如何在WCF服务C#中请求之前创建自定义标头

using System.ServiceModel.Channels;

public class CustomHeader : MessageHeader
{
    private string headerValue;

    public CustomHeader(string value)
    {
        this.headerValue = value;
    }

    public override string Name => "CustomHeader";

    public override string Namespace => "http://example.com/headers";

    protected override void OnWriteHeaderContents(XmlDictionaryWriter writer, MessageVersion messageVersion)
    {
        writer.WriteString(headerValue);
    }
}

using System.ServiceModel;
using System.ServiceModel.Channels;
using System.ServiceModel.Description;
using System.ServiceModel.Dispatcher;

public class CustomHeaderBehavior : IEndpointBehavior, IClientMessageInspector
{
    private string headerValue;

    public CustomHeaderBehavior(string value)
    {
        this.headerValue = value;
    }

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

    public void ApplyClientBehavior(ServiceEndpoint endpoint, ClientRuntime clientRuntime)
    {
        clientRuntime.ClientMessageInspectors.Add(this);
    }

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

    public void Validate(ServiceEndpoint endpoint)
    {
    }

    public object BeforeSendRequest(ref Message request, IClientChannel channel)
    {
        var customHeader = new CustomHeader(headerValue);
        request.Headers.Add(customHeader);

        return null;
    }

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

var endpointAddress = new EndpointAddress("http://example.com/MyService");
var binding = new BasicHttpBinding();
var customHeaderValue = "Custom Header Value";

var customHeaderBehavior = new CustomHeaderBehavior(customHeaderValue);

var channelFactory = new ChannelFactory<IMyService>(binding, endpointAddress);
channelFactory.Endpoint.EndpointBehaviors.Add(customHeaderBehavior);

var proxy = channelFactory.CreateChannel();