Question

是否有可能向每个请求/消息发送一些上下文信息？例如。自动注入首选语言，在FrontEnd中选择用户并使其可用于任何请求，而无需为每个操作调用发送参数。

任何想法都表示赞赏。

Answer 1

在客户端，添加端点行为：

public class AddHeaderBehavior : IEndpointBehavior
{
    public void Validate(ServiceEndpoint endpoint)
    {
    }

    public void AddBindingParameters(ServiceEndpoint endpoint, BindingParameterCollection bindingParameters)
    {
    }

    public void ApplyDispatchBehavior(ServiceEndpoint endpoint, EndpointDispatcher endpointDispatcher)
    {
    }

    public void ApplyClientBehavior(ServiceEndpoint endpoint, ClientRuntime clientRuntime)
    {
        clientRuntime.MessageInspectors.Add(new HeaderMessageInspector());
    }
}

public class HeaderMessageInspector: IClientMessageInspector
{
    public object BeforeSendRequest(ref Message request, IClientChannel channel)
    {
        var typedHeader = new MessageHeader<string>("my custom info");
        var untypedHeader = typedHeader.GetUntypedHeader("myKey", "myNamespace");

        request.Headers.Add(untypedHeader);
        return null;
    }

    public void AfterReceiveReply(ref Message reply, object correlationState)
    {
    }
}

在服务器端，添加服务行为：

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

    public void ApplyDispatchBehavior(ServiceDescription serviceDescription, System.ServiceModel.ServiceHostBase serviceHostBase)
    {
        foreach (var channelDispatcherBase in serviceHostBase.ChannelDispatchers)
        {
            var cDispatcher = (ChannelDispatcher)channelDispatcherBase;
            foreach (var eDispatcher in cDispatcher.Endpoints)
            {
                eDispatcher.DispatchRuntime.MessageInspectors.Add(new OrganizationHeaderMessageInspector());
            }
        }
    }

    void IServiceBehavior.Validate(ServiceDescription serviceDescription, System.ServiceModel.ServiceHostBase serviceHostBase)
    {
    }
}

public class HeaderMessageInspector : IDispatchMessageInspector
{
    public object AfterReceiveRequest(ref Message request, IClientChannel channel, InstanceContext instanceContext)
    {
        var header = request.Headers.GetHeader<string>("myKey", "myNamespace");

        if (header != null)
        {
            OperationContext.Current.IncomingMessageProperties.Add("myKey", header);
        }

        return null;
    }

    public void BeforeSendReply(ref Message reply, object correlationState)
    {
    }
}

WCF - 发送每个请求/消息的上下文信息

1 个答案: