In my windows forms applications I have a class that extends a backgroundworker, let's call it ExtendedBGW1.cs in my form class I declare it like a member variable so I have scope for the entire class like so:
public partial class Main : Form
{
ExtendedBGW1 ebgw1;
}
Later on in the forms constructor I do this
public Main()
{
InitializeComponent();
ebgw1 = new ExtendedBGW1();
InitializeBackgoundWorker();
}
My InitializeBackgroundWoker() method looks like this
private void InitializeBackgoundWorker()
{
ebgw1.DoWork += new DoWorkEventHandler(ebgw1.worker_DoWork);
ebgw1.RunWorkerCompleted += new RunWorkerCompletedEventHandler(processWorkerCompleted);
ebgw1.ProgressChanged += new ProgressChangedEventHandler(processProgressChanged);
ebgw1.WorkerReportsProgress = true;
ebgw1.WorkerSupportsCancellation = true;
}
Now comes my design problem. I know now that I am going to have different more classes like my extenededBGW1.cs that will extend BackGroundWorker so I was thinking that if I create a IExtenedBackGroundWorker I could do something like this.
public partial class Main : Form
{
IExtenedBackGroundWorker ebgw1;
}
And still have the proper scope for the Main class. Then I could just create whichever implementation of IExtendedBackGroundWorker I need later on.
I can make the interface for the methods and properties without much issue but am really running into a problem when I try to wire up the events correctly between the interface the base class and the Main class.
Does anyone have any ideas?
Here are the errors I get in the Main
Error 1 Cannot assign to 'DoWork' because it is a 'method group'
and here is the error I get in my implemetation of the interface
Error 5 The event 'System.ComponentModel.BackgroundWorker.DoWork' can only appear on the left hand side of += or -=
here is what my interface looks like right now:
interface IExtendedBackGroundWorker
{
bool IsBusy { get; }
bool WorkerReportsProgress { get; set; }
bool WorkerSupportsCancellation { get; set; }
List<CompareObject> ObjList { get; set; }
string FilePath { get; set; }
void RunWorkerAsync();
void CancelAsync();
void DoWork();
void worker_DoWork(object sender, DoWorkEventArgs e);
void RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e);
void ProgressChanged(object sender, ProgressChangedEventArgs e);
}
Easy, just 1 - 2 - 3 - Done
public interface IMyWorker
{
bool WorkerReportsProgress { get; set; }
bool WorkerSupportsCancellation { get; set; }
event DoWorkEventHandler DoWork;
event ProgressChangedEventHandler ProgressChanged;
event RunWorkerCompletedEventHandler RunWorkerCompleted;
}
public class MyWorker : BackgroundWorker, IMyWorker
{
}
Usage:
namespace stackOverflow
{
class Program
{
static void Main(string[] args)
{
IMyWorker worker = new MyWorker();
worker.DoWork += new System.ComponentModel.DoWorkEventHandler(worker_DoWork);
}
static void worker_DoWork(object sender, System.ComponentModel.DoWorkEventArgs e)
{
throw new NotImplementedException();
}
}
}
Have fun :)