Jimbo99999
asked on
VB.Net - DataTable Row Reference
Good Day Experts!
I have a little project that I am working on - VB6 to VB.Net conversion. The original VB6 code uses a recordset to loop through the records. Within the loop, the code checks for EOF. If EOF, then the code backs up one record to get data.
So, now I am trying to figure out how to make that happen in .Net.
1) Is there a way at the bottom of my For DataTable loop to check if the current row of
the DataTable is the last one?
2) Then, if it is the last row of the DataTable, back up a row in the DataTable so I can
reference that row data to run a Select query?
Thanks for the help,
jimbo99999
I have a little project that I am working on - VB6 to VB.Net conversion. The original VB6 code uses a recordset to loop through the records. Within the loop, the code checks for EOF. If EOF, then the code backs up one record to get data.
So, now I am trying to figure out how to make that happen in .Net.
1) Is there a way at the bottom of my For DataTable loop to check if the current row of
the DataTable is the last one?
2) Then, if it is the last row of the DataTable, back up a row in the DataTable so I can
reference that row data to run a Select query?
Thanks for the help,
jimbo99999
if you use a "For Each x as DataRow in YourDataTable.Rows"instead of a regular For, you don't need to check for EOF
ASKER
But I need to check for it so I can do 2).
then you can create your own counter and check if it equals YourDataTable.Rows.Count()
ASKER
Thanks
This is where I am at so far with referencing the DataTable items based on row Position in the DataTable.
sqlRStbl.Rows(sqlRStbl_row Position)( "DIRECTION ").Value
Do I need a .Value or .toString after the Item reference? If so, how do I know which one to use when?
Thanks,
jimbo99999
This is where I am at so far with referencing the DataTable items based on row Position in the DataTable.
sqlRStbl.Rows(sqlRStbl_row
Do I need a .Value or .toString after the Item reference? If so, how do I know which one to use when?
Thanks,
jimbo99999
>>Do I need a .Value or .toString after the Item reference? If so, how do I know which one to use when?
Very often you don't need because there are some default properties but I personally prefer to always write them.
Very often you don't need because there are some default properties but I personally prefer to always write them.
ASKER
Ok, thanks.
One more item and I think I will have enough knowledge to give this a shot here.
Normally when I iterate through a DataTable I use the following:
For Each sqlRSProcessing In sqlRStbl.Rows
Direction = sqlRSProcessing("DIRECTION ").Value
Next
In order to be able to reference previous rows in the DataTable, Is this what I will have to use to loop through the DataTable and reference the values in a row?
Do While sqlRStbl_rowPosition < (sqlRStbl.Row.Count - 1)
Direction = sqlRStbl.Rows(sqlRStbl_row Position)( "DIRECTION ").Value
Loop
Thanks,
jimbo99999
One more item and I think I will have enough knowledge to give this a shot here.
Normally when I iterate through a DataTable I use the following:
For Each sqlRSProcessing In sqlRStbl.Rows
Direction = sqlRSProcessing("DIRECTION
Next
In order to be able to reference previous rows in the DataTable, Is this what I will have to use to loop through the DataTable and reference the values in a row?
Do While sqlRStbl_rowPosition < (sqlRStbl.Row.Count - 1)
Direction = sqlRStbl.Rows(sqlRStbl_row
Loop
Thanks,
jimbo99999
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ASKER
Trying to "mimic" the VB6 behavior is harder than I thought...thanks for the patience.
Ok, I just found out that the original VB6 code was moving previous at the EOF to get the last records data...I am not a VB6 coder and did not realize that VB6 EOF puts you past the end of the data. So, I htink I am good there.
When inside the VB6 Do Until sqlRS.EOF = True loop, several references are made to sqlRS.MoveNext based on code conditions. To do that I am envisioning having to increment my RowPosition. So, thinking out loud, then the next time I hit the end of the Loop my Rowposition will then increment again(which is what I want).
Thanks,
jimbo99999
Ok, I just found out that the original VB6 code was moving previous at the EOF to get the last records data...I am not a VB6 coder and did not realize that VB6 EOF puts you past the end of the data. So, I htink I am good there.
When inside the VB6 Do Until sqlRS.EOF = True loop, several references are made to sqlRS.MoveNext based on code conditions. To do that I am envisioning having to increment my RowPosition. So, thinking out loud, then the next time I hit the end of the Loop my Rowposition will then increment again(which is what I want).
Thanks,
jimbo99999
ASKER
Thanks for the dialogue. I am all set now.