我有一个WPF C＃应用程序托管在附加到Travis的GitHub上。我用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，我会收到这些错误：
/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的Windows机器上本地编译项目工作正常。因此，我包含了项目所需的所有参考资料。
这也适用于更多参考文献：
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'
在编译之前，所需的包恢复正常：
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