'System.InvalidCastException' in VB.net code

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In this snipit of code an error is halting the execution of the rest of the program, the error is as follows:

A first chance exception of type 'System.InvalidCastException' occurred in Microsoft.VisualBasic.dll

The code snipet:

VB

If Key1 = True & nMap(0, Count) = 0 Then
            nMap(0, Count) = 1
        ElseIf Key1 = True Then
            nMap(0, Count) = 0
        End If

I would like to know how to resolve this issue, any help would be appreciated, thank you

-Jordan

Posted 1-Jan-13 17:44pm

Sicppy

Updated 1-Jan-13 17:46pm

v2

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**Logi Guna** · Answer 1 · 2013-01-10T07:58:00

Solution 2

VB

If Key1 AndAlso (nMap(0, Count) = 0) Then
    nMap(0, Count) = 1
ElseIf Key1 Then
    nMap(0, Count) = 0
End If

Posted 10-Jan-13 7:58am

Logi Guna

Comments

Kschuler 10-Jan-13 15:34pm

You got my 5. You could have taken it a bit further to explain that in vb.net you use the keywords "AndAlso" and "OrElse" and that the & character is used to concat strings.

Christian Graus · Answer 2 · 2013-01-01T18:23:00

Solution 1

You don't tell us what nMap is, or what line has the error. You don't even tell us what Count IS. But, clearly you're using something that the system is trying to cast for you, as you're not doing any casting, and I'd say Count is the most likely contender. So, give us more info, or work out why the value of something in this code is being implicitly cast, and failing

Posted 1-Jan-13 18:23pm

Christian Graus

Comments

Sicppy 2-Jan-13 2:27am

nMap is an array, Count is a variable used in: for Count as Integer = 0 to 11

Christian Graus 2-Jan-13 2:28am

Well, the error means in implicit cast is failing, you need to learn to use your debugger, and work out why. OR at least tell us the line that has the error, and what the variables are.

Sicppy 2-Jan-13 2:37am

it throws the error when running and doesn't tell me what line its on

Sicppy 2-Jan-13 2:50am

I did some creative debugging and figured out that its on that first line

Sicppy 2-Jan-13 2:51am

Also I forgot to mention that Key1 is a boolean value getting the current state of the 'A' key