/// <summary>
/// Tests whether <paramref name="provider"/> has feature <typeparamref name="TFeature"/>.
/// </summary>
/// <typeparam name="TFeature">A type of required feature.</typeparam>
/// <param name="condition">An ensure condition helper.</param>
/// <param name="provider">A provider to test feature on.</param>
/// <exception cref="ArgumentOutOfRangeException">When <paramref name="provider"/> doesn't have feature of type <typeparamref name="TFeature"/>.</exception>
public static void HasFeature <TFeature>(this EnsureConditionHelper condition, IFeatureProvider provider)
{
Ensure.NotNull(condition, "condition");
Ensure.NotNull(provider, "model");
TFeature feature;
if (!provider.TryWith(out feature))
{
throw Ensure.Exception.ArgumentOutOfRange("model", "Feature of type '{0}' is required on '{1}'.", typeof(TFeature).FullName, provider);
}
}
/// <summary>
/// Tries to retrieve object of type <typeparamref name="TFeature"/>.
/// If this is not possible, throws <see cref="NotSupportedException"/>/
/// </summary>
/// <typeparam name="TFeature">A type of the feature to retrieve.</typeparam>
/// <param name="provider">A feature provider.</param>
/// <returns>Feature of type <typeparamref name="TFeature"/>.</returns>
/// <exception cref="NotSupportedException">If <paramref name="provider"/> doesn't support feature of type <typeparamref name="TFeature"/>.</exception>
public static TFeature With <TFeature>(this IFeatureProvider provider)
{
Ensure.NotNull(provider, "model");
TFeature feature;
if (provider.TryWith(out feature))
{
return(feature);
}
throw Ensure.Exception.NotSupported(
"Feature provider '{0}' doesn't support feature '{1}'.",
provider.GetType().FullName,
typeof(TFeature).FullName
);
}
