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ASP.NET: MVC Bitmap Image Creation and Download
Create an Image from within the MVC controller and send it to the browser (.NET Framework).
Download any file type from a controller in ASP.NET MVC using FileContentResult
.
This example creates a bitmap (jpeg) and sends it to the browser. The key is copying the output to a byte array.
See also: ASP.NET Core: MVC Bitmap Image Creation and Download
// Controller Method
public FileContentResult CreateBitmap()
{
int height = 200;
int width = 200;
System.Random r = new System.Random();
using (System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(width, height, System.Drawing.Imaging.PixelFormat.Format24bppRgb))
{
using(System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bmp))
{
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
g.Clear(System.Drawing.Color.LightGray);
g.DrawRectangle(System.Drawing.Pens.White, 1, 1, width - 3, height - 3);
g.DrawRectangle(System.Drawing.Pens.Gray, 2, 2, width - 3, height - 3);
g.DrawRectangle(System.Drawing.Pens.Black, 0, 0, width, height);
g.DrawString("Refresh Me!", new System.Drawing.Font("Arial", 10, System.Drawing.FontStyle.Bold),
System.Drawing.SystemBrushes.WindowText, new System.Drawing.PointF(r.Next(50), r.Next(100)),
new System.Drawing.StringFormat(System.Drawing.StringFormatFlags.DirectionVertical));
g.FillRectangle(new System.Drawing.SolidBrush(System.Drawing.Color.FromArgb(r.Next(155), r.Next(255),
r.Next(255), r.Next(255))), r.Next(width), r.Next(height), 100, 50);
int x = r.Next(width);
g.FillRectangle(new System.Drawing.Drawing2D.LinearGradientBrush(new System.Drawing.Point(x, 0),
new System.Drawing.Point(x + 75, 100), System.Drawing.Color.FromArgb(128, 0, 0, r.Next(255)),
System.Drawing.Color.FromArgb(255, r.Next(192, 255), r.Next(192, 255), r.Next(255))), x, r.Next(height), 75, 50);
string filename = Server.MapPath("/") + System.Guid.NewGuid().ToString("N");
bmp.Save(filename, System.Drawing.Imaging.ImageFormat.Jpeg);
byte[] bytes;
using (System.IO.FileStream stream = new System.IO.FileStream(filename, System.IO.FileMode.Open))
{
bytes = new byte[stream.Length];
stream.Read(bytes, 0, bytes.Length);
}
System.IO.File.Delete(filename);
return new FileContentResult(bytes, "image/jpeg");
}
}
}
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