Reflection to call method in class implementing interface

Njn Bat

I have 2 dll's . One Dll has interface "InterfaceStart" . Second dll has a class "AbServicesStart" which implements the interface.

I must create the instance of the class and call the implemented start method .

I have tried below code how ever i get an exception saying A first chance exception of type 'System.Reflection.TargetException' occurred in mscorlib.dll Additional information: Object does not match target type .

Can u help me figure out the issue.

string assemblyPath = "D:\\APP\\AbInterface.dll";

string assemblyClassPath = "D:\\APP\\ABServe.dll";
Assembly assembly = Assembly.LoadFrom(assemblyPath);

Assembly assemblyClass = Assembly.LoadFrom(assemblyClassPath);
Type AbserveStart = assembly.GetType("AB.ABServe.InterfaceStart");
Type classstart = assemblyClass.GetType("AB.AbInterface.AbServicesStart");
MethodInfo startMethod = AbserveStart.GetMethod("Start");
object interfaceObject = Activator.CreateInstance(classstart);

startMethod.Invoke(interfaceObject, null);

3 Replies

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Vulpes11y ago
Accepted answer
Instead of getting the interface's Type object from AbInterface.dll, I'd try and get it from AbServicesStart's Type object:

string assemblyClassPath = "D:\\APP\\ABServe.dll";
Assembly assemblyClass = Assembly.LoadFrom(assemblyClassPath);
Type classstart = assemblyClass.GetType("AB.AbInterface.AbServicesStart");
Type AbserveStart = classstart,GetInterface("AB.ABServe.InterfaceStart");
MethodInfo startMethod = AbserveStart.GetMethod("Start");
object interfaceObject = Activator.CreateInstance(classstart);
startMethod.Invoke(interfaceObject, null);
Vulpes11y ago
Glad I could help :)
Njn Bat11y ago
I am not sure how i must thank you but you were a life saver :)