asp.net简易图片压缩，缩略图实现

最新推荐文章于 2023-08-12 16:25:58 发布

翠花琳

最新推荐文章于 2023-08-12 16:25:58 发布

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本文链接：https://blog.youkuaiyun.com/chensirbbk/article/details/6370355

本文介绍了一种图片压缩类的实现方法，提供了两种不同的图片压缩算法。一种允许用户自定义压缩后的图片尺寸，另一种则通过指定百分比来保持原图的比例进行压缩。

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1.创建一个图片压缩类。

public Image ResourceImage;
        public string ErrorMessage;
        public ImageThumbnail(string ImageFileName)
        {
            ResourceImage = Image.FromFile(ImageFileName);
            ErrorMessage = string.Empty;
        }
        public bool ThumbnailCallback()
        {
            return false;
        }

        /// <summary>
        /// 方法一：可以自定义图片的高度和宽度
        /// </summary>
        /// <param name="Width">图片宽度</param>
        /// <param name="Height">图片高度</param>
        /// <param name="targetFilePath">图片路径</param>
        /// <returns></returns>
        public bool ReducedImage(int Width, int Height, string targetFilePath)
        {
            #region//处理缩略图的方法
            try
            {
                Image ReducedImage;
                Image.GetThumbnailImageAbort callb = new Image.GetThumbnailImageAbort(ThumbnailCallback);
                ReducedImage = ResourceImage.GetThumbnailImage(Width, Height, callb, IntPtr.Zero);
                ReducedImage.Save(@targetFilePath, ImageFormat.Jpeg);
                ReducedImage.Dispose();
                return true;
            }
            catch (Exception e)
            {
                ErrorMessage = e.Message;
                SystemErrorLogbll.inserErrorLog(e.Message + ":" + e.Source + ":" + e.TargetSite + ":ImageThumbnail.ReducedImage()处理缩略图的方法异常");
                return false;
            }
            #endregion
        }

#region

        方法2，按百分比缩小60% Percent为0.6 targetFilePath为目标路径
        public bool ReducedImage(double Percent, string targetFilePath)
        {
            try
            {
                Image ReducedImage;
                Image.GetThumbnailImageAbort callb = new Image.GetThumbnailImageAbort(ThumbnailCallback);
                ImageWidth = Convert.ToInt32(ResourceImage.Width * Percent);
                ImageHeight = (ResourceImage.Height) * ImageWidth / ResourceImage.Width;//等比例缩放
               ReducedImage = ResourceImage.GetThumbnailImage(ImageWidth, ImageHeight, callb, IntPtr.Zero);
                ReducedImage.Save(@targetFilePath, ImageFormat.Jpeg);
                ReducedImage.Dispose();
                return true;
            }
            catch (Exception e)
            {
                ErrorMessage = e.Message;
                return false;
            }
       }