CODEWITHSUNDEEP
.netwinformsdatagridviewrepaintpaint
Yuriy
Yuriy

Reputation: 2691

How to improve painting performance of DataGridView?

(sorry for bad English)

I have a big problem with performance of DataGridView when it re-paints.

I'm using a DataGridView to show logs from an external application stream. Messages from the stream come in with a high frequency (less than 1 ms). If I add new row to the DataGridView immediately when each new message comes, the DataGridView doesn't have time to re-paint itself before the next message comes.

A possible solution is to use a queue to collect messages and re-paint DataGridView every 100 ms with messages from queue. This is good but the DataGridView blinks when it auto-scrolls to the last row. (Smooth scroll is disabled)

Can you help me to improve DataGridView performance?

Upvotes: 20

Views: 29058

Answers (6)

Tomas Kubes
Tomas Kubes

Reputation: 25128

Clean Solution without reflection is:

public class DataGridViewDoubleBuffered : DataGridView
{
   public DataGridViewDoubleBuffered()
   {
       DoubleBuffered = true;
   }
}

Then go to myForm.designer.cs and change a type from DataGridView to DataGridViewDoubleBuffered .

Upvotes: 7

Mou
Mou

Reputation: 16292

i use this solution and saw bit fixed.

Reflection is used so import this too in code

using System.Reflection;

typeof(DataGridView).InvokeMember("DoubleBuffered",
BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.SetProperty,
null,this.dataGridView1,new object[] { true });

Upvotes: 3

Algernoncharles
Algernoncharles

Reputation: 31

When working with large amounts of data, the DataGridView control can consume a large amount of memory in overhead, unless you use it carefully. On clients with limited memory, you can avoid some of this overhead by avoiding features that have a high memory cost.

You can also manage some or all of the data maintenance and retrieval tasks yourself using virtual mode in order to customize the memory usage for your scenario. More detail you can visit dapfor. com

Upvotes: 3

Alex Burtsev
Alex Burtsev

Reputation: 12668

Also read MSDN article: Best Practices for Scaling the Windows Forms DataGridView Control

Upvotes: 3

Jroc
Jroc

Reputation: 488

Have you enabled double buffering for the grid view?

have a look at Horrible redraw performance of the DataGridView on one of my two screens

if you haven't already for some ideas

Upvotes: 9

dandan78
dandan78

Reputation: 13864

I recently had some slowness issues with DataGridView and the solution was the following code

public static void DoubleBuffered(this DataGridView dgv, bool setting)
{
    Type dgvType = dgv.GetType();
    PropertyInfo pi = dgvType.GetProperty("DoubleBuffered",
          BindingFlags.Instance | BindingFlags.NonPublic);
    pi.SetValue(dgv, setting, null);
}

It turns double buffering on for DataGridView objects. Just call DoubleBuffered() on your DGV. Hope it helps.

Edit: I might've gotten this off SO, but I can't search for the original right now so this is just to emphasize that the code isn't mine.

Upvotes: 48

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