仅作记录，方便以后查阅。
1. Reference related:
envdte
envdte80
envdte90
envdte100
Microsoft.VisualStudio.Shell.11.0
......
2. Create DTE instance
// way1
EnvDTE80.DTE2 _dte2 = (EnvDTE80.DTE2)System.Runtime.InteropServices.Marshal.GetActiveObject("VisualStudio.DTE.11.0");
// way2
Type visualStudioType = Type.GetTypeFromProgID("VisualStudio.DTE.11.0");
EnvDTE80.DTE2 _dte2 = Activator.CreateInstance(visualStudioType) as EnvDTE80.DTE2;
3. Get Service from DTE
很多时候，想取shell相关的service，但是用Package.GlobalProvider.GetService(xxx)不行，但是代码在extension和Addin里面可以，所以估计Package的使用范围有限制。
所以必须想办法从DTE去绕。
IVsUIShell vsUIShell = (new ServiceProvider(DTEInstance as Microsoft.VisualStudio.OLE.Interop.IServiceProvider)).GetService(typeof(SVsShell)) as IVsUIShell;
4. Some com interface not allowed used though they are public seen by refactor
自己动手重新包一遍，比如
[ComImport, InterfaceType(ComInterfaceType.InterfaceIsIUnknown), TypeIdentifier, Guid("0D915B59-2ED7-472A-9DE8-9161737EA1C5")]
public interface SVsColorThemeService
{
}
[ComImport, TypeIdentifier, Guid("EAB552CF-7858-4F05-8435-62DB6DF60684"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
public interface IVsColorThemeService
{
void _VtblGap1_4();
IVsColorThemes Themes { [return: MarshalAs(UnmanagedType.Interface)] get; }
object ColorNames { [return: MarshalAs(UnmanagedType.Interface)] get; }
IVsColorTheme CurrentTheme { [return: MarshalAs(UnmanagedType.Interface)] get; }
}
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