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12781 Apr 12,2004 06:08 PM UTC Apr 12,2004 07:14 PM UTC WinForms 1
Tags: GridControl
Asked On April 12, 2004 06:08 PM UTC

I am looking for some documentation on the BeginUpdateOptions. Specifically, BeginUpdateOptions.Invalidate. I have the following code, which I am trying to optimize when I want to refresh the "viewable" portion of a grid. Thanks, STeve this.BeginUpdate(Syncfusion.Windows.Forms.BeginUpdateOptions.Invalidate); this.RefreshRange(this.ViewLayout.VisibleCellsRange,GridRangeOptions.None,true); this.EndUpdate(true);

Administrator [Syncfusion]
Replied On April 12, 2004 07:14 PM UTC

Normally you do not call RefreshRange within a Begin/End Update block. The idea of this block is to turn off the painting in this block. If you use this code, this.gridControl1.BeginUpdate(); this.gridControl1[2,1].Text = "aaaaa"; this.gridControl1[3,1].Text = "aaaaa"; this.gridControl1[4,1].Text = "aaaaa"; this.gridControl1[5,1].Text = "aaaaa"; this.gridControl1.EndUpdate(); then you will not see any changes until those cells are forced to repaint (maybe by dragging the form off/on the display, or by explicitly calling gridControl1.Refresh or RefreshRange. But if you use this code, this.gridControl1.BeginUpdate(Syncfusion.Windows.Forms.BeginUpdateOptions.Invalidate); this.gridControl1[2,1].Text = "aaaaa"; this.gridControl1[3,1].Text = "aaaaa"; this.gridControl1[4,1].Text = "aaaaa"; this.gridControl1[5,1].Text = "aaaaa"; this.gridControl1.EndUpdate(true); the cells get redrawn when the EndUpdate is called. The Invalidate option means that regions are marked invalid instead of being redrawn. Then on the EndUpdate call, a call to Control.Update is made that forces the paint to take place.


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