如何在每个请求中将winform自定义用户凭据传递给WCF服务？

public class MyCustomCredentials : ClientCredentials
{
    public string UserName { get; set; }
    public string Password { get; set; }
}

<system.serviceModel>
  <behaviors>
    <serviceBehaviors>
      <behavior name="MyServiceBehavior">
        <serviceCredentials>
          <userNameAuthentication userNamePasswordValidationMode="Custom" 
                                  customUserNamePasswordValidatorType="YourNamespace.YourCustomValidator, YourAssembly" />
        </serviceCredentials>
      </behavior>
    </serviceBehaviors>
  </behaviors>
</system.serviceModel>

MyCustomCredentials credentials = new MyCustomCredentials();
credentials.UserName = "your_username";
credentials.Password = "your_password";

YourWcfServiceProxy proxy = new YourWcfServiceProxy();
proxy.ClientCredentials.UserName.UserName = credentials.UserName;
proxy.ClientCredentials.UserName.Password = credentials.Password;

using (OperationContextScope scope = new OperationContextScope(proxy.InnerChannel))
{
    HttpRequestMessageProperty requestMessage = new HttpRequestMessageProperty();
    requestMessage.Headers["CustomUserName"] = credentials.UserName;
    OperationContext.Current.OutgoingMessageProperties[HttpRequestMessageProperty.Name] = requestMessage;

    // 发起请求
    proxy.YourServiceMethod();
}