Select Case String Analysis + Threading = Failure?
May 27, 2010
I'm writing a threaded multi-client chat application in VB.NET(2008). While the thread is running and a message is received from the server(in this particular case: "ping") i wish to copy the content of the variable holding the newly received data to another variable(as that first variable is constantly changing) and then later call the Checkmsg() sub which contains a select case to analyse the string and notice a particular command(in this case, when it notices "ping" as received data, I want it to send "pong" back to the server.) and react to it. Now the problem is the code actually "jumps" to the Checkmsg() sub, and fails to compare properly the received data to my select case argument. I've tried setting messageboxes at a couple of place to see if my data was somehow changed but even before the line that compares the two strings the message box prints "ping" and the select case is set to react to "ping" but it wont "move". Now I don't really understand, i've done much vb programming but i'm learning threads.
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Feb 10, 2010
I have 8 sentences, such as:
"Hello and we Hope you enjoy our service<100>"
"Good Morning Mr something nice to see you <200>"
"Good Evening Welcome to this domain <300>" etc etc
(The actual requirement is long sentence about 10 or 15 word and 8 different sentences.) I want to check which on is the response from the xmlhttp, I am doing that by searching the response if it contain <100> or <200> or <300> and depends on that I want to display "Login Faild", "Login success", "Server Down" etc.. what I mean, I have a place for 4 words in my listview and i don't want to put the complete response that came from the server, my question is, how to do it? I had tried to use Select Case in this way, it did not worked.
Select Case MyResponse
Case MyResponse.Contain("<100>")
MyResult = "Login Failed"
[code]....
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Apr 15, 2010
Is there anyway I can build a Select statement that uses the Contains function? Like this:
Select commentStr
Case commentStr.Contains("10")
Case commentStr.Contains("15")
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Aug 24, 2011
i have a ini file where i read my data
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Oct 19, 2009
I am trying to write a code that converts characters in string using a case select statements. For instance if I type the word "aeiou" the the word "<>[]/", also if I type "AEIOU" then <>[]/" should print but its not working here is a sample of my code so far.
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Feb 21, 2011
I have a lot of really long strings that I want to test. Is it possible to use the CASE statement and compare it to the first 25 characters of the string to get a match?
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Mar 21, 2006
When my form loads it adds some handles (using AddHandler) to a sub (showStatus). What this sub does is checks which control activated the sub (using sender.Equals) and displays text in the status label (status) accordingly.For this I use an If...Then statement for each possibility. There are many possibilities and my code get cluttered. Is there a way to do the same thing with a Select...Case statement. I tried: Select Case sender Case tbOne : status.Text = "blahblahblahblahblahblah" End Selectwhere: tbOne is a textbox, status is a StatusLabelIt gives me an error though, saying "Operator '=' is not defined for types 'Object' and 'System.Windows.Forms.TextBox'."Any ideas on how I can get this to work with a select case statement?
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Oct 20, 2009
here is my code..
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If the result is 86 and it's mod by 43 the answer is 2 Case 2 is not firing. it just goes to the end of the procedure.
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Oct 28, 2009
i have a program using a select case to convert letters to special charaters. My question is how can I get the code to read upper and lower case letters without having to put the upper case letters in my select case statement. Example: Part of my code is
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Oct 31, 2010
ive got a form containing treeview on the left docked, and two panels one over the other (just as for practice), so i am using treeview to select one from the other the code contains the Case select,
If
Not e.Node
Is
Nothing
[code]....
The problem is , both panels are not visible, when i select the first node the firstpanel is visible then i select the second node both panels are not visible, i return to the first node the first panel is visible.
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Aug 16, 2010
I'm having an odd problem with an ASP.Net page.I'm getting an object not set error message when assigning a string literal to a variable. [code] And here is the code that the error is pointing to. The last line in this fragment is the line 10 the error is complaining about [code] It seems it fails on accessing any reference type, even if it is declared locally in the load function. I originally found the problem when Request. IsSecureConnection was nulling out on me. I eventually discovered I could replace it with the above code and fail in the same way. The problem does not always happen. It seems to be triggered by publishing an update from Visual Studio, or when I head home for the day and the server sits idle all night. One or two app pool recycles seems to clear it up, and the page functions correctly. I've been doing desktop development for a few years, but I'm fairly new to web development.So maybe this is something obvious I've got configured wrong. I'm currently using .Net 4 on IIS 6. That code is in a foreach over an IEnumerable(of XElement). The stack trace still points to the string assignment, but all other stack traces are spot on, so I don't think it's a bad pdb.Also, when the error occurred this time, no amount of recycling the app pool or stopping and starting it would fix the error. I finally got it working again by switching the application to a different app pool.
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Aug 18, 2010
i m working on an application where i m using multi threading.suppose i ve below threads
Thread1
Thread2
Thread3
so i want to call a method from some specific place where every thread running concurrently
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so i m not able to identify a thread in the case "ABC"
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Oct 28, 2010
[code]I don't get any error messages, but the DoSomething() line is never executed. I guess this isn't possible.
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Jan 3, 2011
I'm working on a routine that requires a significant amount of nested and daisy-chained logic. Using If-Then-Else, each logic construct would run 8-15 lines of code (quite readable) while using Select Case each construct doubles that (even with significant commentation, it gets less and less readable with each new Case).
I've read many times in this forum how Select Case is leaps and bounds ahead of If-Then-Else in runtime performance, although I can't recall any discussion of the underlying process(es) that make it so. I've also not had any luck finding good, detailed documentation on the nuts and bolts under each logic construct. What I'm working on, if the performance leap is legit, needs the performance more than the readability but if the performance is marginal then the readability is going to get the priority. how and why Select Case is supposed to process so much faster than If-Then-Else. Links to good white paper would be really nice too.
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Jun 12, 2011
I have a macro that uses "If Then" to choose what macro to run based on the ActiveCell. I would like to use the Select Case method instead. How would I change this code?
Private Sub Workbook_SheetChange(ByVal Sh As Object, ByVal Target As Range)
Application.DisplayAlerts = False
Application.ScreenUpdating = False
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Apr 11, 2011
Question is, I basically wrote a Rock Paper Scissors game in VB.NET using If statements and wondered how exactly I would try and work this into a Select Case instead.Professor was pretty awful at teaching things and didn't let us know until today that it had to be Select Case(its due tomorrow
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Apr 3, 2012
Converting an IF THAN ELSE into a select case
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Nov 30, 2010
I am convertng vb.net to c# 2010 as my job, and none of the automatic tools I have can succeed completely. In special example, this case:
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I am mostly java developer before this, so not great with c# and none with vb.net. I do not understand the "oaaaa to" part and this part is not converting. Can you please point me to right place to find the c# version of this?
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Aug 26, 2009
I have an if-elseif-then setup as below:
Private Sub CommandButton1_Click()
If OptionButton1.Value = True Then
getdate
Unload glpmenu
[Code] .....
I would like to change to Select Case.
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Mar 24, 2011
i think this is the right place to post this.so i am doing my First Vb project and have run into some problems
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Jan 26, 2009
I am using visual basic in VS 2008 and trying to learn how to assign a value to a word in a combo box using case select, this is my first attempt at programing and i just can't work out what to do next. So far i have two combo boxes a label and a button, i want the word, first to = 11, second = 9, third =7, fourth = 5. All it is doing at the moment is adding the list index value and displaying that total in the label. I want it to display for eg: if (first=11) and (second=9) are selected a total of 20 in the label,and so on for what ever combination is selected.
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Aug 18, 2009
I have assigned nodes in my treeview keys depending on what they are to do with and now i would like to use a select case to choose the right calculation depending on which node is selected.i have tried selecting the key like this:
Select Case tvwFCOM.Nodes.IndexOfKey(tvwFCOM.SelectedNode.Text)
Case Is = "assi06"
Call MinimumSpeeds()
but option strict on dissalows conversion from string to integer. there are more cases, but i have only shown one here. How can i code so that the key is selected from the selected node?
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Jan 27, 2010
I had to change the given code from If Then to Select Case, and this is what I came up with. But when I run the program, it does not work and gives me zeroes instead of the correct information.
Public Class MovieInfo
Private wkndBox, screens As Integer
Private title As String
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Jun 3, 2011
I just replaced a different segment of code with the select case statement and it works fine. However I don't understand what the dim is for after you do "Select case [variable name here]"
I currently just dimmed a value as nothing. I didn't specify any data type for my variable I'm using for this case statement. But it works.[code]...
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Jun 16, 2009
Enum age
Over18
Under18
End enum
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'age' is a type and cannot be used as an expression.Is there any way of using enums in "select case"?
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Nov 8, 2010
I am in my programming class and we had a small program to make that would check to see if an value that was entered is a integer and convert it to a Roman numeral. I know how to properly do it by putting the TryParse into the If...Then statement. What I am trying to do is to not use an If...Then statement and go just by a Case Selection statement. If it is not possible then that is cool with me, I am just trying to think outside the box. Here is what i have done with it:
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When you do say "Case 1" it says it needs to be "Case CBool(1)." Using either "Case CBool(1)" or "Case 1 = 1" provides the same result .However the code shows no errors it doesn't do the conversion, it always displays the label's value as "I"
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May 1, 2009
I have a question regarding a null value which I am not supposed to get in VB. Here is my code.
Public Class SelectDemo
Private Sub lstData_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles lstData.SelectedIndexChanged
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Oct 18, 2009
i need to make a statement that checks the remainder of a number divided by 4.[code]can i get this in SELECT CASE ..MOD format please
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Jun 15, 2011
Select Case currentNodeName
Case "string1","string2","string3","stringEtc"
Case Else
[Code]....
The above is a code snippet... of course I've already made my declarations earlier in the code. My issue is I get the error " 'Select Case' must end with a matching 'End Select'." It looks to me like VB is not liking my If statement with the "Next For" in the middle. I'm sure this is a basic syntax issue.
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Jul 30, 2010
I have say 4 asp.net radiobuttons which are grouped, I want to find out which one is checked.
What seems natural to do is:
Select Case RadioButton.Checked = True
Case myRadioButton1
Case myRadioButton2
Case myRadioButton3
Case Else
End Select
I just get a 'reference to a non-shared member reference' error. It's a shame because it seems such a clean way to do this test.. Is it possible??
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