Byte[]、Image、Bitmap 之间的相互转换

最新推荐文章于 2025-07-25 15:00:38 发布

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最新推荐文章于 2025-07-25 15:00:38 发布

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分类专栏： .net 文章标签： .net .NET .Net

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本文详细介绍了图像与位图之间的转换方法，包括将图片转换为字节数组，将字节数组转换回图片，以及将位图转换为图片和从图片转换为位图的过程。这些方法对于图像处理和开发具有重要意义。

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        public static byte[] ImageToBytes(Image Image, ImageFormat imageFormat)
        {

            if (Image == null) { return null; }

            byte[] data =null;

            using (MemoryStream ms= new MemoryStream())
            {
                 using (Bitmap Bitmap = new Bitmap(Image))
                {
                    Bitmap.Save(ms, imageFormat);
                    ms.Position = 0;
                    data = new byte[ms.Length];
                    ms.Read(data, 0, Convert.ToInt32(ms.Length));
                    ms.Flush();
                }
            }
            return data;
        }

            /// <summary>
            /// byte[]转换成Image
            /// </summary>
            /// <param name="byteArrayIn">二进制图片流</param>
            /// <returns>Image</returns>
            public static System.Drawing.Image byteArrayToImage(byte[] byteArrayIn)
            {
                if (byteArrayIn == null)
                    return null;
                using (System.IO.MemoryStream ms = new System.IO.MemoryStream(byteArrayIn))
                {
                    System.Drawing.Image returnImage = System.Drawing.Image.FromStream(ms);
                    ms.Flush();
                    return returnImage;
                }
            }

//Image转换Bitmap

1. Bitmap img = new Bitmap(imgSelect.Image);

2. Bitmap bmp = (Bitmap)pictureBox1.Image;

//Bitmap转换成Image

using System.IO;

       private static Image Bitmap2Image(System.Drawing.Bitmap Bi)
        {
            Image Result = null;
            try
            {
                using (MemoryStream ms = new MemoryStream())
                {
                    Bi.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
                    Result = Image.FromStream(ms);
                }
            }
            catch (Exception) { throw; }

            return Result;
        }

//byte[] 转换 Bitmap
public static Bitmap BytesToBitmap(byte[] Bytes)
        {
            MemoryStream stream = null;
            try
            {
                stream = new MemoryStream(Bytes);
                return new Bitmap((Image)new Bitmap(stream));
            }
            catch (ArgumentNullException ex)
            {
                throw ex;
            }
            catch (ArgumentException ex)
            {
                throw ex;
            }
            finally
            {
                stream.Close();
            }
        }

//Bitmap转byte[]
        public static byte[] BitmapToBytes(Bitmap Bitmap)
        {
            MemoryStream ms = null;
            try
            {
                ms = new MemoryStream();
                Bitmap.Save(ms, Bitmap.RawFormat);
                byte[] byteImage = new Byte[ms.Length];
                byteImage = ms.ToArray();
                return byteImage;
            }
            catch (ArgumentNullException ex)
            {
                throw ex;
            }
            finally
            {
                ms.Close();
            }
        }
    }