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adding rows from one datatable to another

The following code :
For Each r As DataRow In dtFlow.Rows
Dim arow As DataRow = dtAllFlows.NewR ow
arow = r
dtAllFlows.Rows .Add(arow)

leads to the error 'This row already belongs to another table '
at the line dtAllFlows.Rows .Add(arow).
I guess I should just do dtAllFlows = dtFlow.copy, but I can't as the
code above is contained in a For loop and at each iteration, I add new
rows (dtFlow changes at each iteration).

How can I solve this problem ?


Nov 21 '05 #1
21 22743

I assume that this is what you want to do


I hope this helps,

Nov 21 '05 #2
Thanks Cor ;-)

Nov 21 '05 #3
Actually, I might have spoken too quickly.

For Each r As DataRow In dtFlow.Rows
Dim arow As DataRow = dtAllFlows.NewR ow
arow = r
dtAllFlows.Impo rtRow(arow)

It looked right but in fact when I try to access the data:

dtallflows.Rows (0).Item(0)

gives :

Run-time exception thrown : System.IndexOut OfRangeExceptio n - Cannot
find column 0.

What's going on ?

Nov 21 '05 #4

When you try to copy a complete table, than you can use table.copy

However this is a sample from me how to sort a datatable, you see than the
use of the import in it.

Dim dv As New DataView(dt)
dv.Sort = "bla"
Dim dtnew As DataTable = dt.Clone
For Each dvr As DataRowView In dv
dtnew.ImportRow (dvr.Row)

I hope this helps,

Nov 21 '05 #5
As I said in the first thread, I don't want to do a copy as I add the
rows in a for loop (concatenate if you prefer). therefore I have to use
ImportRow, which leads to the error mentionned in my second thread...
Can you help further ?


Nov 21 '05 #6

The only thing you can do is copy it, use an extra dataview, remove it from
the first.

However you cannot have a reference in one datarow to two tables.

There is this property in the datarow that should explain that to you if my
text did not.


It is a litte bit difficult to set one address to two tables.

I hope this helps,

Nov 21 '05 #7
Ok, I do that now :

Dim dvTmp As new DataView
dvTmp.Table = dtFlow
dtFlow = Nothing
For Each r As DataRowView In dvTmp
dtAllFlows.Rows .Add(DirectCast (r, DataRow))

But the Add line doesn't work ( invalid cast ). How can I add a
datarowview to a datatable ??


Nov 21 '05 #8
This should be correct I guess...

dtAllFlows.Rows .Add(r.Row)

But I keep getting the error ; the datarow already exists in another
table :(
How come ??

Nov 21 '05 #9

Did you read my message?

How you want to do this

myproperty a = adress of datatable wherein it is connected
datarow.a = table1
datarow.a = both table1 and table2

Nov 21 '05 #10

This thread has been closed and replies have been disabled. Please start a new discussion.

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