dataGridView.Rows.Count and datagridview.RowCount

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dataGridView.Rows.Count and datagridview.RowCount

Postby SePp » Wed, 16 Jan 2008 19:05:17 GMT 

Hello all,

I want to display the number of items in an datagridview. I use this
one datagridview for different datasets.


The datagridview.Rowcount works fine for the most of the dataset. But
there is one dataset which has more items
than the others and the Rowcount wont work. The result is all the time
0, but it should be something like 85.

// Datsource
this.dataGridView1.DataSource = this.REMINDERBindingSource;
this.v_REMINDERTableAdapter.Fill(this.subnr.REMINDER);

// Display number of items
lbl_row.Text = dataGridView1.RowCount.ToString();
MessageBox.Show(this, dataGridView1.Rows.Count.ToString());

Has somebody an Idea?  Thanks in advance.

Greets
SePp
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Similar Threads:

1.dataGridView.Rows.Count and datagridview.RowCount 

On Jan 15, 11:05燼m, SePp < XXXX@XXXXX.COM > wrote:
> Hello all,
>
> I want to display the number of items in an datagridview. I use this
> one datagridview for different datasets.
>
> The datagridview.Rowcount works fine for the most of the dataset. But
> there is one dataset which has more items
> than the others and the Rowcount wont work. The result is all the time
> 0, but it should be something like 85.
>
> // Datsource
> this.dataGridView1.DataSource = this.REMINDERBindingSource;
> this.v_REMINDERTableAdapter.Fill(this.subnr.REMINDER);
>
> // Display number of items
> lbl_row.Text = dataGridView1.RowCount.ToString();
> MessageBox.Show(this, dataGridView1.Rows.Count.ToString());
>
> Has somebody an Idea? 燭hanks in advance.
>
> Greets
> SePp

I have a solution....

I don't use the count for the datagridview I use the Dataset instead:

 MessageBox.Show(this, this.dataset_name.Rows.Count.ToString());

Thanks

2.Datagridview confused on row count 

I have a windows form with the datagridview that displays data from a
single table. The underlying data can be updated/deleted from another
component.

In our case, we raise an event when any underlying changes happen. We
then have been trying to refresh our grid without much luck.

We use:
this.DataSet.Offers.Clear();
this.offersTableAdapter.Fill(this.DataSet.Offers);
this.offersBindingSource.ResetBindings(false);
this.offersDataGridView.Refresh();

We have tried multiple variations but the underlying data is fairly
small. Unfortunately, if a row is deleted often the grid will then
think that two rows have been deleted. If the grid is refreshed a
second time, then the correct rows are shown.

Can someone suggest the proper way to go about this or point out the
error in our refresh syntax?

Thanks

3.DataGridView.RowCount setting is slow 

I have DataGridView in virtual mode containing 3500 rows.
In code below, assigning to RowCount value to 3500 takes 8 seconds.
CPU usage goes high at this time.
Stepping by F11 into user code shows few celltemplate property getters and
combobox/datecombo constructor calls without database access  which does not 
take a lot of time.

Debug output (below)  shows lot of messages Stepping over non-user code.
Running in release mode from Windows this line speed is same (slow).

How to speed up grid creation ?

Using C# Express 2008 3.5 SP1 in Vista.

Andrus.

class Grid : System.Windows.Forms.DataGridView {

        internal void SetDataRetriever(DataRetriever<TEntity> dataRetriever)
        { ......
            SuspendLayout();
            Enabled  = false;
            int cnt = DataRetriever.RowCount + (ReadOnly ? 0 : 1);
            // next line takes 8 seconds:
            RowCount = cnt;
            Enabled = true;
            ResumeLayout();
        }

        protected override void
OnCellValueNeeded(DataGridViewCellValueEventArgs e)
        {
            if (!Enabled)
                return;
             ...
        }

        protected override void OnRowEnter(DataGridViewCellEventArgs e)
        {
            if (!Enabled)
                return;
            ...
         }
}

Debug output window contains:

Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.RowCount.set'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewColumn.CellTemplate.get'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.CompleteCellsCollection'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewColumn.CellTemplate.get'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.CompleteCellsCollection'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewTextBoxCell.DataGridViewTextBoxCell'
Step into: Stepping over non-user code
'System.Windows.Forms.PropertyStore.GetObject'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewCell.Style.get'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewTextBoxCell.Clone'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.CompleteCellsCollection'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewColumn.CellTemplate.get'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.CompleteCellsCollection'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewColumn.CellTemplate.get'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.CompleteCellsCollection'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewTextBoxCell.DataGridViewTextBoxCell'
Step into: Stepping over non-user code
'System.Windows.Forms.PropertyStore.GetObject'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewCell.Style.get'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewTextBoxCell.Clone'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.CompleteCellsCollection'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewColumn.CellTemplate.get'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.CompleteCellsCollection'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewColumn.CellTemplate.get'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.CompleteCellsCollection'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewTextBoxCell.DataGridViewTextBoxCell'
Step into: Stepping over non-user code
'System.Windows.Forms.PropertyStore.GetObject'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewCell.Style.get'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewTextBoxCell.Clone'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.CompleteCellsCollection'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.CompleteCellsCollection'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.CompleteCellsCollection'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewComboBoxCell.DataGridViewComboBoxCell'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewComboBoxCell.FlatStyle.set'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewComboBoxCell.DisplayStyleForCurrentCellOnly.set'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewComboBoxCell.Clone'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.CompleteCellsCollection'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewColumn.CellTemplate.get'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.CompleteCellsCollection'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewColumn.CellTemplate.get'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.CompleteCellsCollection'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewTextBoxCell.DataGridViewTextBoxCell'
Step into: Stepping over non-user code
'System.Windows.Forms.PropertyStore.GetObject'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewCell.Style.get'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewTextBoxCell.Clone'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.CompleteCellsCollection'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.CompleteCellsCollection'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.CompleteCellsCollection'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewComboBoxCell.DataGridViewComboBoxCell'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewComboBoxCell.FlatStyle.set'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewComboBoxCell.DisplayStyleForCurrentCellOnly.set'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewComboBoxCell.Clone'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.CompleteCellsCollection'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.RowTemplateClone.get'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewRowCollection.Add'
Step into: Stepping over non-user code
'System.Windows.Forms.Control.Enabled.get'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.OnRowEnter'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.SetCurrentCellAddressCore'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.SetAndSelectCurrentCellAddress'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewTextBoxCell.DataGridViewTextBoxCell'
Step into: Stepping over non-user code
'System.Windows.Forms.PropertyStore.GetObject'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewCell.Style.get'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewTextBoxCell.Clone'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewRow.CloneCells'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewTextBoxCell.DataGridViewTextBoxCell'
Step into: Stepping over non-user code
'System.Windows.Forms.PropertyStore.GetObject'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewCell.Style.get'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewTextBoxCell.Clone'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewRow.CloneCells'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewTextBoxCell.DataGridViewTextBoxCell'
Step into: Stepping over non-user code
'System.Windows.Forms.PropertyStore.GetObject'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewCell.Style.get'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewTextBoxCell.Clone'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewRow.CloneCells'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewComboBoxCell.DataGridViewComboBoxCell'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewComboBoxCell.FlatStyle.set'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewComboBoxCell.DisplayStyleForCurrentCellOnly.set'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewComboBoxCell.Clone'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewRow.CloneCells'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewTextBoxCell.DataGridViewTextBoxCell'
Step into: Stepping over non-user code
'System.Windows.Forms.PropertyStore.GetObject'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewCell.Style.get'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewTextBoxCell.Clone'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewRow.CloneCells'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewComboBoxCell.DataGridViewComboBoxCell'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewComboBoxCell.FlatStyle.set'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewComboBoxCell.DisplayStyleForCurrentCellOnly.set'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewComboBoxCell.Clone'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewRow.CloneCells'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewRow.Clone'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewRowCollection.this[int].get'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.SetSelectedCellCore'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.SetSelectedElementCore'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.ClearSelection'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.SetAndSelectCurrentCellAddress'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.OnRowCollectionChanged_PostNotification'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewRowCollection.InsertCopiesPrivate'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewRowCollection.Add'

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5.Copy current row values to new row in DataGridView 

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How to initialize some new row values from current row ?

How to get last row number which was current if Ctrl+Down arrow key was 
pressed ?

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