asp.net-web-api – 在运行时禁用ApiController

当您从Create方法返回null时,用户将收到404 Not Found消息.

我的示例显示正在检查应用程序设置(App.Config或Web.Config)中的值,但显然这可能是任何其他环境感知条件.

public class YourCustomControllerActivator : IHttpControllerActivator
{
    private readonly IHttpControllerActivator _default = new DefaultHttpControllerActivator();

    public YourCustomControllerActivator()
    {

    }

    public IHttpController Create(HttpRequestMessage request,HttpControllerDescriptor controllerDescriptor,Type controllerType)
    {
        if (ConfigurationManager.AppSettings["MySetting"] == "Off")
        {
            //Or get clever and look for attributes on the controller in controllerDescriptor.GetCustomAttributes<>(); 
            //Or use the contoller name controllerDescriptor.ControllerName
            //This example uses the type
            if (controllerType == typeof (MyController) ||
                controllerType == typeof (EtcController))
            {
                return null;
            }
        }
        return _default.Create(request,controllerDescriptor,controllerType);

    }
}

您可以像这样切换激活器：

GlobalConfiguration.Configuration.Services.Replace(typeof(IHttpControllerActivator),new YourCustomControllerActivator());

更新

自从我查看这个问题已经有一段时间了但是如果我今天要解决这个问题,我会稍微改变一下这个方法并使用自定义IHttpControllerSelector.这在激活器之前被调用,并且可以提高启用和禁用控制器的效率……(虽然另一种方法确实有效).您应该能够从DefaultHttpControllerSelector修饰或继承.