public IEnumerable <RuntimePackageDependency> FindRuntimeDependencies(string runtimeName, string packageId)
{
if (_packagesWithDependencies == null)
{
// Find all packages that have runtime dependencies and cache this index.
_packagesWithDependencies = new HashSet <string>(
Runtimes.SelectMany(e => e.Value.RuntimeDependencySets.Select(f => f.Key)),
StringComparer.OrdinalIgnoreCase);
}
if (_packagesWithDependencies.Contains(packageId))
{
var key = new RuntimeDependencyKey(runtimeName, packageId);
return(_dependencyCache.GetOrAdd(key, k => FindRuntimeDependenciesInternal(k)));
}
return(Enumerable.Empty <RuntimePackageDependency>());
}
