public void ProcessRequest(HttpContext context)
{
try {
if (context.Request["WebSheetFieldDefID"] != null)
{
Int64.TryParse(context.Request["WebSheetFieldDefID"].ToString().Trim(), out WebSheetFieldDefID);
}
/*png images are used because the background of rectangles/lines can be set to transparent. For gif images the process of making the background transparent is convoluted*/
context.Response.ContentType = "image/png";
ODWebServiceEntities db = new ODWebServiceEntities();
var sfdObj = db.webforms_sheetfielddef.Where(sfd => sfd.WebSheetFieldDefID == WebSheetFieldDefID).First();
SheetFieldType FieldType = (SheetFieldType)sfdObj.FieldType;
Bitmap bmp = null;
Graphics g = null;
Pen p = new Pen(Color.Black, 2.0f);//1.0f does not show, this is a bug in the Drawing namespace.
if (FieldType == SheetFieldType.Rectangle || FieldType == SheetFieldType.Line)
{
bmp = new Bitmap(sfdObj.Width, sfdObj.Height);
g = Graphics.FromImage(bmp);
//g.Clear(Color.Transparent);
}
if (FieldType == SheetFieldType.Rectangle)
{
g.DrawRectangle(p, 0, 0, sfdObj.Width, sfdObj.Height);
}
if (FieldType == SheetFieldType.Line)
{
g.DrawLine(p, 0, 0, sfdObj.Width, sfdObj.Height);
}
if ((SheetFieldType)sfdObj.FieldType == SheetFieldType.Image)
{
string ImageData = sfdObj.ImageData;
bmp = PIn.Bitmap(ImageData);
}
/* These 3 lines are used in lue of the shorter "bmp.Save(context.Response.OutputStream,ImageFormat.Png);" because it does not work with png images.*/
MemoryStream MemStream = new MemoryStream();
bmp.Save(MemStream, System.Drawing.Imaging.ImageFormat.Png);
MemStream.WriteTo(context.Response.OutputStream);
if (FieldType == SheetFieldType.Rectangle || FieldType == SheetFieldType.Line)
{
g.Dispose();
}
bmp.Dispose();
}
catch (Exception ex) {
Logger.LogError("WebSheetFieldDefID=" + WebSheetFieldDefID, ex);
}
}