Problem using Select Case with nested loops using vb.net
I am working on a project that requires some looping predetermined number of times. Within the For Next Loop I am trying to use Select Case to read string values until a certain condition is met. Below is my code and hopefully an understandable description of what my problem is:
To simply the example I will explain what happens within the do while loop...... A text file is broken down line by line and then each line is broken into “segments” using the split function. Using Select Case I am reading the first “Segment” of line to determine if a specific value is contained in the “segment”
xx = 10 Value of xx is determine earlier in the code
For k = 1 To xx
xDone = False
Do While xDone = False
Select Case xSeg(0)
Case Is = “ABC”
‘Then do something and continue on
Case Is = “DEF”
‘Then do something and continue on
Case is = “XYZ”
xDone = ‘True’ Indicate condition was met
'Condition met...move on
End Select
Code --- > ‘If xDone is still false then move to next line of data and break into segments and start process again,
Loop
When the ‘xDone’ condition has been met and xDone = True the Do While Loop should exit back into the for next loop at the .
Next k
The problem I am having is that this process should run ten times as indicated in the for (For k = 1 To xx ) next but it only will run a maximum of three times. Sometimes the data that is being process requires that the For Next should only loop once or twice or sometimes more but it will only loop a maximum of three times.
It has something to do with the Select Case because if I remove that whole section of the code everything works fine.
Im not a vb.net expert and I cant figure it out on my own. Any help would be appreciated.
To simply the example I will explain what happens within the do while loop...... A text file is broken down line by line and then each line is broken into “segments” using the split function. Using Select Case I am reading the first “Segment” of line to determine if a specific value is contained in the “segment”
xx = 10 Value of xx is determine earlier in the code
For k = 1 To xx
xDone = False
Do While xDone = False
Select Case xSeg(0)
Case Is = “ABC”
‘Then do something and continue on
Case Is = “DEF”
‘Then do something and continue on
Case is = “XYZ”
xDone = ‘True’ Indicate condition was met
'Condition met...move on
End Select
Code --- > ‘If xDone is still false then move to next line of data and break into segments and start process again,
Loop
When the ‘xDone’ condition has been met and xDone = True the Do While Loop should exit back into the for next loop at the .
Next k
The problem I am having is that this process should run ten times as indicated in the for (For k = 1 To xx ) next but it only will run a maximum of three times. Sometimes the data that is being process requires that the For Next should only loop once or twice or sometimes more but it will only loop a maximum of three times.
It has something to do with the Select Case because if I remove that whole section of the code everything works fine.
Im not a vb.net expert and I cant figure it out on my own. Any help would be appreciated.
ASKER
The value of K is being modified as it should and gets to three and that's when for next look gets exited. It should go to 10
ASKER CERTIFIED SOLUTION
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The value of K is being modified by what, the for next will modify (increment it anyway). As James has said there are better tools to exit a loop than by modifying the loop counter within the loop.
What is the code that is modifying the value of k?
What is the code that is modifying the value of k?
You could put a debug line at the top and bottom of the for loop to print the current value of k
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this will tell you if the value is being modified during the execution of the loop