"Dynamicly" create variables

[Guest]

Hi!

I would like to dim variables using dynamic code, like following:

Dim type as String = "Integer"
Dim variable as [type]

(the issue is in fact about my own types,
but let us isolate the issue using the native types)

Best regards,
Benjamin

 

[Patrice]

Dim variable As Integer ?? Generics (2.0), using "Object" (the type is not
supposed to be known at compile time ?), creating code using CodeDom ?

Explaining what you are trying to do may help...

In particular if doing simply :
Dim variable As Integer
You can use Variable.GetType to get the type as a type variable (ie. the
other way round, you can the type name from the variable instead of
creating the variable using the type name).

Patrice

 

[Jon Skeet [C# MVP]]

I would like to dim variables using dynamic code, like following:

Dim type as String = "Integer"
Dim variable as [type]

(the issue is in fact about my own types,
but let us isolate the issue using the native types)

If you don't know the type at compile-time, what use do you expect to
get from declaring a variable of that type? You couldn't do anything
more with it (at least with Option Strict On) than you could with
Object.

 

[Brian]

Hello Benjamin,


I agree with Jon, if you don't know it's type, you won't be able to do much
with it.
But, I managed to do what you're asking for:



using System;
using System.Runtime.Remoting;

statc void Example()
{

int MyInt = 0;

string NameOfType = MyInt.GetType().FullName.ToString();
string NameOfAssembly = MyInt.GetType().Assembly.FullName.ToString();

ObjectHandle hnd = Activator.CreateInstance(NameOfAssembly, NameOfType);

int MyNewlyCreatedInt = (int) hnd.Unwrap();

}

 

[Jon Skeet [C# MVP]]

I agree with Jon, if you don't know it's type, you won't be able to do much
with it.
But, I managed to do what you're asking for:

Not quite.

using System;
using System.Runtime.Remoting;

statc void Example()
{

int MyInt = 0;

string NameOfType = MyInt.GetType().FullName.ToString();
string NameOfAssembly = MyInt.GetType().Assembly.FullName.ToString();

ObjectHandle hnd = Activator.CreateInstance(NameOfAssembly, NameOfType);

int MyNewlyCreatedInt = (int) hnd.Unwrap();

}

That's creating a new instance (I'd just use the version which returned
an Object reference personally) but it's not creating a new *variable*
as requested. I suspect the OP doesn't really need to create a new
variable though - it's hard to say without more information.