/// <summary>
/// Return the current Context, ensuring that an object is the same as a Context property.
/// </summary>
/// <typeparam name="T">Context type</typeparam>
/// <param name="role">Object playing a role in an extension method</param>
/// <param name="contextRole">Context property that should be the same as the object</param>
/// <returns>Context in initialized scope</returns>
/// <exception cref="InvalidOperationException">If the object isn't equal to the specified Context property.</exception>
public static T Current <T>(object role, Func <T, object> contextRole) where T : class
{
return(CurrentContext.Current(role, contextRole));
}