public BaseQbservable(BaseQbservableProvider provider, Expression expression)
{
if (expression == null)
{
throw new ArgumentNullException(nameof(expression));
}
if (!typeof(IQbservable <T>).IsAssignableFrom(expression.Type))
{
throw new ArgumentOutOfRangeException(nameof(expression));
}
Provider = provider ?? throw new ArgumentNullException(nameof(provider));
Expression = expression;
}
public BaseQbservable()
{
Provider = new BaseQbservableProvider();
Expression = Expression.Constant(this);
}