黄兵的个人博客

图片上传及压缩处理

压缩类 -- ImageThumbnail ，可按大小、比例进行压缩

using System;
using System.IO;
using System.Drawing;
using System.Drawing.Imaging;

namespace cw.doctor.Core.Images
{
    public class ImageThumbnail
    {
        public Image ResourceImage;
        private int ImageWidth;
        private int ImageHeight;
        public string ErrorMessage;

        public ImageThumbnail(string ImageFileName)
        {
            ResourceImage = Image.FromFile(ImageFileName);
            ErrorMessage = "";
        }

        public bool ThumbnailCallback()
        {
            return false;
        }


        // 方法1，按大小
        public bool ReducedImage(int Width, int Height, string targetFilePath)
        {
            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;
                return false;
            }
        }


        // 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;
            }
        }


    }

}

public ActionResult upload(string tel)
        {
            if (Request.Files.Count == 0)
            {
                return base.Error("文件不存在！");
            }
            List<string> lst = new List<string>();
            for (int i = 0; i < Request.Files.Count; i++)
            {
                var file = Request.Files[i];
                string path = AppDomain.CurrentDomain.BaseDirectory;
                var filePath = $"upload/Medical/{tel}/{DateTime.Now.ToString("yyyyMM")}";
                if (!Directory.Exists(Path.Combine(path, filePath)))
                {
                    Directory.CreateDirectory(Path.Combine(path, filePath));
                }
                var guid = Guid.NewGuid().ToString();
                string fileName = $"{filePath}/{guid}.{file.FileName.Substring(file.FileName.LastIndexOf(".") + 1)}";
                file.SaveAs(path + fileName);
                ImageThumbnail img = new ImageThumbnail(path + fileName);
                img.ReducedImage(242, 200, $"{path + filePath}/{guid}_2.{file.FileName.Substring(file.FileName.LastIndexOf(".") + 1)}");//0.4表示缩小40%
                img.ResourceImage.Dispose(); //这里要释放一下
                lst.Add($"/{fileName}");
            }
            return Success(lst);
        }