Infragistics Ultragrid-使用PerformAutoResize降低性能

Question

I have badly performing code that uses Ultragrid, but running a visualisation analysis using D3.js on the trace output I discovered that grid__InitializeRow was calling itself multiple times.

Trigger created by: this.grid.InitializeRow += new Infragistics.Win.UltraWinGrid.InitializeRowEventHandler(this.grid_InitializeRow);

Problem starts with this code:

column.PerformAutoResize(PerformAutoSizeType.AllRowsInBand, true)

Searching the web I could not find information on this, but have found some possible contenders - calling any of these appears to call initialise row:

• grid.DataSource
• grid.Rows.Band.Layout.Bands
• column.performAutoResize

Questions

1. Is there documentation on this anywhere
2. Can I disable the trigger somehow temporarily

Thanks in advance

Answer 1

Found the answer via Infragistics forums :

Calling column.PerformAutoResize(PerformAutoSizeType.AllRowsInBand, true) triggers a rebind from the datasource, which in turn triggers initialise_row .

As the resize was called multiple times (once per column per band) the rebinds got out of hand.

For information we also had the following problems. With a year's data it was taking 2 minutes to render:

• It was a huge grid and the cells were being styled individually. Changing to using an Appearance library / factory shaved 40s off the load time
• Database tuning shaved another 40s off
• Changing the way custom totals rows were calculated shaved 15s off (by using total var instead of updating cell)
• AutoResize was a force multiplier - made all the other issues worse. Fixing that shaved more time off.

Hope this helps others with simiar problems

Answer 2

I couldn't make "PerformAutoResize" perform adequately. It would take 10s of seconds. So in the end I decided to roll my own, which is limited to our particular use of the grid config which only displays text in cells (as opposed to sub-controls), using the Graphics.MeasureString function for each grid cell.

About 40 lines of code and reduced time taken to 0.4 secs for a 600 x 20 grid.