How to get assembly file info?

[Brett]

Using Reflector,
URL:http://www.aisto.com/roeder/dotnet/D...=Reflector.zip, I
see in System.Reflecti on there is a class called AssemblyTitleAt tribute. It
has a read only property named Title. I do the following to get my
application name.

Private Sub Form1_Load(ByVa l sender As System.Object, ByVal e As
System.EventArg s) Handles MyBase.Load
Dim apptitle As System.Reflecti on.AssemblyTitl eAttribute

Me.Label1.Text = apptitle.Title. ToString
End Sub

Error is:

An unhandled exception of type 'System.NullRef erenceException ' occurred in
MainForm.exe

Additional information: Object reference not set to an instance of an
object.
However, if I try to declare an instance:
Dim apptitle As New System.Reflecti on.AssemblyTitl eAttribute

I get this error under apptitle:
Argument not specified for parameter 'title' of Public Sub New(Title As
String)

Can I use the above class to get the title? There's a work around available
to getting assembly file info but it requires a lot of code. I'd like to
understand what I have done wrong here though.

Thanks,
Brett

[Oenone]

Brett wrote:

Private Sub Form1_Load(ByVa l sender As System.Object, ByVal e As
System.EventArg s) Handles MyBase.Load
Dim apptitle As System.Reflecti on.AssemblyTitl eAttribute

Me.Label1.Text = apptitle.Title. ToString
End Sub
The problem here is that you declared an AssemblyTitleAt tribute object, but
you haven't set it to anything, so you just have a pointer to Nothing.
Dim apptitle As New System.Reflecti on.AssemblyTitl eAttribute

Here you're trying to create a brand new AssemblyTitleAt tribute. That's not
going to help you, as it won't have your assembly's title stored within it.

Try this:

Imports System.Reflecti on
[...]

Dim objTitle As AssemblyTitleAt tribute
objTitle = DirectCast( _
AssemblyTitleAt tribute.GetCust omAttribute( _
Me.GetType.Asse mbly, GetType(Assembl yTitleAttribute )), _
AssemblyTitleAt tribute)
Me.Label1.Text = objTitle.Title

This declares an AssemblyTitleAt tribute object, as in your first piece of
code, which initially points to Nothing.

It then uses the shared GetCustomAttrib ute member of the
AssemblyTitleAt tribute class to point the object at the
AssemblyTitleAt tribute object that is built into your project. It uses
DirectCast to cast this from the generic Object to the specific object type
being used (AssemblyTitleA ttribute).

Once this has been done you can just read the Title string from the object.

Hope that helps,

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(O) e n o n e