updating Order list on realtime

[stewarco]

Hello. I have a List containing various stop orders. I'm trying to set it up so that if a strategy shuts down and then restarts all those orders are changed from historical to realtime. In the State = State.Realtime, I have written:

foreach (Order o in StopList)
stopList(o) = GetRealtimeOrder(o)

but the compiler doesn't like that. I feel like this should be straightforward but clearly I don't understand either how Lists work or how the GetRealtimeOrder works. Can you help me?

Thanks

[NinjaTrader_ChrisL]

Hello stewarco,

Thanks for the note.

When you use a foreach loop, you do not need to reference the list again in the loop body, it will iterate each value in the List object. I do not have the full context here, but you can do this to make it work:

foreach (Order o in StopList)
o = GetRealtimeOrder(o)

Here is a publicly available link that includes some examples of using foreach:

https://www.dotnetperls.com/foreach

Please let me know if I can assist further.

[stewarco]

follow up

thanks. I'll review the link you provided, and I had tried the language you suggested, but I get the Error message "Cannot assign to 'o' because it is a 'foreach iteration variable'. any idea what's going on there?

[NinjaTrader_ChrisL]

Hello stewarco,

Thanks for the reply.

Sorry I did not catch that. You can not mutate the actual iteration object while doing a foreach. You will either have to use a regular for loop like so:

for(int i = 0; i < myList.Count; ++i)
			{
				Print(myList[i]);
			}

Or you can use the List class IndexOf method to get the index from the object being iterated.

https://msdn.microsoft.com/en-us/lib...v=vs.110).aspx - IndexOf

There are also other solutions, like this change method described in this post:

https://stackoverflow.com/questions/17676974/changing-objects-value-in-foreach-loop

Please let me know if I can assist further.

[stewarco]

ok thanks i'll try those