通用处理程序未显示为可用选项。如何添加？

Question

我需要通用处理程序，但是当我尝试添加它时，它不在列表中。我看到了ASP.net处理程序，但没有看到通用处理程序。

我需要连接到Podio Webhook，并且按照http://podio.github.io/podio-dotnet/webhooks/上的说明进行操作

这是代码示例：

<%@ WebHandler Language="C#" Class="Handler" %>

using System;
using System.Web;
using PodioAPI;

public class Handler : IHttpHandler {

    public void ProcessRequest (HttpContext context) {

        // API key setup
        string clientId = "YOUR_CLIENT_ID";
        string clientSecret = "YOUR_CLIENT_SECRET";

        // Authentication setup
        int appId = 123456;
        string appToken = "YOUR_APP_TOKEN";

        // Setup client and authenticate
        var podio = new Podio(clientId, clientSecret);
        podio.AuthenticateWithApp(appId, appToken);

        // Big switch statement to handle the different events

        var request = context.Request;

        switch (request["type"])
        {
            case "hook.verify":
                podio.HookService.ValidateHookVerification(int.Parse(request["hook_id"]), request["code"]);
                break;
            // An item was created
            case "item.create":
                // For item events you will get "item_id", "item_revision_id" and "external_id". in post params
                int itemIdOfCreatedItem = int.Parse(request["item_id"]);
                // Fetch the item and do what ever you want
                break;

            // An item was updated
            case "item.update":
                // For item events you will get "item_id", "item_revision_id" and "external_id". in post params
                int itemIdOfUpdatedItem = int.Parse(request["item_id"]);
                // Fetch the item and do what ever you want
                break;

            // An item was deleted    
            case "item.delete":
                // For item events you will get "item_id", "item_revision_id" and "external_id". in post params
                int deletedItemId = int.Parse(request["item_id"]);
                break;
        }

    }

    public bool IsReusable {
        get {
            return false;
        }
    }

}