C#缩略图图像生成，用于大型图像出现内存不足异常 [英] C# Thumbnail Image generation for large images getting Out Of Memory exception

问题描述

请找到以下代码以生成图像的缩略图版本:

 

public class ThumbnailGenerator
    {
        public void GenerateThumnail(int thumbWidth, string src, string dest)
        {

            try
            {
                using (System.Drawing.Image image = System.Drawing.Image.FromFile(src))
                {
                    int srcWidth = image.Width;
                    int srcHeight = image.Height;
                    int thumbHeight = Convert.ToInt32(Math.Round(Convert.ToDouble
                                                            (Convert.ToDouble(srcHeight) / Convert.ToDouble(srcWidth) * thumbWidth), 
                                                                                                                       MidpointRounding.ToEven));

                    using (Bitmap bmp = new Bitmap(thumbWidth, thumbHeight))
                    {
                        using (System.Drawing.Graphics gr = System.Drawing.Graphics.FromImage(bmp))
                        {
                            gr.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
                            gr.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
                            gr.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
                            gr.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.HighQuality;

                            System.Drawing.Rectangle rectDestination = new System.Drawing.Rectangle(0, 0, thumbWidth, 
                                                                                                                                           thumbHeight);
                            gr.DrawImage(image, rectDestination, 0, 0, srcWidth, srcHeight, GraphicsUnit.Pixel);

                            bmp.Save(dest, System.Drawing.Imaging.ImageFormat.Jpeg);
                        }
                    }
                }
            }
            catch
            {
                throw;
            }
        }  
    }

解决方案

Bitmap.GetThumbnailImage()也会出错吗?

Please find the following code to generate a thumbnail version of an image:

 

public class ThumbnailGenerator
    {
        public void GenerateThumnail(int thumbWidth, string src, string dest)
        {

            try
            {
                using (System.Drawing.Image image = System.Drawing.Image.FromFile(src))
                {
                    int srcWidth = image.Width;
                    int srcHeight = image.Height;
                    int thumbHeight = Convert.ToInt32(Math.Round(Convert.ToDouble
                                                            (Convert.ToDouble(srcHeight) / Convert.ToDouble(srcWidth) * thumbWidth), 
                                                                                                                       MidpointRounding.ToEven));

                    using (Bitmap bmp = new Bitmap(thumbWidth, thumbHeight))
                    {
                        using (System.Drawing.Graphics gr = System.Drawing.Graphics.FromImage(bmp))
                        {
                            gr.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
                            gr.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
                            gr.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
                            gr.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.HighQuality;

                            System.Drawing.Rectangle rectDestination = new System.Drawing.Rectangle(0, 0, thumbWidth, 
                                                                                                                                           thumbHeight);
                            gr.DrawImage(image, rectDestination, 0, 0, srcWidth, srcHeight, GraphicsUnit.Pixel);

                            bmp.Save(dest, System.Drawing.Imaging.ImageFormat.Jpeg);
                        }
                    }
                }
            }
            catch
            {
                throw;
            }
        }  
    }

解决方案

Do you also get an error with Bitmap.GetThumbnailImage()?

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