IServiceBehavior
{
public void AddBindingParameters（System.ServiceModel.Description.ServiceDescription ServiceDescription，
System.ServiceModel.ServiceHostBase ServiceHostBase，
System.Collections.ObjectModel.Collection终结点，
System.ServiceModel.Channel.BindingParameterCollection绑定参数）
{
}
public void ApplyDispatchBehavior（System.ServiceModel.Description.ServiceDescription ServiceDescription，
System.ServiceModel.ServiceHostBase（服务主机库）
{
foreach（serviceHostBase.ChannelDispatchers中的ChannelDispatcher ChannelDispatcher）
{
foreach（channelDispatcher.Endpoints中的var endpointDispatcher）
{
endpointDispatcher.DispatchRuntime.MessageInspectors.Add（新的MyServiceMessageInspector（））；
}
}
}
公共无效验证（System.ServiceModel.Description.ServiceDescription ServiceDescription，System.ServiceModel.ServiceHostBase ServiceHostBase）
{
}
}

您可以发布服务代码吗？这是我的服务代码。谁能帮我一下吗。我只是想使用“GetMessage”服务

[ServiceContract]
    public interface IMyservice
    {
        [OperationContract]
        void DoWork();

        [OperationContract]
        string GetMessage(string name);
    }

    public class MyServiceMessageInspector:System.ServiceModel.Dispatcher.IDispatchMessageInspector
    {
        public object AfterReceiveRequest(ref System.ServiceModel.Channels.Message request,System.ServiceModel.IClientChannel channel,
            System.ServiceModel.InstanceContext instanceContext)
        {
            if(request.Headers.FindHeader("LisenseKey","")==-1)
            {
                throw new FaultException("Lisense Key Was Not Provided");
            }

            var lisenseKey = request.Headers.GetHeader<string>("LisenseKey", "");
            if (string.IsNullOrEmpty(lisenseKey))
            {
                throw new FaultException("Lisnse key is not valid");
            }

            if(lisenseKey!="12345x")
            {
                throw new FaultException("Lisense key is not valid");
            }

            return instanceContext;
        }

        public void BeforeSendReply(ref System.ServiceModel.Channels.Message reply,object correlationState)
        {

        }
    }

    public class MyServiceMessageInspectorBehaviour:Attribute,System.ServiceModel.Description.IServiceBehavior
    {
        public void AddBindingParameters(System.ServiceModel.Description.ServiceDescription serviceDescription,
            System.ServiceModel.ServiceHostBase serviceHostBase,
            System.Collections.ObjectModel.Collection<System.ServiceModel.Description.ServiceEndpoint> endpoints,
            System.ServiceModel.Channels.BindingParameterCollection bindingParameters)
        {

        }

        public void ApplyDispatchBehavior(System.ServiceModel.Description.ServiceDescription serviceDescription,
            System.ServiceModel.ServiceHostBase serviceHostBase)
        {
            foreach(ChannelDispatcher channelDispatcher in serviceHostBase.ChannelDispatchers)
            {
                foreach(var endpointDispatcher in channelDispatcher.Endpoints)
                {
                    endpointDispatcher.DispatchRuntime.MessageInspectors.Add(new MyServiceMessageInspector());
                }
            }
        }

        public void Validate(System.ServiceModel.Description.ServiceDescription serviceDescription,System.ServiceModel.ServiceHostBase serviceHostBase)
        {

        }
    }