BeginUpdateOptions

[Steve]

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]

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.