Every program has error and we meet it again and again sometimes we need to copy exception message and VB 2005 not provide convenient way to copy it.
This article demonstrate how we handler exception while development phase.
1. Create class for contain exception data.
Public Class ExceptionData
Public FileName As String
Public ClassName As String
Public Method As String
Public Section As String
Public Ex As Exception
Sub New(ByVal strFileName As String, ByVal strClassName As String)
Me.FileName = strFileName
Me.ClassName = strClassName
End Sub
End Class
2. Create class for handler Error.
this class is use for create text for display for us.
Public Class ErrorHandler
Public Shared Sub ShowError(ByVal cEx As ExceptionData)
Dim f As New frmShowErrorforDebug
f.ErrorDisplay = GetStringfromException(cEx)
f.ShowDialog()
End Sub
Public Shared Function GetStringfromException(ByVal File As String, ByVal ClassName As String, ByVal Method As String, ByVal Section As String, ByVal EX As Exception) As String
Dim strB As New System.Text.StringBuilder
strB.Append(“Error Occur “).Append(vbCrLf).Append(vbCrLf)
strB.Append(“File :”).Append(File).Append(vbCrLf)
strB.Append(“ClassName :”).Append(ClassName).Append(vbCrLf)
strB.Append(“Method :”).Append(Method).Append(vbCrLf)
If Not IsNothing(Section) Then
If Section.Trim <> “” Then
strB.Append(“Section :”).Append(Section).Append(vbCrLf)
End If
End If
strB.Append(“Source :”).Append(EX.Source).Append(vbCrLf)
strB.Append(“Method throw current exception :”).Append(EX.TargetSite.Name).Append(vbCrLf)
strB.Append(“Message :”).Append(EX.Message).Append(vbCrLf)
strB.Append(vbCrLf).Append(vbCrLf)
strB.Append(“Stack Trace :”).Append(EX.StackTrace)
Return strB.ToString
End Function
Public Shared Function GetStringfromException(ByVal cEx As ExceptionData) As String
Return GetStringfromException(cEx.FileName, cEx.ClassName, cEx.Method, cEx.Section, cEx.Ex)
End Function
End Class
3. Create frmShowErrorforDebug
in this case we just use for Windowsform application, this form is just contain one textbox for show error data and two button one for copy error data to clipboard ,two for close form.
If you want to handler error for web application you just change from windows form to webform instead.
Public Class frmShowErrorforDebug
Public ErrorDisplay As String
Private Sub frmShowError_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Me.TextBox1.Text = errordisplay
End Sub
Private Sub btnCopy_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCopy.Click
Clipboard.SetText(Me.TextBox1.Text)
End Sub
Private Sub btnClose_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnClose.Click
Me.Close()
End Sub
End Class
Now we already created classes for handler error and then we will test it.
Public Class frmLogin
Private FileName As String = “frmLogin.vb”
Private cEx As New ExceptionData(FileName, “frmLogin”)
Private Sub btnTestError_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnTestError.Click
cEx.Method = “btnTestError_Click”
Try
Dim str As String = “Hello”
cEx.Section = “Convert str to dbl”
Dim dbl As Double = CDbl(str)
Catch ex As Exception
cEx.Ex = ex
ErrorHandler.ShowError(cEx)
End Try
End Sub
End Class
It done.
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