Well tonight while I was deleting some spam comments from my blog and watching Dr. Who with my wife, I found a rather interesting comment.
So the story was:
First there is a VB6 DLL that had a class called Class1 with code like the following:
public type emprecord
name as string
Public Sub Fn(T()as emprecord)
MsgBox "The silence is comming said Prisoner 0"
When this little dll was called from a VB.NET big brother
Dim test as new prj.class1
Dim em(0) as prj.emprecord 'able to create it no problem
test.fn(em) ' here gives error
An error ocurred... well this is not very document issue with the TLBIMP tool which creates the interop assemblies. See StackOverflow Answer. The workaround is to right click on your type library, select properties, and change Embed interop Types to false.
After that you will be able to call your function.
Some people ofter forget about this (even me ) So that;’s why I’m posting about this.
In my work (at Artinsoft) we are currently performing a lot of Winforms and VB6
migration to Silverlight. And a common problem is “What can I do with the user settings!!!”.
In VB6 you had your INI files and in Winforms you probably used something like the App settings.
But when you move to Silverlight what can you do!.
You need a set of initial values and you probably wont want to “burn” those inicial values in your XAP file.
It would be nicer if those values can just be set in the Web.Config file.
So a common way to solve this, is develop a simple helper class. This helper class will use a service that will
collect your initial ini files or appsettings values and store them in your Isolated Storage.
You can even use some kind of basic cryptography if you feel that your date is sensitive.
And then you can use the helpful IsolatedStorageSettings class. For example see this code,
that I borrowed from this post: http://wildermuth.com/2008/10/21/Using_Isolated_Storage_Settings_in_Silverlight_2
const string FAVCOLORNAME = "favoriteColor";
public Color? FavoriteColor
if (IsolatedStorageSettings.ApplicationSettings[FAVCOLORNAME] != null)
Color? colorSetting = IsolatedStorageSettings.ApplicationSettings[FAVCOLORNAME] as Color?;
if (colorSetting != null) return colorSetting;
// If we can't find a favorite color, return a null color
return new Color?();
IsolatedStorageSettings.ApplicationSettings[FAVCOLORNAME] = value;
As you can see is very easy to save and recover simple settings from the Silverlight Isolated Storage