/// <summary>Returns the instance value as a <typeparamref name="V"/>, if supported, or <c>null</c>.</summary>
/// <typeparam name="V">The target type.</typeparam>
/// <param name="instance">An <see cref="IValueProvider"/> instance.</param>
/// <returns>A value of type <typeparamref name="V"/>.</returns>
public static V GetValueAs <V>(this IValueProvider instance) where V : class
{
return(instance.GetValueOrDefault <object>(null) as V);
}
/// <summary>Returns the instance value cast to <typeparamref name="V"/>.</summary>
/// <typeparam name="V">The target type.</typeparam>
/// <param name="instance">An <see cref="IValueProvider"/> instance.</param>
/// <returns>A value of type <typeparamref name="V"/>.</returns>
/// <exception cref="InvalidCastException">The specified cast is invalid.</exception>
public static V CastValue <V>(this IValueProvider instance) where V : class
{
return((V)instance.GetValueOrDefault <object>(null));
}
/// <summary>
/// Retrieves a value of type <typeparamref name="V"/>, if supported by the instance, or <c>default(V)</c> otherwise.
/// </summary>
/// <typeparam name="V">The value type.</typeparam>
/// <param name="instance">An <see cref="IValueProvider"/> instance.</param>
/// <returns>A value of type <typeparamref name="V"/>.</returns>
public static V GetValue <V>(this IValueProvider instance)
{
return(instance.GetValueOrDefault(default(V)));
}