TableLayoutPanel extremely slow

2
votes

I am using TableLayoutPanel in C# (Forms). My table is pretty big with its 33 columns and 8 rows. All cells contain Label-objects.

I have already set DoubleBuffered = true; of my TableLayoutPanel by creating a new subclass:

public class DoubleBufferedTableLayoutPanel : TableLayoutPanel
{
    public DoubleBufferedTableLayoutPanel()
    {
        DoubleBuffered = true;
    }
}

If a user presses button X, all cell-controls are deleted and other labels are loaded into the table (from an array which contains all Label objects).

DEL: this.table.Controls.Remove(this.table.GetControlFromPosition(col, row));

ADD: this.table.Controls.Add(this.labelArray[row, (col+pos)], col, row);

Everything works fine, except that the progress of deleting the controls and adding the new ones takes five to ten seconds.

Is there a way other than to set DoubleBuffered = true in order to speed up this process?

4
c#tablelayoutpanel
Are you using Threading? - fantasitcalbeastly
have you tried embedding your Add/Remove calls between SuspendLayout & ResumeLayout calls? - olydis
@LokiSinclair not while filling the table... How do I implement that best? Create two threads which both fill half the table? - libjup
@olydis Nope, but will try right now - libjup
@olydis +1 it's faster now but still a pretty long delay (a couple of seconds...) - libjup

4 Answers

2
votes

Use this code to avoid the slow processing of events in C#

tableLayoutPanel1.Visible = false;
tableLayoutPanel1.Controls.Clear();
tableLayoutPanel1.SuspendLayout();

  // Processing Code

tableLayoutPanel1.ResumeLayout();
tableLayoutPanel1.Visible = true;
0
votes

I may be wrong but this sounds like a job for a datagridview, which is optimised for these tasks.

0
votes

Are you getting the Data from the database to populate the tablelayoutpanel everytime you perform an action (postback)?

If so, consider lazy loading the data in to a bindable object once when the page first loads. Then use the populated object when re binding (on Postback).

0
votes

Try this code

TableLayoutPanel.GetType().GetProperty("DoubleBuffered",
                System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic)
                .SetValue(TableLayoutPanel, true, null);