. net background upload pictures without saving pictures to compress pictures

Before compressing pictures in the background, we always save the pictures to the server first , Then compress the picture ; Now you can avoid saving pictures in advance by file streaming , Make a note of

Specific code

var file= Request.Form.Files[0];
Image image = System.Drawing.Image.FromStream(file.OpenReadStream());
Bitmap bmpCut = new Bitmap(512, 377, PixelFormat.Format24bppRgb);
Graphics g = Graphics.FromImage(bmpCut);
g.DrawImage(image, new Rectangle(0, 0, 512, 377), new Rectangle(0, 0, image.Width, image.Height), GraphicsUnit.Pixel);
g.Dispose();
image.Dispose();

Image.FromStream Method : Create from the specified data stream Image.

IFormFile.OpenReadStream: Open the request stream to read the uploaded file