Using a method whose name is stored in a string

Question

I am trying to execute a method whose name is stored in a string ... for example

dim a as integer = warehouse.getTotalCount("item1")    'a is now equal to 100

but what i want to do is as so..

dim item1 as string = "item1"    
dim fctn = "warehouse.getTotalCount("+item1+")"
dim a as integer = run(fctn)   'and here a should be equal to 100

I have been trying to figure this out for some time now...

The functions may be coming from several different classes and I want to run the fully qualified name. How would I do this without using a case select?

EDIT: I am having trouble with

Type.GetType("warehouse")

or

Type.GetType("fctn")

Read about Reflection.

Konrad Kokosa
– Konrad Kokosa

2014-04-09 12:50:21 +00:00
Commented Apr 9, 2014 at 12:50 — Konrad Kokosa
– Konrad Kokosa, Commented Apr 9, 2014 at 12:50

Ric · Accepted Answer · 2014-04-09 13:10:53Z

2

This was taken from MethodBase.Invoke and should give you a general idea of how to do it, it's in C# but is easily convertable:

Type magicType = Type.GetType("MagicClass");
ConstructorInfo magicConstructor = magicType.GetConstructor(Type.EmptyTypes);
object magicClassObject = magicConstructor.Invoke(new object[]{});

// Get the ItsMagic method and invoke with a parameter value of 100

MethodInfo magicMethod = magicType.GetMethod("ItsMagic");
object magicValue = magicMethod.Invoke(magicClassObject, new object[]{100});

Try something like this:

Dim myMethod = wareHouse.GetType().GetMethod("getTotalCount")
Dim res = myMethod.Invoke(wareHouse, New Object() {100})

edited Apr 9, 2014 at 13:10

answered Apr 9, 2014 at 12:51

Ric

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10 Comments

freefaller Over a year ago

Although it's copied from MSDN, it would be helpful you also showed how magicType and magicClassObject were created

Ric Over a year ago

@freefaller added more detail.

Ishey4 Over a year ago

i am having trouble with Type.GetType("warehouse") or Type.GetType("fctn")

Ric Over a year ago

if warehouse is the instatiated object try this: dim myMethod = warehouse.GetType().GetMethod("getTotalCount") Dim result = myMethod.Invoke(warehouse, New Object(){100})

Ishey4 Over a year ago

no i never initalized the object... again thank you very much... sorry for the rookie mistake..

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