Tutorial ini akan menunjukkan kepada Anda bagaimana Anda dapat mengubah ukuran gambar secara dinamis di ASP.Net C#.

Anda perlu mengimpor namaspace untuk situs Anda.

//required .net objects
using System.Drawing;
using System.Drawing.Imaging;

Fungsi berikut akan mengubah ukuran gambar dengan menerima dimensi gambar yang Anda butuhkan, diikuti dengan lokasi di mana gambar berada dan terakhir di mana Anda ingin menyimpan gambar yang diperbarui/diubah ukurannya.

 //function to resize image
    public static void ResizeImage(int size, string filePath, string saveFilePath) {
        //variables for image dimension/scale
        double newHeight = 0;
        double newWidth = 0;
        double scale = 0;
        
        //create new image object
        Bitmap curImage = new Bitmap(filePath);
        
        //Determine image scaling
        if (curImage.Height > curImage.Width) {
            scale = Convert.ToSingle(size) / curImage.Height;
        } else {
            scale = Convert.ToSingle(size) / curImage.Width;
        }
        if (scale < 0 || scale > 1) { scale = 1;}

        //New image dimension
        newHeight = Math.Floor(Convert.ToSingle(curImage.Height) * scale);
        newWidth = Math.Floor(Convert.ToSingle(curImage.Width) * scale);

        //Create new object image
        Bitmap newImage = new Bitmap(curImage, Convert.ToInt32(newWidth), Convert.ToInt32(newHeight));
        Graphics imgDest = Graphics.FromImage(newImage);
        imgDest.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
        imgDest.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
        imgDest.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.HighQuality;
        imgDest.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
        ImageCodecInfo[] info = ImageCodecInfo.GetImageEncoders();
        EncoderParameters param = new EncoderParameters(1);
        param.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 100L);

        //Draw the object image
        imgDest.DrawImage(curImage, 0, 0, newImage.Width, newImage.Height);
        
        //Save image file
        newImage.Save(saveFilePath, info[1], param);
        
        //Dispose the image objects
        curImage.Dispose();
        newImage.Dispose();
        imgDest.Dispose();
    }

Demikian, Mudah2an Anda mungkin tertarik dengan artikel kami yang lain tentang Cara memotong gambar di ASP.Net C#