Custom Error Handling In Vb.net
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This article gives you a idea about exception handling in Visual Basic.Net and also how you can create your own custom exceptions. 2875 Exception Exceptions are the occurrence of some condition that changes the normal flow of execution . For example: Your program run out of memory , file does not exist in the given path , network connections are dropped etc. More specifically for better understanding , we can say it as Runtime Errors . The Concept The whole idea of having customized Exception Handling is centered around the fact that there needs to be a generic approach of catching and throwing Exceptions. For implementing custom Exception Handling we need to derive the class CustomException from the system base class https://msdn.microsoft.com/en-us/library/aa289505(v=vs.71).aspx ApplicationException. In general, for customizing Exception Handling the following components are necessary: 1. A custom exception class which would host the exception thrown and can be thrown as a new exception. 2. A message class that would host all user - friendly Application messages that need to be displayed. Creating Custom Exception VB.NET define your own custom exceptions to identify the occurrence of unexpected events in your code.exceptions are implemented in VB.Net as classes and objects. Create a exception http://www.dotnetheaven.com/article/custom-exception-handling-in-vb.net kind of class and inherit it from Exception class. Override the Message property and ToString() method. For example: Module Module1 Class NotEnoughBalanceException Inherits Exception Public Overrides ReadOnly Property Message() As String Get Return "Sorry! Not Engouh Balance" End Get End Property End Class Class Customer Private name As String Private balance As Integer Public Sub New(ByVal name As String, ByVal opamt As Integer) Me.name = name Me.balance = opamt End Sub Public Sub Deposit(ByVal amount As Integer) balance += amount End Sub Public Sub Withdraw(ByVal amount As Integer) If amount > balance Then Throw New NotEnoughBalanceException() End If balance -= amount End Sub Public Sub ShowBalance() Console.WriteLine("Balance of {0} is {1}", name, balance) End Sub End Class Class ExpTest Public Shared Sub Main() Dim c As New Customer("Amit", 5000) Try c.Deposit(4000) c.ShowBalance() c.Withdraw(20000) c.ShowBalance() Catch ex As NotEnoughBalanceException Console.WriteLine(ex.Message) End Try End Sub End Class End Module OUTPUT: Conclusion: Hope this article would have helped you in understanding custom exception handling in VB.NET. Related Articles How to Exception Handling in VB.NET Exception Handling using VB.NET Enumeration and Exception Handling in Visual Basic .NET Use of Exception Handling in VB.NET Exception Ha
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and http://stackoverflow.com/questions/9279217/handling-custom-exceptions-in-vb-net-console-applications policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags http://www.c-sharpcorner.com/uploadfile/akukreja/custom-error-handling-in-vb-net/ Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only custom error takes a minute: Sign up Handling custom exceptions in VB.net console applications up vote 1 down vote favorite I'm working on an application I inherited which has a lot of overly broad exceptions built in, it uses try/catch blocks but completely ignores the exception (in most cases) and steps over. I'd like to wrap in a better custom exception model, but custom error handling my custom exception itself keeps coming back unhandled. How would I go about throwing an exception that I can log, and marking the exception as handled to continue execution? In the example, I am getting into the finally block, and am getting into ExpectedExeptionType. It's still, however, throwing an unhandled exception which stops the thread execution with the pop-up box. Is there a way for me to throw the exception, use it to log the message, and continue processing (count my exception as handling it)? Example: Module Module1 Sub Main() Dim a As Integer Console.WriteLine("Please enter an integer and then press enter.") Try a = Console.ReadLine() Console.WriteLine("You entered the value " & a.ToString) Console.WriteLine("Press enter to continue") Console.ReadLine() Catch ex As Exception Throw New ExpectedExceptionType("Bad") Finally 'Clean up objects/whatever and continue Console.WriteLine("TEST") Console.ReadLine() End Try Console.WriteLine("Hi there, press enter to exit!") Console.ReadLine() End Sub Public Class ExpectedExceptionType Inherits Exception Public Sub New() End Sub Public Sub New(ByVal Message As String) MyBase.New(Message) Console.WriteLine("I know I'm getting into the exception.") End Sub Public Sub New(ByVal Message As String, ByVal Inner As Exception) MyBase.New(Message)
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