【发布时间】：2016-06-13 08:00:37
【问题描述】：
我在 Travis 的 GitHub 上托管了一个 WPF C# 应用程序。我以这种方式配置了我的 .travis-ci.yml：
language: csharp
solution: FaceDetection/FaceDetection.sln
script:
- xbuild /p:Configuration=Debug /p:Platform=x86 /p:TargetFrameworkVersion="v4.0" FaceDetection/FaceDetection.sln
但是，当项目即将由 travis 编译时，我得到了这些错误：
/usr/lib/mono/4.5/Microsoft.Common.targets: warning : Reference 'PresentationCore' not resolved
/usr/lib/mono/4.5/Microsoft.Common.targets: warning : Reference 'PresentationFramework' not resolved
在 VS 中在我的 windows 机器上本地编译项目工作正常。因此，我包含了该项目所需的所有参考资料。
这也发生在一些参考文献上：
Views/Converters/BitmapConverter.cs(5,28): error CS0234: The type or namespace name `Imaging' does not exist in the namespace `System.Windows.Media'. Are you missing an assembly reference?
Views/UserControls/FaceDatabaseEntry.xaml.cs(7,22): error CS0234: The type or namespace name `Controls' does not exist in the namespace `System.Windows'. Are you missing an assembly reference?
Views/UserControls/FaceDatabaseEntry.xaml.cs(9,22): error CS0234: The type or namespace name `Documents' does not exist in the namespace `System.Windows'. Are you missing an assembly reference?
Views/UserControls/FaceDatabaseEntry.xaml.cs(12,28): error CS0234: The type or namespace name `Imaging' does not exist in the namespace `System.Windows.Media'. Are you missing an assembly reference?
Views/UserControls/FaceDatabaseEntry.xaml.cs(13,22): error CS0234: The type or namespace name `Navigation' does not exist in the namespace `System.Windows'. Are you missing an assembly reference?
Views/UserControls/FaceDatabaseEntry.xaml.cs(14,22): error CS0234: The type or namespace name `Shapes' does not exist in the namespace `System.Windows'. Are you missing an assembly reference?
ViewModel/AddFaceViewModel.cs(13,38): error CS0012: The type `System.ComponentModel.INotifyPropertyChanged' is defined in an assembly that is not referenced. Consider adding a reference to assembly `System.ObjectModel, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
在即将编译之前，所需的包已恢复正常：
Installing 'PostSharp.Patterns.Model 4.2.27'.
Installing 'System.Data.SQLite.Linq 1.0.101.0'.
Installing 'PostSharp.Patterns.Common 4.2.27'.
Installing 'ZedGraph 5.1.7'.
Installing 'MahApps.Metro 1.3.0-ALPHA160'.
Installing 'MvvmLight 5.3.0.0'.
Installing 'DirectShowLib 1.0.0'.
Installing 'System.Data.SQLite.Core 1.0.101.0'.
Installing 'CommonServiceLocator 1.3'.
Installing 'System.Data.SQLite.EF6 1.0.101.0'.
Installing 'PostSharp 4.2.27'.
Installing 'System.Data.SQLite 1.0.101.0'.
Installing 'OpenTK 1.1.2349.61993'.
Installing 'EmguCV 3.1.0'.
Installing 'OpenTK.GLControl 1.1.2349.61993'.
Installing 'EntityFramework 6.1.3'.
Successfully installed 'PostSharp.Patterns.Model 4.2.27'.
Successfully installed 'PostSharp.Patterns.Common 4.2.27'.
Successfully installed 'DirectShowLib 1.0.0'.
Successfully installed 'MvvmLight 5.3.0.0'.
Successfully installed 'ZedGraph 5.1.7'.
Successfully installed 'CommonServiceLocator 1.3'.
Successfully installed 'OpenTK 1.1.2349.61993'.
Successfully installed 'System.Data.SQLite.Linq 1.0.101.0'.
Successfully installed 'PostSharp 4.2.27'.
Successfully installed 'System.Data.SQLite 1.0.101.0'.
Successfully installed 'OpenTK.GLControl 1.1.2349.61993'.
Successfully installed 'System.Data.SQLite.EF6 1.0.101.0'.
Successfully installed 'EntityFramework 6.1.3'.
Successfully installed 'MahApps.Metro 1.3.0-ALPHA160'.
Successfully installed 'MvvmLightLibs 5.3.0.0'.
Successfully installed 'System.Data.SQLite.Core 1.0.101.0'.
Successfully installed 'EmguCV 3.1.0'.
mono 和 xbuild 的版本：
$ mono --version
Mono JIT compiler version 4.2.3 (Stable 4.2.3.4/832de4b Wed Mar 16 13:19:08 UTC 2016)
Copyright (C) 2002-2014 Novell, Inc, Xamarin Inc and Contributors. www.mono-project.com
TLS: __thread
SIGSEGV: altstack
Notifications: epoll
Architecture: amd64
Disabled: none
Misc: softdebug
LLVM: supported, not enabled.
GC: sgen
$ xbuild /version
XBuild Engine Version 12.0
Mono, Version 4.2.3.0
Copyright (C) 2005-2013 Various Mono authors
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