c＃.net覆盖提示不起作用

Question

I have a user data report that needs to be saved as pdf, but when I put the overwrite prompt to true the overwrite message when there is a filename that exist is not showing. Here's my code.

SaveFileDialog svg = new SaveFileDialog();
svg.FileName = "Data Report - All Books";//set default file name
svg.Filter = "Pdf Files|*.pdf";

if (svg.ShowDialog() == DialogResult.OK)
{
    svg.OverwritePrompt = true;//tell user to overwrite existing file name
    using (FileStream stream = new FileStream(svg.FileName + ".pdf", FileMode.Create))
    {
        Document pdfDoc = new Document(PageSize.A1, 10f, 10f, 10f, 0f);
        PdfWriter.GetInstance(pdfDoc, stream);

        pdfDoc.Open();
        pdfDoc.Add(pdfTable);
        pdfDoc.Close();
        stream.Close();
    }
    MetroMessageBox.Show(this, "Successfully save PDF report.", "SUCESS!", MessageBoxButtons.OK, MessageBoxIcon.Information);
}

Answer 1

You have to set the overwrite prompt before dialog is shown. MSDN does mention OverWritePrompt by default is set to true.

SaveFileDialog svg = new SaveFileDialog();
svg.FileName = "Data Report - All Books";//set default file name
svg.Filter = "Pdf Files|*.pdf";

//This needs to be before dialog is shown.
svg.OverwritePrompt = true;//tell user to overwrite
if (svg.ShowDialog() == DialogResult.OK)
{
    using (FileStream stream = new FileStream(svg.FileName + ".pdf", FileMode.Create))
    {
        Document pdfDoc = new Document(PageSize.A1, 10f, 10f, 10f, 0f);
        PdfWriter.GetInstance(pdfDoc, stream);

        pdfDoc.Open();
        pdfDoc.Add(pdfTable);
        pdfDoc.Close();
        stream.Close();
    }
    MetroMessageBox.Show(this, "Successfully save PDF report.", "SUCESS!", MessageBoxButtons.OK, MessageBoxIcon.Information);
}