Show ErrorList Windows in Visual Studio 2010 Addin - visual-studio-2010

Question

I have Win7 64 bits, Visual Studio 2010, and I have developed an Addin for Vs2010.
I try show messages in Error List Windows VS.
I use ErrorListProvider in OnBuildProjConfigDone build event for Addin
this._buildEvents.OnBuildProjConfigDone += new _dispBuildEvents_OnBuildProjConfigDoneEventHandler(_buildEvents_OnBuildProjConfigDone);
I get this error InvalidOperationException
The service 'Microsoft.VisualStudio.Shell.Interop.IVsTaskList' must be
installed for this feature to work. Ensure that this service is
available.
Connect
public partial class Connect : IDTExtensibility2, IDTCommandTarget, System.Windows.Forms.IWin32Window, IOleCommandTarget
OnBuildProjConfigDone
void _buildEvents_OnBuildProjConfigDone(string project, string projectConfig, string platform, string solutionConfig, bool success)
{
// Omitted
if (!resul)
{
project.DTE.ExecuteCommand("Build.Cancel");
var errorListHelper = new ErrorListHelper();
ErrorListProvider errorProvider = errorListHelper.GetErrorListProvider();
var newError = new ErrorTask();
newError.ErrorCategory = TaskErrorCategory.Message;
newError.Category = TaskCategory.BuildCompile;
newError.Text = "Cualquier mensaje de error aqui";
errorProvider.Tasks.Add(newError);
}
}
ErrorListHelper
public class ErrorListHelper : System.IServiceProvider
{
public ErrorListProvider GetErrorListProvider()
{
ErrorListProvider provider = new ErrorListProvider(this);
provider.ProviderName = "Provider";
provider.ProviderGuid = System.Guid.NewGuid();
return provider;
}
public object GetService(Type serviceType)
{
return Package.GetGlobalService(serviceType);
}
}
Suggestion by #JohnL: I put a breakpoint in my GetService method and Package.GetGlobalService is returning null.
Any suggestions?

Answer 1

Ryan Molden (MSFT) says:
Package.GetGlobalService is relying on at least one MPF package (from
the specific version of MPF you are referencing) having been loaded.
Since you yourself are an AddIn not a Package you can't guarantee that
in any way.
You should pass something like new
ServiceProvider((Microsoft.VisualStudio.OLE.Interop.IServiceProvider))) as the argument to ErrorListProvide
Package.GetGlobalService is returning null.
I use this code in my Addin. I test it and I get not error, and I can show errors and warnings in ErrorList Windows VS. I'll testing more for safely.
public partial class Connect
{
ErrorListProvider _errorListProvider = null;
void CreateErrorListProvider()
{
if (_errorListProvider == null)
{
System.IServiceProvider serviceProvider = new ServiceProvider(_applicationObject as Microsoft.VisualStudio.OLE.Interop.IServiceProvider);
_errorListProvider = new ErrorListProvider(serviceProvider);
_errorListProvider.ProviderName = "custom Errors";
_errorListProvider.ProviderGuid = new Guid("xxxxxxxxxxxxxx");
}
}