/// <summary>
/// Searches for extension methods exactly called 'Add'. Returns
/// <see cref="SymbolReference"/>s to the <see cref="INamespaceSymbol"/>s that contain
/// the static classes that those extension methods are contained in.
/// </summary>
private async Task <ImmutableArray <SymbolReference> > GetReferencesForCollectionInitializerMethodsAsync(SearchScope searchScope)
{
searchScope.CancellationToken.ThrowIfCancellationRequested();
if (!_owner.CanAddImportForMethod(_diagnosticId, _syntaxFacts, _node, out var nameNode))
{
return(ImmutableArray <SymbolReference> .Empty);
}
_syntaxFacts.GetNameAndArityOfSimpleName(_node, out var name, out var arity);
if (name != null || !_owner.IsAddMethodContext(_node, _semanticModel))
{
return(ImmutableArray <SymbolReference> .Empty);
}
var symbols = await searchScope.FindDeclarationsAsync(
nameof(IList.Add), nameNode : null, filter : SymbolFilter.Member).ConfigureAwait(false);
// Note: there is no desiredName for these search results. We're searching for
// extension methods called "Add", but we have no intention of renaming any
// of the existing user code to that name.
var methodSymbols = OfType <IMethodSymbol>(symbols).SelectAsArray(s => s.WithDesiredName(null));
var viableMethods = GetViableExtensionMethods(
methodSymbols, _node.Parent, searchScope.CancellationToken);
return(GetNamespaceSymbolReferences(searchScope,
viableMethods.SelectAsArray(m => m.WithSymbol(m.Symbol.ContainingNamespace))));
}
