Question

We have a method that accesses a network share. This method works fine when called directly, but we get a System.IO.IOException when it is called via reflecton. It appear that the user context is not available to the reflected code (see stack trace below). Is there a way to prevent this?

System.Reflection.TargetInvocationException: Exception has been thrown by 
the target of an invocation. ---> System.IO.IOException: Logon failure:
unknown user name or bad password.
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.Directory.InternalGetFileDirectoryNames(String path, 
String userPathOriginal, String searchPattern, Boolean includeFiles,
Boolean includeDirs, SearchOption searchOption)
at System.IO.Directory.GetDirectories(String path, String searchPattern, 
SearchOption searchOption)

this works

   Library.Class obj =new Library.Class();
   obj.Execute(serverPath);

this does not work

    Assembly assembly = Assembly.LoadFile(@"pathTo\Library.dll");
    Type type = assembly.GetType("Library.Class");
    MethodInfo executeMethod = type.GetMethod("Execute");
    object classInstance = Activator.CreateInstance(type, null);
    object[] parameterArray = new object[] { serverPath};
    executeMethod.Invoke(classInstance, parameterArray);

Where Library.Class.execute is defined as

public void Execute(string serverPath){
   string[] directories = Directory.GetDirectories(serverPath, 
                          "1.*", SearchOption.TopDirectoryOnly);
    foreach (var directory in directories) {
        Console.WriteLine(directory);    
    }
}

and serverPath is a network share that required the user enter credentials.

—–Update 1——-

This appears to be somewhat environmental–I have at least one test machine where everything works. I’ll be doing some more testing to determine what differences matter.

Answer 1

This appears to have been some sort of fluke environmental issue. We have not been able to reproduce the problem since the test machine was restarted.