windows窗口程序，获取当前文件夹下的“preview”结尾的png，转换成1位的bmp

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.Drawing2D;
using System.Drawing.Imaging;
using System.Threading;
using System.IO;

namespace TextureConversion2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        //存储获取到的图片路径
        List filePaths = new List();

        void load()
        {
            string imgtype = "*.PNG";//"*.PNG|*.JPG|*.GIF|*BMP"
            string[] ImageType = imgtype.Split('|');
            for (int i = 0; i < ImageType.Length; i++)
            {
                //获取指定文件夹下所有的图片路径  
                string[] dirs = Directory.GetFiles(Environment.CurrentDirectory.ToString(), ImageType[i]);
                for (int j = 0; j < dirs.Length; j++)
                {//判断是否为preview图片
                    int _index = dirs[j].IndexOf(".");
                    string _str = dirs[j].Substring(_index - 7, 7);
                    if (_str == "preview")
                    {
                        filePaths.Add(dirs[j]);
                    }
                }
            }
        }

        //压缩测试
        void CompressTest()
        {
            for (int i = 0; i < filePaths.Count; i++)
            {
                TurnBMP(filePaths[i]);
            }

        }

        ///   
        /// 根据图片路径返回图片的字节流byte[]  
        ///   
        /// 图片路径  
        /// 返回的字节流  
        private static byte[] getImageByte(string imagePath)
        {
            FileStream files = new FileStream(imagePath, FileMode.Open);
            byte[] imgByte = new byte[files.Length];
            files.Read(imgByte, 0, imgByte.Length);
            files.Close();
            files.Dispose();
            return imgByte;
        }

        Bitmap bitmap = null;
        Bitmap bitmap2 = null;
        //图片另存成1位的BMP格式（单色图，只有黑白两个颜色）内有两种方法，都可以
        void TurnBMP(string texturePath)
        {
            //FileStream fs = new FileStream(texturePath, FileMode.Open, FileAccess.Read, FileShare.Read);
            //byte[] buffer = new byte[fs.Length];
            //int length = 0;
            //int ibyteRead = 0;
            //do
            //{
            //    length = fs.Read(buffer, ibyteRead, buffer.Length - ibyteRead);
            //    ibyteRead += length;
            //}
            //while (length > 0);
            //MemoryStream mfs = new MemoryStream(buffer);
            //fs.Close();
            //fs.Dispose();
            //Image bmp1 = Image.FromStream(mfs);
            //string _path;
            //int _index = texturePath.IndexOf(".");
            //string _str = texturePath.Substring(0, _index + 1);
            //_path = _str + ".bmp";
            //bmp1.Save(_path, ImageFormat.Bmp);
            //ljz添加
            bitmap2 = bitmap.Clone(new Rectangle(0, 0, bmp1.Width, bitmap.Height), PixelFormat.Format1bppIndexed);//重点在于Clone，获得原bitmap副本就可以设置PixcelFormat了，要注意矩形大小不能超过原Bitmap
            bitmap2.Save(_path, ImageFormat.Bmp);
            bitmap2.Dispose();
            //bmp1.Dispose();
            //mfs.Close();
            //mfs.Dispose();
            //
            //Console.Write("ok");
            //bitmap = new Bitmap(texturePath);
            //BitmapData data = bitmap.LockBits(new Rectangle(0, 0, bitmap.Width, bitmap.Height), ImageLockMode.ReadOnly, PixelFormat.Format1bppIndexed);
            //bitmap2 = new Bitmap(bitmap.Width, bitmap.Height, data.Stride, PixelFormat.Format1bppIndexed, data.Scan0);
            //string _path;
            //int _index = texturePath.IndexOf(".");
            //string _str = texturePath.Substring(0, _index + 1);
            //_path = _str + ".bmp";
            //bitmap2.Save(_path, ImageFormat.Bmp);
            //bitmap.UnlockBits(data);

            //
            string _path;
            int _index = texturePath.IndexOf(".");
            string _str = texturePath.Substring(0, _index);
            _path = _str + ".bmp";
            if (File.Exists(_path))
                File.Delete(_path);

            bitmap = new Bitmap(texturePath);
            bitmap2 = bitmap.Clone(new Rectangle(0, 0, bitmap.Width, bitmap.Height), PixelFormat.Format1bppIndexed);//重点在于Clone，获得原bitmap副本就可以设置PixcelFormat了，要注意矩形大小不能超过原Bitmap

            bitmap2.Save(_path, ImageFormat.Bmp);
            if (bitmap != null)
            {
                bitmap.Dispose();
            }
            if (bitmap2 != null)
            {
                bitmap2.Dispose();
            }
            

            //创建一个bitmap类型的bmp变量来读取文件。
            Bitmap bmp = new Bitmap(texturePath);
            //using (Bitmap bmp = new Bitmap(texturePath), bmp2 = new Bitmap(bmp.Width, bmp.Height, PixelFormat.Format1bppIndexed))
            //{
            //    新建第二个bitmap类型的bmp2变量，我这里是根据我的程序需要设置的。
            //    //Bitmap bmp2 = new Bitmap(bmp.Width, bmp.Height, PixelFormat.Format1bppIndexed);
            //    //将第一个bmp拷贝到bmp2中
            //    Graphics draw = Graphics.FromImage(bmp);
            //    draw.DrawImage(bmp2, 0, 0);
            //    string _path;
            //    int _index = texturePath.IndexOf(".");
            //    string _str = texturePath.Substring(0, _index + 1);
            //    _path = _str + ".bmp";
            //    bmp2.Save(_path, ImageFormat.Bmp);
            //    draw.Dispose();
            //    //bmp.Dispose();//释放bmp文件资源
            //}

            
            //创建一个bitmap类型的bmp变量来读取文件。
            //Bitmap bmp = new Bitmap(texturePath);
            新建第二个bitmap类型的bmp2变量，我这里是根据我的程序需要设置的。
            //Bitmap bmp2 = new Bitmap(1024, 768, PixelFormat.Format1bppIndexed);
            将第一个bmp拷贝到bmp2中
            //Graphics draw = Graphics.FromImage(bmp2);
            //draw.DrawImage(bmp, 0, 0);
            //string _path;
            //int _index = texturePath.IndexOf(".");
            //string _str = texturePath.Substring(0, _index + 1);
            //_path = _str + ".bmp";
            bmp2.Save(_path, ImageFormat.Bmp);
            //draw.Dispose();
            //bmp.Dispose();//释放bmp文件资源
            //              //bmp2.Dispose();

            
            //创建一个bitmap类型的bmp变量来读取文件。
            //Bitmap bmp = new Bitmap(texturePath);
            //新建第二个bitmap类型的bmp2变量，我这里是根据我的程序需要设置的。
            //Bitmap bmp2 = new Bitmap(1024, 768, PixelFormat.Format16bppRgb555);
            //将第一个bmp拷贝到bmp2中
            //Graphics draw = Graphics.FromImage(bmp2);
            draw.DrawImage(bmp, 0, 0);
            //bmp2.Save(_path, ImageFormat.Bmp);
            //draw.Dispose();
            //bmp.Dispose();//释放bmp文件资源
            //bmp2.Dispose();
            /


            //Image img = Image.FromFile(texturePath);
            //Bitmap bm = new Bitmap(img.Width, img.Height,PixelFormat.Format1bppIndexed);
            //Graphics g = Graphics.FromImage(bm);
            //g.Clear(Color.Transparent);
            //g.DrawImage(img, 0, 0);
            //img.Dispose();
            File.Delete(path);
            //string _path;
            //int _index = texturePath.IndexOf(".");
            //string _str = texturePath.Substring(0, _index + 1);
            //_path = _str + ".bmp";
            //bm.Save(_path, System.Drawing.Imaging.ImageFormat.Bmp);//把jpg转成bmp
            //g.Dispose();
            //bm.Dispose();
            //
            //try
            //{
            //    FileStream files = new FileStream(texturePath, FileMode.Open);
            //    Bitmap bmp2 = new Bitmap(files);

            //    string _path;
            //    int _index = texturePath.IndexOf(".");
            //    string _str = texturePath.Substring(0, _index + 1);
            //    _path = _str + ".bmp";
            //    bmp2.Save(_path, ImageFormat.Bmp);
            //    bmp2.Dispose();
            //    files.Close();
            //    files.Dispose();
            //}
            //catch (Exception ex)
            //{
            //    MessageBox.Show(ex.ToString());
            //    Console.WriteLine(ex.ToString());
            //}

        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void button2_Click(object sender, EventArgs e)
        {
            load();
            CompressTest();
        }
    }
}