I have to get the balance from the web server. Once that is done it will call back into my main app with the result.However, sometime the web server fails for some unknown reason. Could be high volume of traffic or something else. However, I haven't implemented any exception handling in my class. As the app that uses this handles the exception. However, the client has confirmed that when the web server does fail it displays a unhandled exception dialog box. Then they have to click continue to keep using my application. So below I am not sure if I should implement the exception handling in my class.[code]
I have the following code in a class of mine. The purpose of this class is to get the balance from a web server. Just in case something goes wrong with getting the balance. I will handle a exception. However, all this is easy to do. But I am left wondering what do I return in my catch statement.
Most of the examples I looked at just write to the console using:
Console.WriteLine(ex.Message);
That is all very well. But in a real application what do most developers do?
My function at the moment returns void. And I am just wondering what else I would return if the webclient is busy?
I have an unhandled exception event in the ApplicationEvents area of my program, but it never gets called when I do get unhandled exceptions. Is there a trick to making this work?
I'm completely confused about the event handling. I read some articles about it but after it I just get confused to write and use them in my classes.This is my class i. e.:
[Code]..
I dont have any argument passing. But I want to know how should I do it too. And I wanted to know if each instance of the Test class, run this event separately I mean each instance by themselves, This event AnEvent() will occur? Cuz I have lots of instances from my class.
How can I structure my classes so that the user interfaces though a single class while the supporting classes are hidden from their view? I think its best understood in an example:
Public Class MyInterface Public Economic as EconomicClass Public Sub New() MyBase.New()
[code].....
So you might ask why am I even separating them? It's strictly for others who will be working with this interface. I need to funnel them though a logical structure:
This way everything is already handled for them in the background and they only need to run the method they need. I don't know if I can have it both ways in VB.NET.
I've 2 projects- one containing GUI and another a DLL project containing some implementations. I'm using Classes in DLL in my GUI. All that I wanna do is when some results are manipulated in the DLL, the final output from DLL should be made available in the RichTextBox present in the GUI project. I tried the WithEvents and also Add Handler. But its not working.In the DLL, I added...
Public Event Report(ByVal info As String) RaiseEvent Report("The folder has been Copied.") In the GUI, I added... Public WithEvents Log As RTAF_DLL.CServer // RTAF_DLLis the project name. CServer is the class // in which the event has been writtenLog = New RTAF_DLL.CServer Protected Sub Log_Report(ByVal info As String) Handles Log.ReportMsgBox(info) // Even this is not getting printedMe.RichTextBox2.AppendText(info)End Sub
The problem here is I'm not sure whether or not the event is getting raised. But I set a breakpoint and found that the Event is not handled.I tried including Imports System.Runtime.InteropServicesBut its not working.
I'm working in VB.Net developing data logging software. I've developed classes implementing a common interface that works with many of the data loggers my company produces. These classes handle the low-level hardware interfacing and expose common methods for accessing the data logger's records.
I have a general question regarding best practices for exception handling. I have a class library that uses structured error handling. The functions in the library generally perform some mathematical calculations and all return a boolean value indicating whether an exception occured or not (i.e. exception occured = true, no exception = false). The actual calculated result in the function is returned as a ByRef parameter.
Anyway the input variables for my calculations are all passed to the funtions as parameters. I perform some basic checks on these inputs (e.g check that an input is not negative etc) as part of the function code. The next stage is where im unsure of the best way to do things. Using the example i just mentioned, if an input parameter is negative, I can either throw an exception such as "ArgumentOutofRange", or i can simply show a messagebox with some info about what happened. Either way i do it the function will return true. At the moment i am throwing an exception, but on reading the "Best practices for exception handling" it is recommended you dont throw an exception for things that can be checked programatically because of "performance/overhead issues".
I'm a little confused by what they mean by this. What kind of overhead are they talking about? Slower program? More disk space required? More memory required? When my functions return true, the calling methods basically drop everything and stop calculations (exit sub), so im not sure that the overhead issues they are talking about are as important to me. It seems easier and neater to throw an exception and utilize some global error strings and pass some parameters rather than copy and paste messagebox.show() all the time, and modify the text to suit the situation. Another argument for me would be that both methods of exception handling utilize a messagebox, which stops code execution until the user does something. So i cant see the issue with the performance overhead.
for the program I am creating I want the computer to check if the configuration file has been created or not. I wrote this function to do that but I don't how to handle a file exception. Here's my code currently but obviously it returns an error if the configuration file doesn't already exist. So how do I add a check for an exception?
Public Function CheckIfRunBefore() Dim ConfDirectory As String ConfDirectory = "" Dim StreamReader As New IO.StreamReader("C:\VRAI\Conf.txt")
I am currently working on my Final Project and I need to incorporate some Exception Handling. I have created one in the following code but it isn't working. I don't have any "Errors" or "Warnings" but when I run the program it says the "BadNameException was unhandled." I thought I followed the steps correctly from my book, but I am stuck somewhere. [code]
I initially posted this in the wrong forum. I need help getting this to run properly. I'm trying to construct a fractions calculator. In order to complete it, I need to do it like this:Using Select Case statements, four Function procedures should be called based on the operation selected. Each Function procedure will calculate the correct operation and return the Decimal value to the calling procedure. The original procedure will print the result.
Now, the result should be calculated to the hundreths place and the input values should be validated by a Try-Catch Block.And of course, I've been having trouble with how to do this. I've attempted many times and this is what I have so far:
I have been using VB6.0 to create database-driven Apps. With VB6.0, I could Dimi recordsets to read/write data from/into database tables. I could use the read data to validate textbox controls on the Windows Forms. But I when I upgraded VB6.0 Apps to VS 2008, I had problems with PowerPacks not found, Exceptional Errors etc.Most of all the problems I have experienced are:
- Overload Resolution failed because no accessible 'item' accepts this number of arguments. - Error Code -2146825023 - Exception Snapshot - {"Item cannot be found in the collection corresponding to the requested name or ordinal."} - Interop Errors[code]
Currently to check if a file is in use (before attempting to move or send it by FTP etc) we try and open it with exclusive right and trap the System.IO.IOException that would occur if anotehr process is reading or writing the file.
However - how can we do this without the bad paractice of using an exception handler for unexceptional process flow?
Good, detailed resources or books for best-practices on exception handling? I am looking to dive into a much deeper understanding of it, and am finding it hard. All the books I see over .NET, ASP.NET, etc. place little emphasis or detail on exception handling.
I am currently testing out a 3-tier ASP.NET application, with a presentation layer, business logic layer, and data layer, and want to know more about exactly when to throw errors, when to catch them, what layer to do them in, etc.
I don't want a simple google search on ".NET exception handling" and then having you post the first couple of links. I would like you to respond if you have quality, known resources that you have used or have found.
Dim sItem As String = "$/MyVssProject/InexistentFile.txt" Dim oItem As SourceSafeTypeLib.VSSItem = Nothing Try
[Code]....
The problem I face is when I try to get an instance to a file that doesn't exist in the VSSDB, thus leading to a COMException, which basically wouldn't be of a problem (I would expect). In fact the exception occurs, but instead of proceeding with the catch code, the debug cursor stays on the line "oItem = m_oSourceSafe.VSSItem(sItem)", showing a dialog with title "COMException crossed a native/managed boundary.
From here the execution doesn't proceed, until I change the content of sItem to an existing file.
Why does the exception not get caught, and how can I achieve it?
Environment: VS2010 with .Net 2.0 on WinXP SP3 x86
Im using (virtually) the same code in two different projects, in the first, much older, program the code works well and had done for years. In the second the same code produces and Exception error.
QuoteUnauthorizedAccessException was unhanded.
Access to the path ˜C:/Jotto 1.gtc is denied.
Troubleshooting tips:
Make sure you have sufficient privileges to access this resource. If you are attempting to access a file, make sure it is not ReadOnly.
Actions:
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The detail copied to clipboard says: -
CODE:
Which sadly means very little to me and I cant make head nor tail of what the Help, says... The only difference between the two codes is that in the first, working, project the file I wish to delete is named specifically whereas in the second, its named as a variable.
CODE:
The code runs ok up to the second of these lines, so the filepath has been verified. Have I perhaps missed something earlier in the code? some preconditioning perhaps ?
How do i go about creating an exception handler when i want to login to my form to access the rest of my forms. The username and password are linked to server.What if it doesnt connect to server? here is coding for me to login:
Private Sub btnLogin_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnLogin.Click If (txtUName.Text = "-") Or (txtUName.Text = "0") Or (txtUName.Text = "") Or
I have written a MDI Text Editor and I have written sub routines for print preview, cut, copy and so on, when testing my program, I click print preview when there are no documents active and the program crashes, the same happens with cut, copy, paste.
I know this is because I have not handled any error exceptions, the truth is im not sure how to.
I have got the code that makes print preview work with my mdi documents, but what code can I use or how can I add it to my existing sub routines to possibly show a message box saying something like "This Function Cannot Be Used With No Active Documents" something like that.
Could I use an If Statement? or Try, Catch, Block? - I am using a different computer as I am currently at work but if anyone needs the code I currently have for my sub routines.
I'm working on a project for school in which a dll is loaded.
The dll that is loaded is a bridge between my program and the Twincat System Manager which forms the bridge between the computer and a PLC via the local network.
I need to read Variables trough this whole chain from the plc to my program.
This is the way I do this:
Public Function adsReadReal(ByVal Variabelenaam As String) As Single Dim ds = New TwinCAT.Ads.AdsStream(4 * 8) ' new data stream Dim br = New System.IO.BinaryReader(ds) 'new binary
We generally have main block to start the program or application first form.I wrote some code in main and it is within try can catch block.Catch block the errors. This try catch block is a global try catch for my whole application.Now if exception occur in the code will be handled in this catch. But Is there any good way to handle the exception in the catch block if occur?as I write error in log file but sometimes file can have permissions for writing etc and it can create exception.As this try catch is the outer most try catch block and if any error occur in that catch it will cause application to crash.
I already read a lot about exception handling and saw many different threads on the subject but still confused when creating class libraries like the following scenario.
Lets say i have a class library "MyClass.dll", inside the project i have two classes:
Skeleton.vb Imports System.IO Public Class Skeleton Public Function Create(ByVal resourceName As String) As String
I'm writing a CPU emulator in VB .NET.It's important to keep the code tight for maximum performance.
The following test code shows an example of my issue[code]...
Now I know I can use a long, and mask the value with &HFFFF, and I know I can add exception handling to the code. but remember, this is an emulator and more code = less performance.
