【发布时间】：2015-05-22 06:18:59
【问题描述】：
我有问题。我正在尝试修改我前一段时间制作的应用程序，它仍然可以在 WP Phone 上运行，但现在我尝试运行它得到以下错误：
等待我得到：
不能等待'void'。
当我将 void 更改为任务时，错误仍然是
不能等待'void'
我什至没有void 了。
有人可以帮我吗？
namespace StreamUploadDownload
{
using System.Threading;
public partial class Page1 : PhoneApplicationPage
{
private PhotoCamera _cam;
private double _canvasWidth;
private double _canvasHeight;
private MediaLibrary _library = new MediaLibrary();
public int count = 100;
private static readonly string[] scopes = new string[] { "wl.signin", "wl.basic", "wl.offline_access", "wl.skydrive_update", "wl.skydrive" };
string comboValue;
private LiveConnectClient liveClient;
public int x = 0;
public int y = 0;
public string FileText { get; set; }
public int ComboNumber { get; set; }
public int ConnectionOK { get; set; }
public Page1()
{
InitializeComponent();
}
private void OnSessionChanged(object sender, LiveConnectSessionChangedEventArgs e)
{
this.liveClient = (e.Status == LiveConnectSessionStatus.Connected) ? new LiveConnectClient(e.Session) : null;
if (e.Status == LiveConnectSessionStatus.Connected)
{
btnSignin.Visibility = Visibility.Collapsed;
Pildista.Visibility = Visibility.Visible;
//Pildista2K.Visibility = Visibility.Visible;
Pildista.Content = "Pildista";
}
else
{
Pildista.Visibility = Visibility.Collapsed;
//Pildista2K.Visibility = Visibility.Collapsed;
btnSignin.Visibility = Visibility.Visible;
}
}
protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e)
{
if ((PhotoCamera.IsCameraTypeSupported(CameraType.Primary) == true) ||
(PhotoCamera.IsCameraTypeSupported(CameraType.FrontFacing) == true))
{
if (PhotoCamera.IsCameraTypeSupported(CameraType.Primary))
{
_cam = new Microsoft.Devices.PhotoCamera(CameraType.Primary);
_cam.Initialized += new EventHandler<CameraOperationCompletedEventArgs>(cam_Initialized);
_cam.CaptureImageAvailable += new EventHandler<ContentReadyEventArgs>(cam_CaptureImageAvailable);
viewfinderBrush.SetSource(_cam);
//CameraButtons.ShutterKeyPressed += OnButtonFullPress;
base.OnNavigatedTo(e);
if (PhoneApplicationService.Current.State.ContainsKey("Text"))
{
txtvalue.Text = (string)PhoneApplicationService.Current.State["Text"];
FileText = txtvalue.Text;
}
if (PhoneApplicationService.Current.State.ContainsKey("index"))
{
ComboNumber = (int)PhoneApplicationService.Current.State["index"];
}
else
{
// The camera is not supported on the device.
this.Dispatcher.BeginInvoke(delegate()
{
// Write message.
});
// Disable UI.
AFButton.IsEnabled = false;
}
}
}
}
private double GetCameraAspectRatio()
{
IEnumerable<Size> resList = _cam.AvailableResolutions;
if (resList.Count<Size>() > 0)
{
Size res = resList.ElementAt<Size>(0);
return res.Width / res.Height;
}
return 1;
}
void cam_Initialized(object sender, Microsoft.Devices.CameraOperationCompletedEventArgs e)
{
if (e.Succeeded)
{
this.Dispatcher.BeginInvoke(delegate()
{
_canvasHeight = Application.Current.Host.Content.ActualWidth;
_canvasWidth = _canvasHeight * GetCameraAspectRatio();
viewfinderCanvas.Width = _canvasWidth;
viewfinderCanvas.Height = _canvasHeight;
});
}
}
//Failinime andmine ning salvestamine.
private async void cam_CaptureImageAvailable(object sender, Microsoft.Devices.ContentReadyEventArgs e)
{
if (ComboNumber == 1)
{
comboValue = "O";
}
if (ComboNumber == 2)
{
comboValue = "T";
}
if (ComboNumber == 3)
{
comboValue = "S";
}
if (ComboNumber == 4)
{
comboValue = "P";
}
if (ComboNumber == 5)
{
comboValue = "A";
}
if (ComboNumber == 6)
{
comboValue = "M";
}
string fileName = String.Format(FileText + "_" + comboValue + "_" + DateTime.Now.ToString("dd-MM-yyyy_HH-mm-ss") + ".jpg");
try
{
LiveOperationResult operationResult = await this.liveClient.UploadAsync("/me/skydrive", fileName, e.ImageStream, OverwriteOption.Overwrite); //Cannot await 'void'
}
catch (LiveConnectException ex)
{
// e.ImageStream.Close();
// this.infoTextBlock.Text = "Error getting contact info: ";
// this.infoTextBlock.Visibility = Visibility.Visible;
}
finally
{
e.ImageStream.Close();
y++;
Dispatcher.BeginInvoke(delegate()
{
string b = Convert.ToString(y);
loobvalue2.Text = b;
});
}
}
//kaameranupu vajutus.
private void takephoto_Click(object sender, RoutedEventArgs e)
{
if (_cam != null)
{
_cam.CaptureImage();
x++;
string s = x.ToString();
loobvalue.Text = s;
}
}
// Ühenduse Loomine. Session load.
private async void connectButton_Click(object sender, RoutedEventArgs e)
{
bool connected = false;
try
{
var authClient = new LiveAuthClient("RemovedforWeb");
LiveLoginResult result = await authClient.LoginAsync(new string[] { "wl.signin", "wl.skydrive" }); // cannot await 'void'
if (result.Status == LiveConnectSessionStatus.Connected)
{
connected = true;
var connectClient = new LiveConnectClient(result.Session);
var meResult = await connectClient.GetAsync("me");
dynamic meData = meResult.Result; //cannot await 'void'
}
else
{
//btnSignin.Visibility = Visibility.Visible;
}
}
catch (LiveAuthException ex)
{
}
编辑：我添加了更多代码，并对有问题的地方发表了评论
【问题讨论】：
-
你有两个等待，一个用于
authClient.LoginAsync，一个用于connectClient.GetAsync。这些应该返回Task<LiveLoginResult>和Task<T>，其中T 是meResult的类型。他们中的任何一个都返回void或Task？ -
你说的是哪一行代码？
-
你的错误是在另一个城堡。请显示其余代码和带有堆栈跟踪的完整错误消息。
-
@MariusBancila 当他将 Task 作为这些方法之一的返回类型时，错误消息将类似于“无法将类型 void 转换为 LiveLoginResult 或 meResult 应该是什么。因此，如果错误确实出在那段代码中，那肯定是
authClient.LoginAsync或connectClient.GetAsync的类型为 void。 -
代码太多。请保留Minimal, Complete, and Verifiable。
标签： c# windows-phone-8 void