c# - How to reload an assembly for a .NET Application Domain?

Question

We are loading an assembly (a DLL) which reads a configuration file. We need to change the configuration file and then re-load the assembly. We see that after loading the assembly the 2nd time, there is no change in the configuration. Anyone see what is wrong here? We left out the details of reading in the configuration file.

AppDomain subDomain;
string assemblyName = "mycli";
string DomainName = "subdomain"; 
Type myType;
Object myObject;

// Load Application domain + Assembly
subDomain = AppDomain.CreateDomain( DomainName,
                                    null,
                                    AppDomain.CurrentDomain.BaseDirectory,
                                    "",
                                    false);

myType = myAssembly.GetType(assemblyName + ".mycli");
myObject = myAssembly.CreateInstance(assemblyName + ".mycli", false, BindingFlags.CreateInstance, null, Params, null, null);

// Invoke Assembly
object[] Params = new object[1];
Params[0] = value;
myType.InvokeMember("myMethod", BindingFlags.InvokeMethod, null, myObject, Params);

// unload Application Domain
AppDomain.Unload(subDomain);

// Modify configuration file: when the assembly loads, this configuration file is read in

// ReLoad Application domain + Assembly
// we should now see the changes made in the configuration file mentioned above

Answer 1

You can't unload an assembly once it's been loaded. However, you can unload an AppDomain, so your best bet would be to load the logic into a separate AppDomain and then when you want to reload the assembly you'll have to unload the AppDomain and then reload it.