gistfile1.cs

public interface IErrorList
{
	void AddError(string message);
}

[Export(typeof(IErrorList)), PartCreationPolicy(CreationPolicy.Shared)]
public class ErrorList : IErrorList
{
	private static readonly Guid ProviderGuid = new Guid("A97E9FD2-1974-4889-8B3C-D4410164A229");
	private ErrorListProvider backProvider;

	[Import(typeof(SVsServiceProvider))]
	public IServiceProvider ServiceProvider { get; set; }

	public ErrorListProvider GetErrorListProvider()
	{
		return backProvider ?? (backProvider = new ErrorListProvider(ServiceProvider)
		                               	{
		                               		ProviderName = "HqlErrorProvider",
		                               		ProviderGuid = ProviderGuid
		                               	});
	}

	public void AddError(string message)
	{
		var provider = GetErrorListProvider();
		provider.Tasks.Add(new Task
		                   	{
						Text = message,
						Category = TaskCategory.BuildCompile,
					});
	}
}