Class Library

Question

I created a class library named classlibrary1 and added reference to program TEST that calls the function
 When I run program to call function in class library I receive following error  'decimaltostring' is not declared
'===========================================================================================================
' Classlibrary1
' Class Library

 Public Class Class1
    Function decimaltostring(ByVal x_decimal As Decimal, ByRef x_string As String)
        x_string = x_decimal.ToString
        Return x_string
    End Function
End Class

'===========================================================================================================
'
' program TEST

Imports ClassLibrary1
Public Class mnu_main

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

        Dim my_decimal As Decimal = 4456.43
        Dim my_string As String = ""
        decimaltostring(my_decimal, my_string)

    End Sub
End Class
'===========================================================================================================

I have never done a class library before can someone help me with this basic module

---

Charlie Soroka

Answer 1

Hi Charlie,

Public  Function decimaltostring(ByVal x_decimal As Decimal, ByRef x_string As String)

I've forgotten make in class test this changes:

Dim c1 as New class1

c1.decimaltostring(my_decimal, my_string)

..... or

Public shared  Function decimaltostring(ByVal x_decimal As Decimal, ByRef x_string As String)

and in test:

class1.decimaltostring(my_decimal, my_string)

regards Ellen

---

Ich benutze/ I'm using VB2008 & VB2010

Answer 2

Thanks for reply Ellen:

I added dim c1 as new class1 and added the c1 to function call.  Program test will compile with no errors.

When I run program I receive following error: An error occurred creating the form. See Exception.InnerException for details.  The error is: Could not load file or assembly 'ClassLibrary1, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. An attempt was made to load a program with an incorrect format.

---

Charlie Soroka

Answer 3

I also tried the 2nd way by adding  Public SHARED to function and then added the class1 to the function call and received the following message: Could not load file or assembly 'ClassLibrary1, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. An attempt was made to load a program with an incorrect format.

---

Charlie Soroka

Answer 4

Hi Charlie,

it works- You have to make a reference of classLibrary1 in projekt test. (Assembly ClassLibrary1.dll) here sreenshot:

My project test here is named ConsoleApplication1

Here is the project solution:

and the code:

Imports ClassLibrary1
Module Module1
    Sub Main()
        Dim my_decimal As Decimal = 4456.43
        Dim my_string As String = ""
        Dim c1 As New Class1
        'OK
        c1.decimaltostring(my_decimal, my_string)
        'OK
        Class1.decimaltostring2(my_decimal, my_string)
    End Sub
End Module

and class1:

Public Class Class1
    Public Function decimaltostring(ByVal x_decimal As Decimal, ByRef x_string As String)
        x_string = x_decimal.ToString
        Return x_string
    End Function
    Public Shared Function decimaltostring2(ByVal x_decimal As Decimal, ByRef x_string As String)
        x_string = x_decimal.ToString
        Return x_string
    End Function
End Class

Please notice:

When You make changes in class1 You have to compile the whole solution. Otherwise this changes wil not be visible in the main project.

I hope this helps

regards Ellen

---

Ich benutze/ I'm using VB2008 & VB2010

Answer 5

Hello sorokateam,

I also tried the 2nd way by adding  Public SHARED to function and then added the class1 to the function call and received the following message: Could not load file or assembly 'ClassLibrary1, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. An attempt was made to load a program with an incorrect format.

---

Charlie Soroka

som moths ago i wrote this sample , hope this help , http://code.msdn.microsoft.com/Creazione-di-una-libreria-ec412ff4

This and only one example, but the written procedure and what matters.

Regards.

---

• Carmelo La Monica

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Answer 6

Hi Ellen:  I could not get to work so I deleted the test application and created again and was able to get it to work as per your code.  Thank you for your help.

---

Charlie Soroka