Object reference not set to an instance of an object (part 4)
Complete the catch function
[Previous post: Object reference not set to an instance of an object (part 3) : StackTrace Property ]
It is time to supplement the use of the catch function to make the error message more attractive. Here is the code:
''' <summary> ''' crash test and how to improve your coding ''' </summary> ''' <remarks></remarks> Public Class Form1 Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load End Sub ''' <summary> ''' pressing button1 will crash he program ''' this crash is the typical crashing type for all beginners ''' </summary> ''' <param name="sender"></param> ''' <param name="e"></param> ''' <remarks></remarks> Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click Dim aString() As String 'declare and array only Try 'a crash will occur and the code won't be able to handle it MsgBox(aString(0)) ' you do something with the array and and array is nothing Catch ex As Exception MsgBox(ex.StackTrace, MsgBoxStyle.Exclamation, ex.Message) 'add basic error message here End Try End Sub End Class |
Adding arguments to the function Msgbox, we enrich the MsgBox window. Here's what happens when you run the function and the program crashes:
Now all the functions that you create will have the function Try and catch function. Throughout your catch function, I recommend you use the StackTrace property with the small exclamation icon. Yes, a picture is worth a thousand words, do not forget.
This technique protection code is very simple and only take 4 lines! Use it.
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