lock (Account.All)

[Dan_D_Trader]

Hello.
I am trying to understand the purpose of the lock statement in the example under the NinjaScript Language Reference "Account" just underneath "// Find our Sim101 account."

Thank you.

Dan.

[NinjaTrader_ChelseaB]

Hello Dan,

The lock() method is to prevent an object (in this case a collection of all accounts) from being accessed as it is being modified.

More specifically:
"The lock keyword ensures that one thread does not enter a critical section of code while another thread is in the critical section. If another thread tries to enter a locked code, it will wait, block, until the object is released."

In this case, this is to prevent a 'Collection was modified after the enumerator was instantiated' error.

Below is a link to a forum post that discusses.
https://ninjatrader.com/support/foru...06#post1099406

Below is a link to the Microsoft documentation and to links to educational sites.
https://docs.microsoft.com/en-us/dot...lock-statement
https://stackoverflow.com/questions/...k-work-exactly
https://stackoverflow.com/questions/...90569#23090569