private void DoWork(object sender, DoWorkEventArgs e)
{
BackgroundWorker worker = sender as BackgroundWorker;
bool failed = false;
MazeSolver solver = CreateSolver();
solver.Stage += SolverOnStage;
solver.SolveMaze(Maze.Value, SourceCell.Value, TargetCell.Value);
solver.Stage -= SolverOnStage;
if (!failed)
{
e.Result = solver;
}
void SolverOnStage(ProgressStage stage, Maze maze, float percentage)
{
if (worker.CancellationPending && (stage == ProgressStage.Started || stage == ProgressStage.Ongoing))
{
e.Cancel = true;
solver.Cancel();
}
switch (stage)
{
case ProgressStage.Failed:
failed = true;
break;
case ProgressStage.Ongoing:
worker.ReportProgress((int)percentage);
break;
}
}
}
