.NET (Core and Framework)

private void Form1_Load(object sender, EventArgs e)
{
    DataGridViewLinkColumn col = new DataGridViewLinkColumn();
    dataGridView1.Columns.Add(col);
    for (int i = 0; i < 4; i++)
    {
        DataGridViewRow dr = new DataGridViewRow();
        dataGridView1.Rows.Add(dr);
    }
    for (int i = 0; i < 4; i++)
        dataGridView1.Rows[i].Cells[0].Value = "view";
}

private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)
{
    dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Value = "hide";
}

Graphics g = this.CreateGraphics(); 
MessageBox.Show(g.DpiX.ToString() + Environment.NewLine + g.DpiY.ToString());
g.Dispose();
g = null;

Bitmap bitmap=new Bitmap(100, 100);
Graphics gBM=Graphics.FromImage(bitmap);
Console.WriteLine("DpiX="+gBM.DpiX);
gBM.Dispose();

Luc Pattyn wrote:

I fail to see why...wouldn't work in a WPF app?

fjparisIII wrote:

The problem with WPF is that there are gaps in it; ... before achieving functional closure

Luc Pattyn wrote:

Have you read some of the "why WPF sucks today"

Luc Pattyn wrote:

Would you consider writing an article? Seems you could tilt the balance a bit on WPF...

Luc Pattyn wrote:

It would become tricky if and when you have several monitors with different properties...

fjparisIII wrote:

But I think the DPI Scaling number applies to the operating system as a whole

fjparisIII wrote:

I've posed the question on the WPF forum

Luc Pattyn wrote:

I am convinced under the hood the DPI setting is just one of the Display Settings, and exists separately for each display.

Luc Pattyn wrote:

I wouldn't mind if you were to signal a solution here as well (if and when you get one that is).

fjparisIII wrote:

I would be delighted to see some actual proof of this

// Find out which monitor the ViewerWindow should be on.
_left = Monitor.Rect.left;
_top = Monitor.Rect.top;
_width = Monitor.Width;
_height = Monitor.Height;
//
// Account for the DPI scaling of this monitor.
Matrix m = PresentationSource.FromVisual(this).CompositionTarget.TransformToDevice;
double dpiX = m.M11;
double dpiY = m.M22;
_left /= dpiX;
_top /= dpiY;
_width /= dpiX;
_height /= dpiY;