Problem with Try...Catch in the CF

I'm having a very serious problem using Try & Catch in my Pocket PC project.

If I put in any exception catching into my code, when my program comes to call the method containing the Try...Catch it causes a MissingMethodException.

If I take/comment out all of the Try...Catch's the code runs fine, unless a real exception occurs, which is obviously where my delema lies.

If I catch exceptions, my program never works. If I don't, my program sometimes works. Both of which are unacceptable.

a (crap) example:

VB Code:

Imports System.IO
 
public shared sub Main() 
    ' This is where the MissingMethodException is created
    Process_Files()
end sub
 
public shared sub Process_File()
 
    Dim fs As New StreamReader("/file.txt")
 
    Dim sLine as String = fs.ReadLine()
    ' if I comment out the Try...Catch the Exception wont be created
    Try
        Dim i = Convert.ToInt32(sLine)
    Catch
        Console.WriteLine("Invalid File")
        Return
    End Try
 
    Console.WriteLine(sLine + " x 2 = " + i*2)
 
End Sub

this is causing your trouble....

Quote:

---

Try
Dim i = Convert.ToInt32(sLine)
Catch

---

you need to Dim i outside the Try block as it doesnt know what i is on this line..... Console.WriteLine(sLine + " x 2 = " + i*2)
, eg:

VB Code:

Dim fs As New StreamReader(New FileStream("C:\file.txt",FileMode.Open))
Dim sLine as String
Dim i As Integer
While Not fs.Peek()
    sLine = fs.ReadLine()
End While
Try
    i = Convert.ToInt32(sLine)
    Console.WriteLine(sLine + " x 2 = " + i*2)
Catch ex As Exception
    MessageBox.Show(ex.Message)
End Try

Ok, sorry, bad example, that was just one I typed up on the fly, here's some real code:

VB Code:

Private Sub frmMenu_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
 
            Dim dbFile As String = "\Program Files\MyApp\db.sdf"
 
            Try
                If Not File.Exists(dbFile) Then
                    Dim engine As New SqlCeEngine("Data Source = '" + dbFile + "'; Password = 'moocow'")
                    engine.CreateDatabase()
                End If
 
                ' Global is another class
                ' dbCon is a Public Shared SqlServerCe.SqlCeConnection
                Global.dbCon = New SqlServerCe.SqlCeConnection("Data Source = '" + dbFile + "'; Password = 'moocow'")
                Global.dbCon.Open()
 
            Catch ex As SqlCeException
                For Each err As SqlCeError In ex.Errors
                    MessageBox.Show(err.ToString, "Unable to Open Database")
                    Me.Close()
                    Return
                Next
 
            End Try
 
        End Sub

Again with the Try...Catch this code dies with a MissingMethodException when the form tries to load. The constructor works fine, and creates the form no problem, but when it tries to Load (Show) the form, it dies.

If I comment out the Try...Catch the code works perfectly, as expected.

I appreciate any & all the help you can give me.


PS, congrats on your baby girls.

thanks for the congrats :)
have you tried commenting out just the error section , eg:

VB Code:

'For Each err As SqlCeError In ex.Errors
                    'MessageBox.Show(err.ToString, "Unable to Open Database")
                    'Me.Close()
                    'Return
                'Next

it maybe the For Next loop that's throwing the App.

Yeah I've tried that, to no avil :(

This one has really got me stumpped, it's as if the program gets to a method that contains a Try, it doesn't know what a Try is, and raises the MissingMethodException. That's the only logical conclution I've come to :/

It's now doing this for methods that don't even contain Try...Catches :/ and If i put a break point on the offending method call, and press F8 when it gets there, the code bombs out straight away, without even entering the method

Why is it saying it can't find a method that is contained in the same class as the calling sub! I'm not using remoting, or dynamic loading or anything special, this is such a noddy program, and it just doesn't work!

I think I'll go and cry in a corner now...