pass an Object to external .dll funcion and get a changed Object

Question

hi i have an external .dll function. i need to pass i.e. TextBox object to that function so that after the called Class finishes her job she must change i.e. TextBox.Text and get killed cant use the simple public variables. coz its about 112 objects that gonna use that Class. any suggestions? delegates? out? ref? what? stank you

simakas · Answer

a .dll was just an example of external class i was using... i know its a reference who is passed but i dont get that object changed :( manged that problem a few weeks ago dont remeber the line. if some one is interested - mail me... simakas@gmail.com it was smth wrong with local variable types in that .dll class.. cant remember thanks for reply anyway!

spgilmore · Answer

This is a managed DLL isn't it? So why does it make a difference if it is a DLL at all? A class is a class. The class may create a new instance of the object by making the function result or an OUT parameter be a TextBox. If you want to modify the instance itself you can simply pass the object itself as a parameter. Because it is a reference type the object you passed in will be modified directly by the function. If you were to pass a value type such as an integer you could either box it and pass it to an object parameter and unbox it to get the value back or use a REF parameter to have the function modify it directly.