批量转换JPG尺寸和画质，并且可以旋转角度

可以批量转换JPG的尺寸和压缩的质量

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Drawing.Imaging;
using System.IO;
 
namespace JpgBatchConvert
{
    public partial class Form1 : Form
    {
        public Form1（）
        {
            InitializeComponent（）;
        }

        private void Form1_Load（object sender EventArgs e）
        {
            maxValue.KeyPress += tbox_KeyPress_Number;
        }

        private async void button1_Click（object sender EventArgs e）
        {
            if （dirPath.Text == ““）
            {
                MessageBox.Show（“请输入文件夹地址“）;
                return;
            }
            if （!Directory.Exists（dirPath.Text））
            {
                MessageBox.Show（“文件夹地址不存在“）;
                return;
            }
            if （maxValue.Text == ““）
            {
                MessageBox.Show（“高宽“）;
                return;
            }

            button1.Enabled = false;
            button1.Text = “转换中...“;

            await StartConvert（）;
            textBox1.Text = Global.ErrorFIle;
            Global.ErrorFIle = ““;

            MessageBox.Show（“全部转换成功“）;
            button1.Enabled = true;
            button1.Text = “开始转换“;
        }

        private Task StartConvert（）
        {
            int maxSize = int.Parse（maxValue.Text）;
            int jpgQuality = Convert.ToInt16（quality.Value）;
            Process process = new Process（）;
            IProgress progress = new Progress（（progressValue） => { label5.Text =“转换完成：“ + progressValue.ToString（）; }）;
            string LeftOrRight = “Right“;
            if（radioButton2.Checked）
                LeftOrRight = “Left“;
            return Task.Run（（） => process.batchConvert（progressmaxSizejpgQualitydirPath.Text checkBox1.Checked LeftOrRight））;
        }

        public static void tbox_KeyPress_Number（object sender System.Windows.Forms.KeyPressEventArgs e）
        {
            //数值输入控制：只能输入数字，点和回车
            if （!（char.IsNumber（e.KeyChar）） && e.KeyChar != （char）13 && e.KeyChar != （char）8 ）
                e.Handled = true;
        }
        
    }
}

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2020-02-27 15:29  JpgBatchConvert\
     目录           0  2020-02-27 15:29  JpgBatchConvert\.vs\
     目录           0  2020-02-27 15:29  JpgBatchConvert\.vs\JpgBatchConvert\
     目录           0  2020-02-27 15:29  JpgBatchConvert\.vs\JpgBatchConvert\v14\
     文件       49664  2016-11-16 21:28  JpgBatchConvert\.vs\JpgBatchConvert\v14\.suo
     目录           0  2020-02-27 15:29  JpgBatchConvert\.vs\JpgBatchConvert\v15\
     文件       53248  2020-01-05 16:09  JpgBatchConvert\.vs\JpgBatchConvert\v15\.suo
     目录           0  2020-02-27 15:29  JpgBatchConvert\.vs\JpgBatchConvert\v15\Server\
     目录           0  2020-02-27 15:29  JpgBatchConvert\.vs\JpgBatchConvert\v15\Server\sqlite3\
     文件           0  2019-04-20 19:10  JpgBatchConvert\.vs\JpgBatchConvert\v15\Server\sqlite3\db.lock
     文件      581632  2020-01-05 16:09  JpgBatchConvert\.vs\JpgBatchConvert\v15\Server\sqlite3\storage.ide
     目录           0  2020-02-27 15:29  JpgBatchConvert\JpgBatchConvert\
     文件         184  2018-01-23 08:35  JpgBatchConvert\JpgBatchConvert\App.config
     目录           0  2020-02-27 15:29  JpgBatchConvert\JpgBatchConvert\bin\
     目录           0  2020-02-27 15:29  JpgBatchConvert\JpgBatchConvert\bin\Debug\
     文件      207360  2020-01-05 15:59  JpgBatchConvert\JpgBatchConvert\bin\Debug\JpgBatchConvert.exe
     文件         184  2018-01-23 08:35  JpgBatchConvert\JpgBatchConvert\bin\Debug\JpgBatchConvert.exe.config
     文件       34304  2020-01-05 15:59  JpgBatchConvert\JpgBatchConvert\bin\Debug\JpgBatchConvert.pdb
     文件       24216  2018-01-23 08:58  JpgBatchConvert\JpgBatchConvert\bin\Debug\JpgBatchConvert.vshost.exe
     文件         184  2018-01-23 08:35  JpgBatchConvert\JpgBatchConvert\bin\Debug\JpgBatchConvert.vshost.exe.config
     文件         490  2013-03-18 17:00  JpgBatchConvert\JpgBatchConvert\bin\Debug\JpgBatchConvert.vshost.exe.manifest
     目录           0  2016-04-27 09:33  JpgBatchConvert\JpgBatchConvert\bin\Release\
     文件        2440  2020-01-05 15:59  JpgBatchConvert\JpgBatchConvert\Form1.cs
     文件       11010  2020-01-05 15:58  JpgBatchConvert\JpgBatchConvert\Form1.Designer.cs
     文件      147455  2020-01-05 15:58  JpgBatchConvert\JpgBatchConvert\Form1.resx
     文件         245  2019-04-20 19:14  JpgBatchConvert\JpgBatchConvert\Global.cs
     文件        3461  2020-01-05 15:56  JpgBatchConvert\JpgBatchConvert\JPG.cs
     文件        4254  2019-04-20 19:16  JpgBatchConvert\JpgBatchConvert\JpgBatchConvert.csproj
     目录           0  2020-02-27 15:29  JpgBatchConvert\JpgBatchConvert\obj\
     目录           0  2020-02-27 15:29  JpgBatchConvert\JpgBatchConvert\obj\Debug\
     文件        1452  2020-01-05 15:53  JpgBatchConvert\JpgBatchConvert\obj\Debug\DesignTimeResolveAssemblyReferences.cache
............此处省略25个文件信息