是否有更多 customUserNamePasswordValidatorType 实例？

Question

customUserNamePasswordValidatorType 是否只有一个实例，或者每个“应用程序”可能有多个实例？
如果有更多实例，是否在某处写入逻辑，何时创建它们（例如，每次登录一个实例，每小时或其他）？

Answer 1

据我所知，customUserNamePasswordValidatorType 仅存在一个实例。无论 WCF 应用程序以何种方式运行，单个实例或多个实例，对于使用该服务的每个人来说，始终存在一个验证逻辑实例。

using (WebServiceHost sh = new WebServiceHost(typeof(MyService), uri))
{
    sh.AddServiceEndpoint(typeof(IService), binding, "");
    ServiceMetadataBehavior smb;
    smb = sh.Description.Behaviors.Find<ServiceMetadataBehavior>();
    if (smb == null)
    {
        smb = new ServiceMetadataBehavior()
        {
            HttpGetEnabled = true
        };
        sh.Description.Behaviors.Add(smb);
    }
    sh.Credentials.UserNameAuthentication.UserNamePasswordValidationMode = System.ServiceModel.Security.UserNamePasswordValidationMode.Custom;
    sh.Credentials.UserNameAuthentication.CustomUserNamePasswordValidator = new CustUserNamePasswordVal();
    Binding mexbinding = MetadataExchangeBindings.CreateMexHttpBinding();
    sh.AddServiceEndpoint(typeof(IMetadataExchange), mexbinding, "mex");
    sh.Opened += delegate
    {
        Console.WriteLine("Service is ready");
    };
    sh.Closed += delegate
    {
        Console.WriteLine("Service is clsoed");
    };
    sh.Open();
    Console.ReadLine();
    //pause
    sh.Close();
    Console.ReadLine();
}

还有验证类，UserNamePasswordValidator。

    internal class CustUserNamePasswordVal : UserNamePasswordValidator
    {
        public override void Validate(string userName, string password)
        {
            if (userName != "jack" || password != "123456")
            {
                throw new FaultException("Username/Password is not correct");
            }
        }
}

官方链接。
https://docs.microsoft.com/en-us/dotnet/framework/wcf/feature-details/how-to-use-a-custom-user-name-and-password-validator
https://docs.microsoft.com/en-us/dotnet/framework/wcf/samples/user-name-password-validator
也许我不完全理解你的意思，如果有什么我可以帮助的，请随时告诉我。