Raven65
Well-known member
- Joined
- Oct 4, 2006
- Messages
- 305
- Programming Experience
- 3-5
Alright, I'm not understanding something tonight.
I'm using the following code to run a background worker.
But I get this error: Handles clause requires a WithEvents variable defined in the containing type or one of its base types.
If I add a BackgroundWorker to the form via the Designer it works, what I don't understand is what I'm laking in the code to achieve the same thing.
First time trying this sorta setup really, so forgive the question if its to simple ;-)
I'm using the following code to run a background worker.
VB.NET:
[SIZE=2][COLOR=#0000ff]Public [/COLOR][/SIZE][SIZE=2][COLOR=#0000ff]Class[/COLOR][/SIZE][SIZE=2] Scraper[/SIZE]
[SIZE=2][COLOR=#0000ff]Dim[/COLOR][/SIZE][SIZE=2] myBackgroundWorker [/SIZE][SIZE=2][COLOR=#0000ff]As[/COLOR][/SIZE][SIZE=2] System.ComponentModel.BackgroundWorker[/SIZE]
[SIZE=2][COLOR=#0000ff]Private [/COLOR][/SIZE][SIZE=2][COLOR=#0000ff]Sub[/COLOR][/SIZE][SIZE=2] Scraper_Load([/SIZE][SIZE=2][COLOR=#0000ff]ByVal[/COLOR][/SIZE][SIZE=2] sender [/SIZE][SIZE=2][COLOR=#0000ff]As[/COLOR][/SIZE][SIZE=2] System.Object, [/SIZE][SIZE=2][COLOR=#0000ff]ByVal[/COLOR][/SIZE][SIZE=2] e [/SIZE][SIZE=2][COLOR=#0000ff]As[/COLOR][/SIZE][SIZE=2] System.EventArgs) [/SIZE][SIZE=2][COLOR=#0000ff]Handles [/COLOR][/SIZE][SIZE=2][COLOR=#0000ff]MyBase[/COLOR][/SIZE][SIZE=2].Load[/SIZE]
[SIZE=2] myBackgroundWorker.RunWorkerAsync()[/SIZE]
[SIZE=2] myBackgroundWorker.WorkerReportsProgress = [/SIZE][SIZE=2][COLOR=#0000ff]True[/COLOR][/SIZE]
[SIZE=2][COLOR=#0000ff]End [/COLOR][/SIZE][SIZE=2][COLOR=#0000ff]Sub[/COLOR][/SIZE]
[SIZE=2][COLOR=#0000ff]Private [/COLOR][/SIZE][SIZE=2][COLOR=#0000ff]Sub[/COLOR][/SIZE][SIZE=2] myBackgroundWorker_RunWorkerCompleted([/SIZE][SIZE=2][COLOR=#0000ff]ByVal[/COLOR][/SIZE][SIZE=2] sender [/SIZE][SIZE=2][COLOR=#0000ff]As[/COLOR][/SIZE][SIZE=2] System.Object, [/SIZE][SIZE=2][COLOR=#0000ff]ByVal[/COLOR][/SIZE][SIZE=2] e [/SIZE][SIZE=2][COLOR=#0000ff]As[/COLOR][/SIZE][SIZE=2] System.ComponentModel.RunWorkerCompletedEventArgs) [/SIZE][SIZE=2][COLOR=#0000ff]Handles[/COLOR][/SIZE][SIZE=2] myBackgroundWorker.RunWorkerCompleted[/SIZE]
[SIZE=2][COLOR=#008000] 'BGW has completed its task.[/COLOR][/SIZE]
[SIZE=2][COLOR=#0000ff]End [/COLOR][/SIZE][SIZE=2][COLOR=#0000ff]Sub[/COLOR][/SIZE]
[SIZE=2][COLOR=#0000ff]Private [/COLOR][/SIZE][SIZE=2][COLOR=#0000ff]Sub[/COLOR][/SIZE][SIZE=2] myBackgroundWorker_DoWork([/SIZE][SIZE=2][COLOR=#0000ff]ByVal[/COLOR][/SIZE][SIZE=2] sender [/SIZE][SIZE=2][COLOR=#0000ff]As[/COLOR][/SIZE][SIZE=2] System.Object, [/SIZE][SIZE=2][COLOR=#0000ff]ByVal[/COLOR][/SIZE][SIZE=2] e [/SIZE][SIZE=2][COLOR=#0000ff]As[/COLOR][/SIZE][SIZE=2] System.ComponentModel.DoWorkEventArgs) [/SIZE][SIZE=2][COLOR=#0000ff]Handles[/COLOR][/SIZE][SIZE=2] myBackgroundWorker.DoWork[/SIZE]
[SIZE=2][COLOR=#0000ff] Dim[/COLOR][/SIZE][SIZE=2] worker [/SIZE][SIZE=2][COLOR=#0000ff]As[/COLOR][/SIZE][SIZE=2] System.ComponentModel.BackgroundWorker = [/SIZE][SIZE=2][COLOR=#0000ff]CType[/COLOR][/SIZE][SIZE=2](sender, System.ComponentModel.BackgroundWorker)[/SIZE]
[SIZE=2][COLOR=#008000] 'Load Source Page[/COLOR][/SIZE]
[SIZE=2][COLOR=#008000] 'Parse For Images[/COLOR][/SIZE]
[SIZE=2][COLOR=#008000] 'Download Parsed Images[/COLOR][/SIZE]
[SIZE=2][COLOR=#008000] 'Report Progress Complete[/COLOR][/SIZE]
[SIZE=2] myBackgroundWorker.ReportProgress(100)[/SIZE]
[SIZE=2][COLOR=#0000ff]End [/COLOR][/SIZE][SIZE=2][COLOR=#0000ff]Sub[/COLOR][/SIZE]
[SIZE=2][COLOR=#0000ff]Public [/COLOR][/SIZE][SIZE=2][COLOR=#0000ff]Sub[/COLOR][/SIZE][SIZE=2] bgwCallback([/SIZE][SIZE=2][COLOR=#0000ff]ByVal[/COLOR][/SIZE][SIZE=2] strReport [/SIZE][SIZE=2][COLOR=#0000ff]As [/COLOR][/SIZE][SIZE=2][COLOR=#0000ff]String[/COLOR][/SIZE][SIZE=2])[/SIZE]
[SIZE=2][COLOR=#008000] 'Report Progress[/COLOR][/SIZE]
[SIZE=2][COLOR=#0000ff]End [/COLOR][/SIZE][SIZE=2][COLOR=#0000ff]Sub[/COLOR][/SIZE]
[SIZE=2][COLOR=#0000ff]End [/COLOR][/SIZE][SIZE=2][COLOR=#0000ff]Class[/COLOR][/SIZE]But I get this error: Handles clause requires a WithEvents variable defined in the containing type or one of its base types.
If I add a BackgroundWorker to the form via the Designer it works, what I don't understand is what I'm laking in the code to achieve the same thing.
First time trying this sorta setup really, so forgive the question if its to simple ;-)
