hash table

[JustinN]

I need to create forms and save forms. I heard that a hashtable is a good way to do that. I have never used one before. Here is the code that I got.

THIS IS THE ERROR THAT IM GETTING

An unhandled exception of type 'System.InvalidCastException' occurred in AndersenAsi.exe

 

Additional information: Specified cast is not valid.

 

Dim CurrentForm As frmAddItemNumber = MyHashTable(1)

Dim NewForm As New Form1

Dim MyHashTable As New Hashtable

MyHashTable.Add(1, NewForm)

Dim CurrentForm As frmAddItemNumber = MyHashTable(1)

CurrentForm.Show()

Edited June 29, 2004 by JustinN

[Robby]

You can't just add a form to the hash table, you can add its contents though.

[JustinN]

any ideas?

[Nerseus]

You should be able to add/retrieve a form from a hashtable. You'll need to cast it to a form when you take it out - that's the compile problem. Here's the line to change:

Dim CurrentForm As frmAddItemNumber = DirectCast(MyHashTable(1), frmAddItemNumber)

 

-ner

[JustinN]

You should be able to add/retrieve a form from a hashtable. You'll need to cast it to a form when you take it out - that's the compile problem. Here's the line to change:

Dim CurrentForm As frmAddItemNumber = DirectCast(MyHashTable(1), frmAddItemNumber)

 

-ner

 

 

Tried what you posted but the result was the same.

 

Dim NewForm As New Form1

Dim MyHashTable As New Hashtable

MyHashTable.Add(1, NewForm)

Dim CurrentForm As frmAddItemNumber = DirectCast(MyHashTable(1), frmAddItemNumber)

CurrentForm.Show()

[PlausiblyDamp]

You are adding a variable of type Form1 to the HashTable and then trying to get a frmAddItemNumber out of the HashTable - they are different types hence the InvalidCastException.