It is possible to have two (2) group within instruction FOR EACH (xxxx) As type IN GROUP1 AND GROUP2?

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Hi everybody,
I want to know it is possible to have two group in the same instruction FOR EACH; For exemple:

For each [type] as Items in Group1 AndAlso Group2

[Loop]

Next

How i can do that?
I don't want to use two times the instruction FOR EACH.

Somebody can give any idea?
Thanks

Posted 17-Sep-13 22:56pm

alonetmr

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OriginalGriff · Accepted Answer · 2013-09-17T23:01:00

Solution 1

Assuming Group1 and Group2 contain the same type elements, then the Linq method Union would do it:
http://msdn.microsoft.com/en-us/library/bb341731.aspx?cs-save-lang=1&cs-lang=vb#code-snippet-2[^]

VB

For Each [type] as Items in Group1.Union(Group2)

Posted 17-Sep-13 23:01pm

OriginalGriff

Comments

alonetmr 18-Sep-13 5:47am

Ok, thanks for you answer but, when i use your méthode, how i can recover the data in Group2?

OriginalGriff 18-Sep-13 5:59am

Look at the link: the Union combines the two Groups to form a new group - so the loop works on both.

alonetmr 18-Sep-13 8:30am

yeah, i undestard that point. But, i want to know how i can take the data of Group2 in the new group?
The new group has all data information of both groups 1 and 2. So, what is the property who gives tha acces to the data in Group2.

OriginalGriff 18-Sep-13 9:41am

You can't. Either you have two loops, or you combine the groups to make a single loop - .NET objects do not have a "parent" property which tells you which group it is part of (unless you add one to your class yourself). And what if it is in both groups? Which one is the "parent" then?

What are you trying to do that you think you need this?

alonetmr 18-Sep-13 10:10am

Thanks for yours answer.
I have two variable (recorddata1 and recorddata2) which each one has many data. Now, this variables are in the same Namespace (same group). I have one restraint, it is forbiden to make two loop for take information of each variable.
In another word i have to take the data stored in each variable. you have another idea to do that?
After i need to put this information in a ListView.
thanks

OriginalGriff 18-Sep-13 10:58am

Then use a normal "For...Next" loop for the total number of items in the two collections and use a flag (or the number of items in the first group) to decide which group to access.