TeamAAS-VP-HeShuo/TeamAAS-VM/Core/ImageHelper.cs

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace TeamAAS_VP.Core
{
    public class ImageHelper
    {
        /// <summary>
        /// 压缩并保存图片
        /// </summary>
        /// <param name="bitmap"></param>
        /// <param name="path">目标图像存储路径JPEG</param>
        /// <param name="quality">压缩等级，0到100，0 最差质量，100 最佳</param>
        public static void CompressImage(Bitmap bitmap, string path, long quality = 100)
        {
            ImageCodecInfo codecInfo = GetEncoderInfo("image/jpeg");
            System.Drawing.Imaging.Encoder encoder = System.Drawing.Imaging.Encoder.Quality;
            EncoderParameters parameters = new EncoderParameters(1);
            EncoderParameter parameter = new EncoderParameter(encoder, quality);
            parameters.Param[0] = parameter;
            bitmap.Save(path, codecInfo, parameters);
            bitmap.Dispose();
            parameter.Dispose();
            parameters.Dispose();
        }

        private static ImageCodecInfo GetEncoderInfo(String mimeType)
        {
            int j;
            ImageCodecInfo[] encoders;
            encoders = ImageCodecInfo.GetImageEncoders();
            for (j = 0; j < encoders.Length; ++j)
            {
                if (encoders[j].MimeType == mimeType)
                    return encoders[j];
            }
            return null;
        }
    }
}