ICSharpCode.NRefactory.CSharp.Resolver.CSharpResolver.LookInCurrentUsingScope C# (CSharp) Method

		ResolveResult LookInCurrentUsingScope(string identifier, IList<IType> typeArguments, bool isInUsingDeclaration, bool parameterizeResultType)
		{
			// look in current namespace definitions
			ResolvedUsingScope currentUsingScope = this.CurrentUsingScope;
			for (ResolvedUsingScope u = currentUsingScope; u != null; u = u.Parent) {
				var resultInNamespace = LookInUsingScopeNamespace(u, u.Namespace, identifier, typeArguments, parameterizeResultType);
				if (resultInNamespace != null)
					return resultInNamespace;
				// then look for aliases:
				if (typeArguments.Count == 0) {
					if (u.ExternAliases.Contains(identifier)) {
						return ResolveExternAlias(identifier);
					}
					if (!(isInUsingDeclaration && u == currentUsingScope)) {
						foreach (var pair in u.UsingAliases) {
							if (pair.Key == identifier) {
								return pair.Value.ShallowClone();
							}
						}
					}
				}
				// finally, look in the imported namespaces:
				if (!(isInUsingDeclaration && u == currentUsingScope)) {
					IType firstResult = null;
					foreach (var importedNamespace in u.Usings) {
						ITypeDefinition def = importedNamespace.GetTypeDefinition(identifier, typeArguments.Count);
						if (def != null) {
							IType resultType;
							if (parameterizeResultType && typeArguments.Count > 0)
								resultType = new ParameterizedType(def, typeArguments);
							else
								resultType = def;
							
							if (firstResult == null || !TopLevelTypeDefinitionIsAccessible(firstResult.GetDefinition())) {
								if (TopLevelTypeDefinitionIsAccessible(resultType.GetDefinition()))
									firstResult = resultType;
							} else if (TopLevelTypeDefinitionIsAccessible(def)) {
								return new AmbiguousTypeResolveResult(firstResult);
							}
						}
					}
					if (firstResult != null)
						return new TypeResolveResult(firstResult);
				}
				// if we didn't find anything: repeat lookup with parent namespace
			}
			return null;
		}