与API的LockScreen桌面使用WinRT的 [英] Using WinRT on the Desktop with LockScreen API

问题描述

我在写一个玩具的桌面应用程序，交互的的LockScreen API，这是的WinRT和用途异步/的await 。按照指示后，<一个href=\"http://blogs.msdn.com/b/eternalcoding/archive/2013/10/29/how-to-use-specific-winrt-api-from-desktop-apps-capturing-a-photo-using-your-webcam-into-a-wpf-app.aspx\"相对=nofollow>这里，我已经启用支持WinRT中，并添加以下参考资料：

  System.Runtime.dll
System.Runtime.WindowsRuntime.dll
System.Runtime.InteropServices.WindowsRuntime.dll
 

不过，我仍然得到这个错误，而建设：

'System.Runtime.CompilerServices.TaskAwaiter'不包含定义'IsCompleted

该错误与相关联的await 我的code线。还有什么我缺少什么？

编辑：这是有问题的code和项目引用的完整列表。

。

 使用系统;
使用System.Windows.Forms的;
使用System.Drawing中;
使用System.Runtime.InteropServices;
使用Windows.System.UserProfile;
使用System.IO;
使用Windows.Storage.Streams;公共类节目：表单
{
    [STAThread]
    静态无效的主要（）
    {
        ...
    }    公共项目（）
    {
        串壁纸= ...
        ...        SetLockScreenImage（墙纸）;
    }    私人异步无效SetLockScreenImage（字符串路径）
    {
        InMemoryRandomAccessStream RAS =新InMemoryRandomAccessStream（）;
        ...        等待LockScreen.SetImageStreamAsync（RAS）;
    }
}
 

引用

  Microsoft.CSharp
系统
System.Core程序
System.Data这
System.Data.DataSetExtension
System.Deployment
System.Drawing中
System.Runtime
System.Runtime.InteropServices.WindowsRuntime
System.Runtime.WindowsRuntime
System.Windows.Forms的
的System.Xml
System.Xml.Linq的
视窗
 

解决方案

我发现，64位PC上的目标平台设置为64可以解决这个问题。在<一个开发商href=\"http://social.msdn.microsoft.com/Forums/en-US/4df4323b-35cb-4816-b01c-082312109931/win8-desktop-app-use-lockscrrengetimagestream-problem?forum=windowsgeneraldevelopmentissues\"相对=nofollow>这个MSDN论坛主题解决了因为你是有类似的问题，虽然Windows 8的消费者preVIEW，所以很难说，如果解决方案仍然有效。

I'm writing a toy desktop app that interacts the LockScreen API, which is part of WinRT and uses async/await. After following the instructions here, I've enabled support for WinRT and added the following references:

System.Runtime.dll
System.Runtime.WindowsRuntime.dll
System.Runtime.InteropServices.WindowsRuntime.dll

However I still get this error while building:

'System.Runtime.CompilerServices.TaskAwaiter' does not contain a definition for 'IsCompleted'

The error is associated with the await line of my code. What else am I missing?

Edit: Here's the code in question and the full list of references for the project.

using System;
using System.Windows.Forms;
using System.Drawing;
using System.Runtime.InteropServices;
using Windows.System.UserProfile;
using System.IO;
using Windows.Storage.Streams;

public class Program : Form
{
    [STAThread]
    static void Main()
    {
        ...
    }

    public Program()
    {
        string wallpaper = ...
        ...

        SetLockScreenImage(wallpaper);
    }

    private async void SetLockScreenImage(string path)
    {
        InMemoryRandomAccessStream ras = new InMemoryRandomAccessStream();
        ...

        await LockScreen.SetImageStreamAsync(ras);
    }
}

References

Microsoft.CSharp
System
System.Core
System.Data
System.Data.DataSetExtension
System.Deployment
System.Drawing
System.Runtime
System.Runtime.InteropServices.WindowsRuntime
System.Runtime.WindowsRuntime
System.Windows.Forms
System.Xml
System.Xml.Linq
Windows

解决方案

I have found that setting target platform to x64 on 64-bit PC could resolve the issue. Developers on this MSDN forum thread were solving a similar problem as you are having, although for Windows 8 Consumer Preview, so it is hard to tell, if the solution is still valid.

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