public static IPackage FindPackage(this IPackageRepository repository, string packageId, SemanticVersion version, IPackageConstraintProvider constraintProvider, bool allowPrereleaseVersions, bool allowUnlisted)
{
if (repository == null)
{
throw new ArgumentNullException("repository");
}
if (packageId == null)
{
throw new ArgumentNullException("packageId");
}
if (version != null)
{
allowUnlisted = true;
}
else if (!allowUnlisted && ((constraintProvider == null) || ReferenceEquals(constraintProvider, NullConstraintProvider.Instance)))
{
IPackage package;
ILatestPackageLookup lookup2 = repository as ILatestPackageLookup;
if ((lookup2 != null) && lookup2.TryFindLatestPackageById(packageId, allowPrereleaseVersions, out package))
{
return(package);
}
}
IPackageLookup lookup = repository as IPackageLookup;
if ((lookup != null) && (version != null))
{
return(lookup.FindPackage(packageId, version));
}
IEnumerable <IPackage> packages = from p in repository.FindPackagesById(packageId).ToList <IPackage>()
orderby p.Version descending
select p;
if (!allowUnlisted)
{
packages = Enumerable.Where <IPackage>(packages, new Func <IPackage, bool>(PackageExtensions.IsListed));
}
if (version != null)
{
packages = from p in packages
where p.Version == version
select p;
}
else if (constraintProvider != null)
{
packages = DependencyResolveUtility.FilterPackagesByConstraints(constraintProvider, packages, packageId, allowPrereleaseVersions);
}
return(packages.FirstOrDefault <IPackage>());
}
/// <summary>
/// Finds a package in the wrapped <see cref="IPackageRegistry"/> or <see cref="IPackageLookup"/>.
/// As this is used to "fake" the existence of certain packages, the resulting package can be of type <see cref="NullPackage"/>.
/// </summary>
/// <returns>A valid <see cref="IPackage"/> if found; null, otherwise.</returns>
public IPackage FindPackage(string packageId, SemanticVersion version)
{
var package = _packageRegistry.FindPackage(packageId, version);
return(package ?? _packageLookup.FindPackage(packageId, version));
}
