Execute code at runtime

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Aug 15th, 2003, 12:56 AM
Nalar

Execute code at runtime

Does VB.net allow for a way of executing a string of code at runtime?

I've seen code using System.CodeDom.Compiler but it needs to compile an entire VB object and run it seperatley from the program. I just need to execute one line. (I have seen vb6 code that does this but that was 2 years ago)

Basically i'm trying to grab a form name from a database and display the form.

Thanks in advance.
Aug 18th, 2003, 04:16 PM
neodatatype

Re: Execute code at runtime
Quote:

Does VB.net allow for a way of executing a string of code at runtime?

Basically i'm trying to grab a form name from a database and display the form.

Sure!

You can do this using Reflection.
It does not compile a thing, just retrieve informations about objects and methods into assemblies and let you call them at runtime.

Take a look to this example:
VB Code:
```
Assembly a = Assembly.Load(strMyAssemblyFile);
Type     oType = a.GetType(strCompleteNamespaceAndClassName);
object   oMyObj = Activator.CreateInstance(oType);
 
MethodInfo oMethod = oType.GetMethod(strMethodName);
oMethod.Invoke(oMyObj, new object[] {MyParam});
```
Bye!
Aug 18th, 2003, 04:41 PM
Lunatic3
If the forms are within his project not an external assembly he can simply use this:
VB Code:
```
Dim frm As Form = Activator.CreateInstance(Type.GetType("Namespace.FormName"))
frm.Show()
```
Where NameSpace.FormName is the full name of the form type he wants to use.
Aug 18th, 2003, 05:23 PM
Pirate

One API function can does this , it was a little challenging on VB6 forum , look it up there , you may find it .