public static bool TryGoToDefinition(
ISymbol symbol,
Project project,
ITypeSymbol containingTypeSymbol,
bool throwOnHiddenDefinition,
CancellationToken cancellationToken)
{
var alias = symbol as IAliasSymbol;
if (alias != null)
{
var ns = alias.Target as INamespaceSymbol;
if (ns != null && ns.IsGlobalNamespace)
{
return(false);
}
}
// VB global import aliases have a synthesized SyntaxTree.
// We can't go to the definition of the alias, so use the target type.
var solution = project.Solution;
if (symbol is IAliasSymbol &&
GeneratedCodeRecognitionService.GetPreferredSourceLocations(solution, symbol).All(l => project.Solution.GetDocument(l.SourceTree) == null))
{
symbol = ((IAliasSymbol)symbol).Target;
}
var definition = SymbolFinder.FindSourceDefinitionAsync(symbol, solution, cancellationToken).Result;
cancellationToken.ThrowIfCancellationRequested();
symbol = definition ?? symbol;
if (TryThirdPartyNavigation(symbol, solution, containingTypeSymbol))
{
return(true);
}
// If it is a partial method declaration with no body, choose to go to the implementation
// that has a method body.
if (symbol is IMethodSymbol)
{
symbol = ((IMethodSymbol)symbol).PartialImplementationPart ?? symbol;
}
var preferredSourceLocations = GeneratedCodeRecognitionService.GetPreferredSourceLocations(solution, symbol).ToArray();
if (GoToDefinitionService.TryNavigateToSymbol(symbol, project, true))
{
return(true);
}
else if (!preferredSourceLocations.Any())
{
return(false);
}
// If we have a single location, then just navigate to it.
if (preferredSourceLocations.Length == 1)
{
var firstItem = preferredSourceLocations[0];
var workspace = project.Solution.Workspace;
if (GoToDefinitionService.CanNavigateToSpan(workspace, solution.GetDocument(firstItem.SourceTree).Id, firstItem.SourceSpan))
{
return(GoToDefinitionService.TryNavigateToSpan(workspace, solution.GetDocument(firstItem.SourceTree).Id, firstItem.SourceSpan, true));
}
else
{
if (throwOnHiddenDefinition)
{
const int E_FAIL = -2147467259;
throw new COMException("The definition of the object is hidden.", E_FAIL);
}
else
{
return(false);
}
}
}
else
{
// We have multiple viable source locations, so ask the host what to do. Most hosts
// will simply display the results to the user and allow them to choose where to
// go.
GoToDefinitionService.DisplayMultiple(preferredSourceLocations.Select(location => Tuple.Create(solution, symbol, location)).ToList());
return(false);
}
}
