如何使Visual Studio 2010在Windows Phone项目上使用.NET 4.0而不是.NET 2.0？

问题描述：

这是一个Windows Phone 7项目。如何使Visual Studio 2010在Windows Phone项目上使用.NET 4.0而不是.NET 2.0？

由于一些奇怪的原因，Visual Studio 2010不允许我在项目设置“应用程序”选项卡中将目标.NET版本设置为.NET 4.0。它变灰了。

当我编译项目时，XNA程序集是.NET 4.0，但系统和System.Core，其余都是.NET 2.0。

当我说“添加引用”时，它不会让我选择任何.NET 4.0系统程序集，如mscorlib。

我卸载了.NET 4.0，然后重新安装它。没有帮助。

编辑：我的最终目标是让这个编译。为什么它为系统程序集选择.NET 2.0？

编辑：我得到这些错误：

C:\Windows\Microsoft.NET\Framework\v4.0.30319\Microsoft.Common.targets(1360,9): warning MSB3268: The primary reference "Microsoft.Xna.Framework.Video" could not be resolved because it has an indirect dependency on the framework assembly "mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" which could not be resolved in the currently targeted framework. ".NETFramework,Version=v4.0,Profile=Client". To resolve this problem, either remove the reference "Microsoft.Xna.Framework.Video" or retarget your application to a framework version which contains "mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089". 
C:\Windows\Microsoft.NET\Framework\v4.0.30319\Microsoft.Common.targets(1360,9): warning MSB3268: The primary reference "Microsoft.Xna.Framework.Net" could not be resolved because it has an indirect dependency on the framework assembly "mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" which could not be resolved in the currently targeted framework. ".NETFramework,Version=v4.0,Profile=Client". To resolve this problem, either remove the reference "Microsoft.Xna.Framework.Net" or retarget your application to a framework version which contains "mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089". 
C:\Windows\Microsoft.NET\Framework\v4.0.30319\Microsoft.Common.targets(1360,9): warning MSB3268: The primary reference "Microsoft.Xna.Framework.Avatar" could not be resolved because it has an indirect dependency on the framework assembly "mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" which could not be resolved in the currently targeted framework. ".NETFramework,Version=v4.0,Profile=Client". To resolve this problem, either remove the reference "Microsoft.Xna.Framework.Avatar" or retarget your application to a framework version which contains "mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089". 
C:\Windows\Microsoft.NET\Framework\v4.0.30319\Microsoft.Common.targets(1360,9): warning MSB3268: The primary reference "Microsoft.Xna.Framework.Storage" could not be resolved because it has an indirect dependency on the framework assembly "mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" which could not be resolved in the currently targeted framework. ".NETFramework,Version=v4.0,Profile=Client". To resolve this problem, either remove the reference "Microsoft.Xna.Framework.Storage" or retarget your application to a framework version which contains "mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089". 
C:\Windows\Microsoft.NET\Framework\v4.0.30319\Microsoft.Common.targets(1360,9): warning MSB3268: The primary reference "Microsoft.Xna.Framework.Xact" could not be resolved because it has an indirect dependency on the framework assembly "mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" which could not be resolved in the currently targeted framework. ".NETFramework,Version=v4.0,Profile=Client". To resolve this problem, either remove the reference "Microsoft.Xna.Framework.Xact" or retarget your application to a framework version which contains "mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089". 
C:\Windows\Microsoft.NET\Framework\v4.0.30319\Microsoft.Common.targets(1360,9): warning MSB3268: The primary reference "Microsoft.Xna.Framework.Net" could not be resolved because it has an indirect dependency on the framework assembly "System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" which could not be resolved in the currently targeted framework. ".NETFramework,Version=v4.0,Profile=Client". To resolve this problem, either remove the reference "Microsoft.Xna.Framework.Net" or retarget your application to a framework version which contains "System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089". 
C:\Windows\Microsoft.NET\Framework\v4.0.30319\Microsoft.Common.targets(1360,9): warning MSB3268: The primary reference "Microsoft.Xna.Framework.Xact" could not be resolved because it has an indirect dependency on the framework assembly "System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" which could not be resolved in the currently targeted framework. ".NETFramework,Version=v4.0,Profile=Client". To resolve this problem, either remove the reference "Microsoft.Xna.Framework.Xact" or retarget your application to a framework version which contains "System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089". 
C:\Windows\Microsoft.NET\Framework\v4.0.30319\Microsoft.Common.targets(1360,9): warning MSB3268: The primary reference "Microsoft.Xna.Framework.Xact" could not be resolved because it has an indirect dependency on the framework assembly "System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" which could not be resolved in the currently targeted framework. ".NETFramework,Version=v4.0,Profile=Client". To resolve this problem, either remove the reference "Microsoft.Xna.Framework.Xact" or retarget your application to a framework version which contains "System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089". 
C:\Windows\Microsoft.NET\Framework\v4.0.30319\Microsoft.Common.targets(1360,9): warning MSB3268: The primary reference "Microsoft.Xna.Framework.Xact" could not be resolved because it has an indirect dependency on the framework assembly "Microsoft.VisualC, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" which could not be resolved in the currently targeted framework. ".NETFramework,Version=v4.0,Profile=Client". To resolve this problem, either remove the reference "Microsoft.Xna.Framework.Xact" or retarget your application to a framework version which contains "Microsoft.VisualC, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a".

编辑： OK，我删除了这些问题的XNA组件。事实证明，我不需要他们。现在编译器回到这个错误：

error CS0518: Predefined type 'System.Object' is not defined or imported 

Compile complete -- 1 errors, 0 warnings

你试过手动编辑csproj文件吗？ – Mrchief

我该如何编辑它？ – 010110110101

在记事本或任何文本编辑器中打开.csproj文件并查找此“TargetFrameworkVersion”标签。示例：' v4.0 TargetFrameworkVersion>'。 – Mrchief

答

Visual Studio向您显示正确的程序集。您无法选择Windows Phone 7的.NET 4.0程序集，原因很简单，Windows Phone 7不运行.NET 4.0。

你看到的版本应该是这样的：。

Microsoft.Phone * - 7.0.0.0
Microsoft.XNA * - 4.0.0.0
mscorelib - 2.0.5.0
System。* - 2.0.5.0

我添加了我收到的错误。 – 010110110101

您很可能会添加对XNA框架的PC版本的引用，而不是电话版本。您需要发布.csproj文件，以获取更详细的帮助。 –

此外，您的引用未在Phone 7平台上列出为受支持（例如：http://msdn.microsoft.com/zh-cn/library/microsoft.xna.framework.media.video.aspx –

答

请检查您是否使用.NET框架或.NET框架客户端配置文件。如果它的客户端配置文件，将其更改回到.NET Framework。

Phone 7项目没有这种东西 –

答

Windows Phone使用Silverlight（Silverlight 3 for 7.0，Silverlight 4 for Mango），它不运行完整的.NET CLR，但使用子集完整.NET CLR的详细信息（请参阅Silverlight on Windows Phone,Silverlight Architecture上的MSDN链接）。因此，您无法使用.NET 4.0程序集甚至完全.NET 2.0程序集。

您可以看到的2.0.5.0版本号是特殊的Silverlight版本号 - 这些实际上并不是完整的.NET 2.0程序集。

但是这意味着您可以将一些Silverlight程序集添加到Windows Phone中（这是您为Silverlight单元测试框架所做的实例）。如果你这样做，那么你会得到一个警告，说明Windows Phone并不支持所有的桌面Silverlight。你只应该小心这样做，因为事情可能会破坏...

如何使Visual Studio 2010在Windows Phone项目上使用.NET 4.0而不是.NET 2.0？

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