Is it possible to change the value of a string property within a .NET AppDomain from another seperate .NET AppDomian.

Question

Hi,

Is it possible to change the value of a public property (type string) of a class within a given .NET AppDomain from another separate .NET AppDomain assuming both AppDomain's are running in the same process. The other important assumption is that the code running in the AppDomain that contains the property can not be modified .. ie .. recompiled with any changes.

Thanks!

Answer 1

Sure. You just need to expose access to the property via a MarshalByRef object that will allow one instance in AppDomain A to reach out and touch the property in AppDomain B.

Here is a simple example of the class that would be instantiated in AppDomain B from AppDOmain A:

   internal class SomeLinkClass : MarshalByRefObject
   {
      internal void UpdateProperty(string newValue)
      {
         // this function actually will execute within AppDomain B

         // somehow get access to the property and then set it 
         // with the new value.
      }
   }

And here is how you would consume it from AppDomain A:

// somehow you need to get a ref to AppDomain B
    SomeLinkClass linkClass = appDomainB.CreateInstanceFromAndUnwrap(
                                  Assembly.GetExecutingAssembly().Location,
                                  typeof(SomeLinkClass).FullName) as SomeLinkClass;