WPF C# datagrid fix view row (fix scroll)

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i am working on WPF datagrid and want to fix view after insert row at top, whenever row insert at top view scroll down by 1 row, i am using following code

C#

int i = 0;
DataTable dt = null;

private void UserControl_Loaded(object sender, RoutedEventArgs e)
{
    dt = new DataTable();
    dt.Columns.Add("Col1");
    dt.Columns.Add("Col2");

    DispatcherTimer dtimer = new DispatcherTimer();
    dtimer.Tick += new EventHandler(dt_Tick);
    dtimer.Interval = new TimeSpan(0, 0, 1);
    dtimer.Start();
    dataGrid1.DataContext = dt;


}
void dt_Tick(object sender, EventArgs e)
{
    DataRow dr;
    dr = dt.NewRow();
    dr["Col1"] = i;
    dr["Col2"] = i;
    dt.Rows.InsertAt(dr, 0);
    i++;
}

i tried to use dataGrid1.ScrollIntoView(dataGrid1.SelectedItem); but it still need selected item, and even it scroll down till last row in view

I can manage to do the same in DataGridView of windows form in following way

C#

DataGridViewCell cell = dataGridView1.FirstDisplayedCell;
dt.Rows.InsertAt(dr, 0);
dataGridView1.FirstDisplayedCell = cell;

looking for any similar ways to do this in WPF also

Thanks.

Posted 12-May-13 5:24am

suhas kalambe

Updated 12-May-13 8:12am

Sandeep Mewara

v2

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Thomas Duwe · Answer 1 · 2013-05-15T21:39:00

Solution 1

Hi,

so what's preventing you from making the inserted row either the selected item and/or using the created row to call ScrollIntoView?

So it should be enough to write:

C#

void dt_Tick(object sender, EventArgs e)
{
   DataRow dr;
   dr = dt.NewRow();
   dr["Col1"] = i;
   dr["Col2"] = i; 
   dt.Rows.InsertAt(dr, 0);
   i++;

   // either do a scroll to inserted row
   dataGrid1.ScrollIntoView(dr);

   // or select item
   // dataGrid1.SelectedItem = dr;
   

   // and then scroll selected item into view
   // dataGrid1.ScrollIntoView(dataGrid1.SelectedItem);
}

Hope this helps.

Posted 15-May-13 21:39pm

Thomas Duwe

Comments

suhas kalambe 19-May-13 1:41am

Hi Thomas,

Thanks for post,

but
dataGrid1.ScrollIntoView(dr);
this works on new inserted row and it'll come into view, this is fine in one scenario

I have one more scenario
I want to freeze my view, like if i am having 3 rows, and after insert 1 more at top i still want old 3 rows in view

when i do this
dataGrid1.ScrollIntoView(dataGrid1.SelectedItem);
the selected row not going out of view but it scroll down all the ways in view

Please try this in winforms with datagridview
DataGridViewCell cell = dataGridView1.FirstDisplayedCell;
dt.Rows.InsertAt(dr, 0);
dataGridView1.FirstDisplayedCell = cell;

i want similar case

Thanks.

Thomas Duwe 21-May-13 3:43am

You didn't mention this second case in detail, so I couldn't begin to guess as to what you really want.
But regardless, this second case is almost the same: remember the first/last row you want to be visible and
call dataGrid1.ScrollIntoView(itemToScrollTo);
Remember that itemToScrollTo needs to be the DataRow of your DataTable.