/// <summary>
/// Checks whether the projection references the projector's parameter.
/// </summary>
/// <param name="expression">Projector.</param>
public void Validate(Expression expression)
{
var projector = (LambdaExpression)expression;
var paramSeeker = new ParameterSeeker();
if (!paramSeeker.Exists(projector.Body, projector.Parameters[0]))
{
throw new InvalidProjectionException("The projection does not hold any reference to the projector's parameter.", projector.Body);
}
}