属性路由不适用于两个或更多控制器

运行时系统。ArgumentException正在“GlobalConfiguration.Configure(WebApiConfig.Register);”上生成在全球范围内。asax显示消息:

“路径段不能包含两个连续的参数。它们必须 由“/”或文本字符串分隔。“

这是FirstController.cs

     [System.Web.Http.RoutePrefix("api/First")]
 public class FirstController : ApiController
 {
     [System.Web.Http.HttpGet]
     [System.Web.Http.Route("Method1/{Param1}/{Param2}")]
     public int Method1(string Param1, string Param2)
     {
       //
     }
     [System.Web.Http.HttpGet]
     [System.Web.Http.Route("Method2/{Param1}/{Param2}")]
     public int Method2(string Param1, string Param2)
     {
       //
     }
 }

这是SecondController.cs

[System.Web.Http.RoutePrefix("api/Second")]
 public class SecondController : ApiController
 {
     [System.Web.Http.HttpGet]
     [System.Web.Http.Route("Method3/{Param1}/{Param2}")]
     public int Method3(string Param1, string Param2)
     {
       //
     }
     [System.Web.Http.HttpGet]
     [System.Web.Http.Route("Method4/{Param1}/{Param2}")]
     public int Method4(string Param1, string Param2)
     {
       //
     }
 }

这是我的全球。asax(以JSON格式返回数据)

protected void Application_Start()
    {
        GlobalConfiguration.Configuration.Formatters.JsonFormatter.SerializerSettings.ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore;
        GlobalConfiguration.Configuration.Formatters.Remove(GlobalConfiguration.Configuration.Formatters.XmlFormatter);
        GlobalConfiguration.Configure(WebApiConfig.Register);
    }

我正在尝试创建具有自己默认路由的多个控制器。请帮忙。