IFileDialogService can't import

[Sunng210]

I write a demo to try WAF, when I try to use FileDialog, I used IFileDialogService, but it throw an exception, it says can't find the export ContractName="System.Waf.Applications.Services.IFileDialogService".

This is my import code.
[ImportingConstructor]
public ShellViewModel(IShellView view, IFileDialogService fileDialogService)
: base(view)
{
exitCommand = new DelegateCommand(Close);
fileDialogService = this.fileDialogService;
}

Thanks.

[jbe2277]

This error comes when the System.Waf.Wpf assembly is not registered via MEF. Add the following line:

waf/src/System.Waf/Samples/Writer/Writer.Presentation/App.xaml.cs

Line 72 in 7e33fc8

catalog.Catalogs.Add(new AssemblyCatalog(typeof(IMessageService).Assembly));