CODEWITHSUNDEEP
c#winforms
Anil
Anil

Reputation: 318

Quick way to hide rows in datagridview winforms

I'm trying to make a window forms application in which I need to hide and show rows of a datagridView quite frequently. Currently and using a loop 

for (int i=0;i<grid.Rows.Count;i++){
    grid.Rows[i].Visible = false;
}

But this is making my UI too slow, is there a faster way to do this?? Thanks in advance.

Upvotes: 4

Views: 14802

Answers (3)

PKanold
PKanold

Reputation: 148

VB.net rather than C#:

Turning on DoubleBuffering will improve your performance:

dgvMain.[GetType].GetProperty("DoubleBuffered", BindingFlags.Instance Or BindingFlags.NonPublic).SetValue(dgvMain, True, Nothing)

Also dgvMain.SuspendLayout() and dgvMain.ResumeLayout() may help.

I found an additional boost in performance by hiding all the DataGridView Columns (and the DataGridViewRow Headers) before running the row hiding function and then making the columns / headers visible again after.

-OO-

Upvotes: 0

TaW
TaW

Reputation: 54433

You can remove all rows after storing them in a list and add them back as needed:

List<DataGridViewRow> rows = null;


// prepare list
rows = new List<DataGridViewRow>();
// copy rows to list
rows.AddRange(dataGridView1.Rows.Cast<DataGridViewRow>());
// remove them all
dataGridView1.Rows.Clear();


// add them back:
dataGridView1.Rows.AddRange(rows.ToArray());
// clean up
rows.Clear();

Upvotes: 4

Foitn
Foitn

Reputation: 746

What you could do is if you are using the DataSource as input:

For normal operation:

grid.DataSource = yourList;

In case you want to hide certain elements:

grid.DataSource = yourList.Where(x => x.SomeBool).ToArray();

Note:

Sometimes the datasource isn't fully renewed like this, therefore you could try to set it to null first, resulting in:

grid.DataSource = null;
grid.DataSource = yourList.Where(x => x.SomeBool).ToArray();

Upvotes: 4

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