0

我正在尝试将文件列表从 OneDrive 拉到列表中，并使用 MVC 应用程序将其显示到视图中。这是我第一次尝试，所以如果我遗漏了一些明显的东西，我深表歉意。我得到一个对象引用未设置为对象错误的实例。这是我的代码

public async Task<ActionResult> GetOneDriveFiles()
    {


        List<OneDriveFiles> myFilesList = new List<OneDriveFiles>();


        try
        {
       var fileResults = await _spFilesClient.Files.Take(10).ExecuteAsync();
        var files = fileResults.CurrentPage.OfType<Microsoft.Office365.SharePoint.File>().OrderBy(e => e.Name);


        foreach (File file in files)
        {
            OneDriveFiles myFile = new OneDriveFiles();
            myFile.Id = file.Id;
            myFile.Name = file.Name;
            myFile.Url = file.Url;
            myFile.Size = file.Size;
            myFile.TimeLastModified = file.TimeLastModified;

            myFilesList.Add(myFile);


        }

        }



       catch (RedirectRequiredException redir2)

        {
            return Redirect(redir2.RedirectUri.ToString());


        }
        return View(myFilesList);
    }

这是错误代码：

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error: 

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace: 


[NullReferenceException: Object reference not set to an instance of an object.]
   O365APIURSAITO.Controllers.<GetOneDriveFiles>d__14.MoveNext() +110
   System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +93
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +52
   System.Web.Mvc.Async.TaskAsyncActionDescriptor.EndExecute(IAsyncResult asyncResult) +84
   System.Web.Mvc.Async.<>c__DisplayClass37.<BeginInvokeAsynchronousActionMethod>b__36(IAsyncResult asyncResult) +17
   System.Web.Mvc.Async.WrappedAsyncResult`1.CallEndDelegate(IAsyncResult asyncResult) +10
   System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +49
   System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult) +32
   System.Web.Mvc.Async.AsyncInvocationWithFilters.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3d() +50
   System.Web.Mvc.Async.<>c__DisplayClass46.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3f() +225
   System.Web.Mvc.Async.<>c__DisplayClass33.<BeginInvokeActionMethodWithFilters>b__32(IAsyncResult asyncResult) +10
   System.Web.Mvc.Async.WrappedAsyncResult`1.CallEndDelegate(IAsyncResult asyncResult) +10
   System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +49
   System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethodWithFilters(IAsyncResult asyncResult) +34
   System.Web.Mvc.Async.<>c__DisplayClass2b.<BeginInvokeAction>b__1c() +26
   System.Web.Mvc.Async.<>c__DisplayClass21.<BeginInvokeAction>b__1e(IAsyncResult asyncResult) +100
   System.Web.Mvc.Async.WrappedAsyncResult`1.CallEndDelegate(IAsyncResult asyncResult) +10
   System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +49
   System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) +27
   System.Web.Mvc.Controller.<BeginExecuteCore>b__1d(IAsyncResult asyncResult, ExecuteCoreState innerState) +13
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +36
   System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +54
   System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +39
   System.Web.Mvc.Controller.<BeginExecute>b__15(IAsyncResult asyncResult, Controller controller) +12
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +28
   System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +54
   System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +29
   System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.EndExecute(IAsyncResult asyncResult) +10
   System.Web.Mvc.MvcHandler.<BeginProcessRequest>b__5(IAsyncResult asyncResult, ProcessRequestState innerState) +21
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +36
   System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +54
   System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +31
   System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +9
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +9651188
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155
4

1 回答 1

0

我的问题是我忘记确保创建了客户端。要在 try 语句的左括号之后执行此操作，请放置：

 public async Task<ActionResult> GetOneDriveFiles()
    {
        List<OneDriveModel> oneDriveFiles = new List<OneDriveModel>();

        try
        {


            await MyFilesApiSample.EnsureClientCreated();
            var allMyFiles = await MyFilesApiSample.GetMyFiles();
            foreach (var item in allMyFiles)
            {
                OneDriveModel newFile = new OneDriveModel();
                newFile.Name = item.Name;
                newFile.Url = item.Url;
                newFile.Size = item.Size;
                newFile.LastModified = item.TimeLastModified;

                oneDriveFiles.Add(newFile);
            }
        }
        catch (RedirectRequiredException ex)
        {
            return Redirect(ex.RedirectUri.ToString());
        }
        return View(oneDriveFiles);
    }
于 2014-08-28T21:57:31.407 回答