How to prevent row flicker in datagrid when application starts

Question

In the application I'm currently developing, I am using datagridview to display the data. To fill it, I have to click a button, and the background worker will start working, it will fill in the data, and when it finishes work, it will use the datatable as the data source for the datagrid. This works great, the user interface remains responsive and so on. But now I have applied the coloring to the strings, depending on their values ​​(I still play with it, so any suggestions are welcome):

        private void ApplyColoring()
    {
        if (dataGridView1.DataSource != null)
        {
            foreach (DataGridViewRow dataGridRow in dataGridView1.Rows)
            {
                // hardmap a color to a column
                IDictionary<Int32, Color> colorDictionary = new Dictionary<Int32, Color>();
                colorDictionary.Add( 7, Color.FromArgb(194, 235, 211));
                colorDictionary.Add( 8, Color.Salmon);
                colorDictionary.Add( 9, Color.LightBlue);
                colorDictionary.Add(10, Color.LightYellow);
                colorDictionary.Add(11, Color.LightGreen);
                colorDictionary.Add(12, Color.LightCoral);
                colorDictionary.Add(13, Color.Blue);
                colorDictionary.Add(14, Color.Yellow);
                colorDictionary.Add(15, Color.Green);
                colorDictionary.Add(16, Color.White);

                foreach (DataGridViewRow gridRow in dataGridView1.Rows)
                {
                    foreach (DataGridViewCell cell in gridRow.Cells)
                    {
                        if (colorDictionary.Keys.Contains(cell.ColumnIndex))
                        {
                            // standard background 
                            cell.Style.BackColor = Color.FromArgb(194, 235, 211);
                        }
                    }
                }

                IList<String> checkedValues = new List<String>();


                // first we loop through all the rows
                foreach (DataGridViewRow gridRow in dataGridView1.Rows)
                {
                    IDictionary<String, Int32> checkedVal = new Dictionary<String, Int32>();

                    // then we loop through all the data columns
                    int maxCol = dnsList.Count + 7;
                    for (int columnLoop = 7; columnLoop < maxCol; columnLoop++)
                    {
                        string current = gridRow.Cells[columnLoop].Value.ToString();

                        for (int checkLoop = 7; checkLoop < maxCol; checkLoop++)
                        {
                            string check = gridRow.Cells[checkLoop].Value.ToString();

                            if (!current.Equals(check))
                            {
                                if (checkedVal.Keys.Contains(current))
                                {
                                    gridRow.Cells[columnLoop].Style.BackColor = colorDictionary[checkedVal[current]];
                                }
                                else
                                {
                                    gridRow.Cells[columnLoop].Style.BackColor = colorDictionary[columnLoop];
                                    checkedVal.Add(current, columnLoop);
                                }
                            }
                        }
                    }
                }
            }
        }
    }

. , . - , hella . , , , , , datagrid . , , (, , ) backgroundworker. applycoloring RunWorkerCompleted, . , ? , ( NOT LOSING ).

Answer 1

:

• SuspendLayout() ResumeLayout() . BeginUpdate() EndUpdate() (Listviews, Combobox ..).
• VirtualMode DataGridView, .

Answer 2

.

VB:

Imports System.Reflection

, . Form_Load

Dim systemType As Type = DataGridView1.GetType()
Dim propertyInfo As PropertyInfo = systemType.GetProperty("DoubleBuffered", BindingFlags.Instance Or BindingFlags.NonPublic)
propertyInfo.SetValue(DataGridView1, True, Nothing)

#: : DataGridView

Answer 3

datagrids:

datagrid:

public static class DataGridViewExtensioncs
{

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

do:

this.dataGrid.DoubleBuffered(true);

Evolved Shweta Lodha: http://www.codeproject.com/Tips/390496/Reducing-flicker-blinking-in-DataGridView

Answer 4

SuspendLayout . ResumeLayout.

Answer 5

( , "" ), .

:

dataGridView1.CellValueChanged += new DataGridViewCellEventHandler(dataGridView1_CellValueChanged);

private void dataGridView1_CellPainting(object sender, DataGridViewCellPaintingEventArgs e)
    {
            if (dataGridView1.Columns[5].Index == e.ColumnIndex && e.RowIndex >= 0 && dataGridView1[5, e.RowIndex].Value.ToString() != "0")
            {
                e.CellStyle.BackColor = Color.PaleGreen;
            }
    }

, ,

Answer 6

, :

using System;
using System.Reflection;
using System.Windows.Forms;

public static class ExtensionMethods
{
   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);
   }
}

datagridview

dataGridView1.DoubleBuffered(true);