如何解决＆QUOT; “IAsyncActionWithProgress＆LT;＆GT;'在不引用＆QUOT一个组件被限定;在Windows应用UAP [英] How to resolve " 'IAsyncActionWithProgress<>' is defined in an assembly that is not referenced" in Windows UAP app

问题描述

我正在开发在Visual Studio旗舰版CTP 2015年一个Windows应用程序UAP（最近一次在网站上提供）。

I am developing a Windows UAP app in Visual Studio Ultimate CTP 2015 (latest one available in site).

我在使用等待关于函数返回的问题，面临的 IAsyncActionWithProgress＆LT;>，IAsyncAction＆LT;>，IAsyncOperation＆LT;>和IAsyncOperationWithProgress＆LT;>

I am facing issues while using await on Functions returning IAsyncActionWithProgress<>, IAsyncAction<> , IAsyncOperation<> and IAsyncOperationWithProgress<>.

我收到以下错误

错误
CS0012
类型'IAsyncActionWithProgress＆LT;>'在未引用的程序集定义。您必须添加一个引用程序集的Windows，版本= 255.255.255.255，文化=中性公钥= NULL，则contentType = WindowsRuntime'。

我尝试添加引用提到的组件（Windows）中。尽管这解决了上面的错误，它在其他许多地方创造了另一个错误（好像有两个程序集的一些类/ API的一个重复中获得的错误是：

I tried adding reference to the assembly mentioned (Windows). Even though this resolved the above error, it created another error at many other places (seems like there is a repetition of some classes/API's in both the assemblies. One of the error obtained is :

错误
CS0433
类型页存在于两个'Windows.Foundation.UniversalApiContract，版本= 1.0.0.0，文化=中性公钥= NULL，则contentType = WindowsRuntime和Windows，版本= 255.255.255.255，文化=中立，公钥=空，则contentType = WindowsRuntime'。

code示例

Windows.Storage.FileProperties.BasicProperties fileSize = await file.GetBasicPropertiesAsync();

在Visual Studio 2013的Windows Phone 8.1的应用程序这是工作的罚款。
什么是我必须做出得到同样的结果在UAP应用程序在Visual Studio 2015年的变化。

This was working fine for a Windows Phone 8.1 app in Visual Studio 2013. What is the change I have to make to get the same result in UAP App in Visual Studio 2015.

推荐答案

我曾与IAsyncAction同样的问题，我刚才已经设法解决它，所以我要分享的（也许不是最好的）解决方案。

I had the same problem with the IAsyncAction and I have just managed to solve it, so I am going to share the (maybe not the best) solution.

首先，我试图修复VS，没有成功。然后再重新安装VS，又没有成功。于是我去控制面板 - >程序 - >卸载程序，并从那里我卸载时候有一些东西需要与Visual Studio或.NET的一切。这显示了我一对夫妇的错误，这样的一些应用程序需要此程序运行，但我无论如何卸载它（如果我需要它，我会重新安装）。之后，我又安装了Visual Studio，写了code造成错误，并且它的工作，没有错误。

First I tried repair VS, no success. Then reinstalling VS, again no success. So I went to control panel -> programs -> uninstall programs, and from there I uninstalled everything that had something to do with Visual Studio or .NET. It displayed me a couple of errors, like that some applications require this program to run, but i anyway uninstalled it (if I will need it I will install it again). After that I installed Visual Studio again, wrote the code which caused the error and, it worked, with no error.

希望这可以帮助你，因为它确实帮助我。

Hope this helps you as it did help me.

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