图片与Byte相互转换,文件和字节流的转换方法

///

        /// 文件转化成byte[]数组
        ///

        ///
        ///
        private byte[] FileContent(string fileName)
        {
            FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);
            try
            {
                byte[] buffur = new byte[fs.Length];
                fs.Read(buffur, 0, (int)fs.Length);
                return buffur;
            }
            catch (Exception ex)
            {
                //ex.Message
                return null;
            }
            finally
            {
                if (fs != null)
                {
                    fs.Close();
                }
            }
        }
        ///

        /// C#文件和字节流的转换方法
        ///

        ///
        ///
        ///
        public void FileFun(byte[] buffur,FileStream fs,string filename)
        {
            //将byte 保存为文件 转为文件
            using (fs = new FileStream("D://test.jpg", FileMode.Create, FileAccess.Write))
            {
                fs.Write(buffur, 0, buffur.Length);
            };
            fs.Close();
            //C#文件和字节流的转换方法
            //1、读取文件，并转换为字节流
            fs = new FileStream(filename,FileMode.Open,FileAccess.Read);
            byte[] infbytes = new byte[(int)fs.Length];
            fs.Read(infbytes, 0, infbytes.Length);
            fs.Close();
            //2、将字节流写入文件
            fs = new FileStream("D:\inf.dlv",FileMode.Create,FileAccess.Write);
            fs.Write(infbytes, 0, infbytes.Length);
            fs.Close();

        }
        //C# 图片与Byte相互转换
        ///

        /// 图片转byte
        ///

        ///
        ///
        private byte[] GetIMGbyte(string PicturePath)
        {
            //将需要存储的图片读取为数据流
            FileStream fs = new FileStream(@PicturePath, FileMode.Open, FileAccess.Read);
            Byte[] btye2 = new byte[fs.Length];
            fs.Read(btye2, 0, Convert.ToInt32(fs.Length));
            fs.Close();
            return btye2;
        }
        ///

        /// byte转图片
        ///

        ///
        ///
        public System.Drawing.Image ReturnPhoto(byte[] streamByte)
        {

            //将数据流读取为图片
            System.IO.MemoryStream ms = new System.IO.MemoryStream(streamByte);
            System.Drawing.Image img = System.Drawing.Image.FromStream(ms);
            return img;
        }
        ///

        /// 图片转byte
        ///

        ///
        ///
        public byte[] GetPictureData(string imagePath)
        {
            FileStream fs = new FileStream(imagePath, FileMode.Open);
            byte[] byteData = new byte[fs.Length];
            fs.Read(byteData, 0, byteData.Length);
            fs.Close();
            return byteData;
        }
         //将Image转换成流数据，并保存为byte[] 
        ///

        /// 图片转byte
        ///

        ///
        ///
        public byte[] PhotoImageInsert(System.Drawing.Image imgPhoto)
        {
            MemoryStream mstream = new MemoryStream();
            imgPhoto.Save(mstream, System.Drawing.Imaging.ImageFormat.Bmp);
            byte[] byData = new Byte[mstream.Length];
            mstream.Position = 0;
            mstream.Read(byData, 0, byData.Length); mstream.Close();
            return byData;
        }
        //图片的“写”操作
        //参数是Byte[]类型，返回值是Image对象
        ///

        /// byte转图片
        ///

        ///
        ///
        public System.Drawing.Image ReturnPhoto(byte[] streamByte)
        {
            System.IO.MemoryStream ms = new System.IO.MemoryStream(streamByte);
            System.Drawing.Image img = System.Drawing.Image.FromStream(ms);
            return img;
        }
        //参数是Byte[] 类型，没有返回值（ASP.NET输出图片）
        public void WritePhoto(byte[] streamByte)
        {
            // Response.ContentType 的默认值为默认值为“text/html”
            Response.ContentType = "image/GIF";
            //图片输出的类型有: image/GIF     image/JPEG
            Response.BinaryWrite(streamByte);
        }