c# – Ninject WithConstructorArgument：没有匹配的绑定可用,并

我有一个服务,让我们调用MyService,其构造函数正在使用多个对象,一个名为testEmail的字符串参数.对于此字符串参数,我添加了以下Ninject绑定：

string testEmail = "test@example.com";
kernel.Bind<IMyService>().To<MyService>().WithConstructorArgument("testEmail",testEmail);

但是,当执行以下代码行时,我会遇到异常：

var myService = kernel.Get<MyService>();

这是我得到的例外：

Error activating string No matching bindings are available,and the
type is not self-bindable. Activation path:
2) Injection of
dependency string into parameter testEmail of constructor of type
MyService
1) Request for MyService

Suggestions:
1) Ensure that you have defined a binding for string.
2) If the binding was defined in a module,ensure that the module has
been loaded into the kernel.
3) Ensure you have not accidentally
created more than one kernel.
4) If you are using constructor
arguments,ensure that the parameter name matches the constructors
parameter name.
5) If you are using automatic module loading,ensure
the search path and filters are correct.

我在这里做错了什么？

更新：

这是MyService构造函数：

[Ninject.Inject]
public MyService(IMyRepository myRepository,IMyEventService myEventService,IUnitOfWork unitOfWork,ILoggingService log,IEmailService emailService,IConfigurationManager config,HttpContextBase httpContext,string testEmail)
{
    this.myRepository = myRepository;
    this.myEventService = myEventService;
    this.unitOfWork = unitOfWork;
    this.log = log;
    this.emailService = emailService;
    this.config = config;
    this.httpContext = httpContext;
    this.testEmail = testEmail;
}

我有所有构造函数参数类型的标准绑定.只有’string’没有绑定,HttpContextBase有一个有点不同的绑定：

kernel.Bind<HttpContextBase>().ToMethod(context => new HttpContextWrapper(new HttpContext(new MyHttpRequest("","",null,new StringWriter()))));

MyHttpRequest定义如下：

public class MyHttpRequest : SimpleWorkerRequest
{
    public string UserHostAddress;
    public string RawUrl;

    public MyHttpRequest(string appVirtualDir,string appPhysicalDir,string page,string query,TextWriter output)
    : base(appVirtualDir,appPhysicalDir,page,query,output)
    {
        this.UserHostAddress = "127.0.0.1";
        this.RawUrl = null;
    }
}