/// <summary> /// Tests whether a feature appears in these features. /// This never throws. /// </summary> /// <param name="this">This enumerable of features.</param> /// <param name="f">The expected feature.</param> /// <returns>True if the feature exists in these features.</returns> public static bool Has(this IEnumerable <VFeature> @this, VFeature f) => @this.Contains(f);
/// <summary>
/// Tests whether a feature appears with a maximal version in these features.
/// This never throws.
/// </summary>
/// <param name="this">This enumerable of features.</param>
/// <param name="f">The expected feature.</param>
/// <returns>True if the feature exists in these features with the expected version or a lower one.</returns>
public static bool HasAtMost(this IEnumerable <VFeature> @this, VFeature f)
{
return(@this.Any(x => x.Name == f.Name && x.Version <= f.Version));
}
/// <summary>
/// Tests whether a feature name (or a versioned "Name/SVersion") appears in these features.
/// This never throws.
/// </summary>
/// <param name="this">This enumerable of features.</param>
/// <param name="featureName">The name or the "Name/SVersion".</param>
/// <returns>True if the feature name or versioned name exists in these features.</returns>
public static bool Has(this IEnumerable <VFeature> @this, string featureName)
{
var f = VFeature.TryParse(featureName);
return(f.IsValid ? @this.Contains(f) : @this.Any(x => x.Name == featureName));
}