save canvas as pdf on specific path

Question

I want to save canvas as pdf .画布另存为 pdf。
I can get download option using given code, but I did not get proper way to save pdf on specific path.
Can anyone help me to save canvas as pdf on specific path?
Here is my javascript code.

function saveAsPdf() {
    var canvas = new fabric.Canvas('c', { selection: false});
    var customerId = getParameterByName("intCustomerId");
    var image = canvas.toDataURL();
    image = image.replace('data:image/png;base64,', '')
    var imgData = canvas.toDataURL('image/png');
    var doc = new jsPDF('p', 'mm');
    doc.save('sample-file.pdf');
}

Answer 1

I found that directly we can't save pdf to specific path.So I used another way to save it.

    string tempFileName = "temp.png";
    tempPathToSave = HttpContext.Current.Server.MapPath(tempFileName);
    using (FileStream fs = new FileStream(tempPathToSave, FileMode.Create))
    {
        using (BinaryWriter bw = new BinaryWriter(fs))
        {
            byte[] data = Convert.FromBase64String(imageData);
            bw.Write(data);
            bw.Close();
        }
        fs.Close();
    }
    PdfDocument doc = new PdfDocument();
    doc.Pages.Add(new PdfPage());
   using (XImage img = XImage.FromFile(tempPathToSave))
   {
     XGraphics xgr = XGraphics.FromPdfPage(doc.Pages[0]);
     xgr.DrawImage(img, 0, 0);
     doc.Save(pathToSave);
     doc.Close(); 
   }
    if (File.Exists(tempPathToSave))
       File.Delete(tempPathToSave);

Simply, saved canvas to temparary image and converted image into PDF. I used PDFSharp.dll for this.