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打开文件，并返回文件路径

public string OpenFile(string strFilter)        {
               string strFileName = string.Empty;            OpenFileDialog openFile = new OpenFileDialog();            openFile.Filter = strFilter;            openFile.FilterIndex = 1;            if (openFile.ShowDialog() == DialogResult.OK)            {
                   strFileName = openFile.FileName;            }            return strFileName;        }

导出图片

public void ExportPic(PictureBox picBox)        {
               SaveFileDialog saveFile = new SaveFileDialog();            saveFile.Filter = "图像文件(*.PNG)|*.PNG|所有文件(*.*)|*.*";            if (saveFile.ShowDialog() == DialogResult.OK)            {
                   string fileName = saveFile.FileName;                string strExtension = Path.GetExtension(fileName);                switch (strExtension)                {
                       case ".png":                        picBox.Image.Save(fileName, System.Drawing.Imaging.ImageFormat.Png);                        break;                    case ".PNG":                        picBox.Image.Save(fileName, System.Drawing.Imaging.ImageFormat.Png);                        break;                    case ".jpg":                        picBox.Image.Save(fileName, System.Drawing.Imaging.ImageFormat.Jpeg);                        break;                    case ".jpeg":                        picBox.Image.Save(fileName, System.Drawing.Imaging.ImageFormat.Jpeg);                        break;                    default:                        break;                }            }        }

将文件转换为二进制

public byte[] FileToBytes(string filePath)        {
               FileInfo fileInfo = new FileInfo(filePath);            byte[] buffer = new byte[fileInfo.Length];            FileStream fs = fileInfo.OpenRead();            fs.Read(buffer, 0, Convert.ToInt32(fileInfo.Length));            fs.Close();            return buffer;        }

将给定二进制流写入一个新文件

public void CreateFile(byte[] fileBuffer,string newFilePath)        {
               if (File.Exists(newFilePath))            {
                   File.Delete(newFilePath);            }            FileStream fs = new FileStream(newFilePath, FileMode.CreateNew);            BinaryWriter bw = new BinaryWriter(fs);            bw.Write(fileBuffer, 0, fileBuffer.Length);            bw.Close();            fs.Close();        }

字节转图像

public Image Bytes2Img(byte[] buffer)        {
               MemoryStream ms = new MemoryStream(buffer);            ms.Position = 0;            Image img = Image.FromStream(ms);            ms.Close();            return img;        }

图片转字节

public byte[] Img2Bytes(Image img)        {
               byte[] bytes = null;            MemoryStream ms = new MemoryStream();            img.Save(ms, ImageFormat.Png);            bytes = ms.GetBuffer();            ms.Close();            return bytes;        }

从图片文件路径转字节

public byte[] ImgFile2Bytes(string strPicFile)        {
               if (string.IsNullOrEmpty(strPicFile)) return null;            byte[] bytes = null;            MemoryStream ms = new MemoryStream();            Image img = Image.FromFile(strPicFile);            img.Save(ms, ImageFormat.Png);            bytes = ms.GetBuffer();            ms.Close();            return bytes;        }

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