Please note that this code does?

[julifro]

Please can someone explain to me that means in this code == null and .locked and makes this piece of code ?. Thank you



if ( ((DrawObjects["UpTrendRay"] ==null) || (DrawObjects["UpTrendRay"].Locked)) && ((DrawObjects["DownTrendRay"] ==null) ||(DrawObjects["DownTrendRay"].Locked)))

[sledge]

So .Locked explained

http://ninjatrader.com/support/forum/showthread.php?t=73691&highlight=DrawObjects+Locked

So if you don't have an UpTrendRay or you have one and it is Locked... And same with DownTrendRay, do something...

[NinjaTrader_PatrickH]

Hello julifro,

Thank you for your post.

sledge is correct here.

[julifro]

thanks for the reply.
However someone can clarify that puts == null.
In the help of the method it appears! = Null and this indicator appears == null. You can be modified in this way a method?

[sledge]

Sorry, I'm not understanding what you are asking...

NULL means nothing. So == null is a check for nothing.

[julifro]

I have not planted correctly the question.
the method used in the indicator'm studying is this

if (DrawObjects["someTag"] != null && DrawObjects["someTag"].DrawType == DrawType.Line

however the indicator used == null.

if ( ((DrawObjects["UpTrendRay"] ==null) || (DrawObjects["UpTrendRay"].Locked)) && ((DrawObjects["DownTrendRay"] ==null) ||(DrawObjects["DownTrendRay"].Locked)))

I do not understand because it uses == null



thanks and sorry for my English

[NinjaTrader_PatrickH]

Hello julifro,

Thank you for your response.

The condition is looking to see if the Up or Down Trend Ray is null or if it is locked. The '||' operator is or.

So the condition as...

[B]if [/B]( ((DrawObjects["UpTrendRay"] ==null) [B]||[/B] (DrawObjects["UpTrendRay"].Locked)) [B]&&[/B] ((DrawObjects["DownTrendRay"] ==null) [B]||[/B](DrawObjects["DownTrendRay"].Locked)))

..can be written as the following:

If UpTrendRay is not found or it is locked and DownTrendRay is not found or it is locked.

[NinjaTrader_Matthew]

The DrawObjects collection implements an indexer, which allows items in the collection to be looked up by the drawing tools "Tag" using array notation []

https://msdn.microsoft.com/en-us/library/2549tw02.aspx

If it cannot find an element in the collection that matches that string name "Tag", the expression will return null.

Basically, that code is saying

"Check if the draw objects collection does not have a drawing tool with the tag "UpTrendRay" (i.e., the referenced tag does not exist in the collection)"