检索日历信息失败，返回null？ [英] Retrieving Calendar information fails with null?

问题描述

我有这个代码从Goolge Calendar Api v.3获取日历信息。我已经成功创建了Google控制台帐户，并生成了客户端ID和密码。



当我运行此代码时，它失败并返回空值。异常：System.ObjectDisposedException未处理。使用以下代码行：

Hi, I have this code for getting Calendar information from Goolge Calendar Api v.3. and I have already created Google console account successfully and generated a client id and secret code.

when I run this code, it fails with null values. Exception : System.ObjectDisposedException was unhandled. with this lines of code:

credential =  GoogleWebAuthorizationBroker.AuthorizeAsync(
          new ClientSecrets
          {
              ClientId = "id",
              ClientSecret = "secret"
          },
          new[] { CalendarService.Scope.Calendar },
          "user",
          CancellationToken.None,
          new FileDataStore(@"G:\CalendarCsharp")).Result;

static class Program
   {

       static IList<string> scopes = new List<string>();
       static CalendarService service;
       public static void Main()
       {

           scopes.Add(CalendarService.Scope.Calendar);


           Console.WriteLine("Google.Apis.Calendar.v3");
           Console.WriteLine("==============================");

           UserCredential credential = default(UserCredential);

         credential =  GoogleWebAuthorizationBroker.AuthorizeAsync(
         new ClientSecrets
         {
             ClientId = "id",
             ClientSecret = "secretcode"
         },
         new[] { CalendarService.Scope.Calendar },
         "user",
         CancellationToken.None,
         new FileDataStore(@"G:\CalendarCsharp")).Result;

           BaseClientService.Initializer initializer = new BaseClientService.Initializer();
           initializer.HttpClientInitializer = credential;
           initializer.ApplicationName = "CalendarSample";
           service = new CalendarService(initializer);

           IList<CalendarListEntry> list = service.CalendarList.List().Execute().Items;

           DisplayList(list);
           foreach (Google.Apis.Calendar.v3.Data.CalendarListEntry calendar in list)
           {

               DisplayFirstCalendarEvents(calendar);
           }

           Console.WriteLine("Press any key to continue...");
           Console.ReadKey();
       }

       private static void DisplayList(IList<CalendarListEntry> list)
       {
           Console.WriteLine("Lists of calendars:");
           foreach (CalendarListEntry item in list)
           {
               Console.WriteLine(item.Summary + ". Location: " + item.Location + ", TimeZone: " + item.TimeZone);
           }
       }


       }

   }

推荐答案

程序失败，有两个内部异常，我不知道如何捕获内部异常。首先，我想出如何使用此代码捕获内部异常：

The program failed with two inner exceptions and I had no idea how to catch the inner exception. First I figured out how to catch the inner exceptions using this code :

try
  {
     // your code for getting Calendar values, events etc.
  }
  catch (AggregateException ex)
  {
      foreach (var e in ex.InnerExceptions)
      {
          Console.WriteLine("ERROR: " + e.Message+" "+e.StackTrace);
      }
  }

首例异常：该程序抛出了一个笨拙的线程异常。要解决此问题，我必须使用nuget为Microsoft Async 1.0.166安装最新版本的软件包。



第二例外：该程序无法找到FileDataStore方法，为了解决这个问题，我将之前的代码改为此代码：

First Exception : The program was throwing a clumsy Thread Exception. To fix this issue, I had to install a latest version of a package for Microsoft Async 1.0.166 using nuget.

Second Exception : The program was not able to find FileDataStore Method, To fix this I changed my previous code to this one :

UserCredential credential;
           using (var stream = new FileStream("client_secrets.json", FileMode.Open, FileAccess.Read))
           {

               credential = await GoogleWebAuthorizationBroker.AuthorizeAsync(
                   GoogleClientSecrets.Load(stream).Secrets,
                   new[] { CalendarService.Scope.Calendar },
                   "user", CancellationToken.None);

           }

           var service = new CalendarService(new BaseClientService.Initializer()
           {
               HttpClientInitializer = credential,
               ApplicationName = "CalendarApp",
           });
await DisplayList(service);

          await credential.RefreshTokenAsync(CancellationToken.None);
          // Request should fail now - invalid grant.
          try
          {
              await DisplayList(service);
          }
          catch (TokenResponseException ex)
          {
              Console.WriteLine(ex.Error);
          }

          // Reauthorize the user. A browser should be opened, and the user should enter his or her credential again.
          await GoogleWebAuthorizationBroker.ReauthorizeAsync(credential, CancellationToken.None);

          // The request should succeed now.
          await DisplayList(service);
       }

       private async Task DisplayList(CalendarService service)
       {
           // Execute async.
           var list = await service.CalendarList.List().ExecuteAsync();
           if(list.Items==null)
           {
               Console.WriteLine("There is no Calendar");
               return;
           }
           Console.WriteLine("Lists of calendars:");
           foreach (CalendarListEntry item in list.Items)
           {
               Console.WriteLine("Item:"+item.Location+"  "+item.Summary);
           // await DisplayFirstCalendarEvents(item, service);
           }
       }

这就是全部。

that's all.

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