怎么将image 转换成byte[]?

[worldhj1]

MemoryStream buf = new MemoryStream((byte[])reader[0]);
Image image = Image.FromStream(buf, true);
pb.Image = image;
这个是将byte[]变image.
那如果我想反过来,怎么实现?谢谢

[worldhj1]

MemoryStream msbyte = new MemoryStream();
User_Photo.Save(msbyte, System.Drawing.Imaging.ImageFormat.Jpeg);

说我参数无效

User_Photo是从这里来的
MemoryStream MsPhoto = new MemoryStream((byte[])Sdr[5]);
Lstart.User_Photo1 = Image.FromStream(MsPhoto, true);

如果Lstart.User_Photo1=Image.FromFile("a.jpg");就对的。

[worldhj1]

[Quote=引用 11 楼 net5i 的回复:]
MemoryStream ms = new MemoryStream();
s.Save(ms);
ms.Read(a, 0, ms.Length);
ms.Dispose();

即可
[/Quote]
s.Save(ms); 参数写1个无效 不能转string...

[zjs1109]

            try
            {
                this.pictureBox1.Image = Image.FromStream(this.openFileImage.OpenFile());
                string strimg = openFileImage.FileName.ToString();
                FileStream fs = new FileStream(strimg, FileMode.Open, FileAccess.Read);
                BinaryReader br = new BinaryReader(fs);
                imgBytesIn = br.ReadBytes((int)fs.Length);
            }
            catch
            {
                MessageBox.Show("您选择的图片不能被读取或文件类型不对！", "错误", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                this.pictureBox1.Image = null;
            }

[net5i]

把字节写入到流MemaryStream memaryStream;
Image img = Image.FromStream(memaryStream);
就可以的

[长沙三毛]

            using(MemoryStream ms = new MemoryStream())
            {
                pictureBox1.Image.Save(ms, System.Drawing.Imaging.ImageFormat.Bmp);
                ms.Position = 0;
                byte[] imageBytes = new byte[ms.Length];
                ms.Read(imageBytes,0,imageBytes.Length);
            }

[net5i]

再写详细些吧：
MemoryStream ms = new MemoryStream();
ms.Write(bytes, 0, bytes.Length);
Image img = Image.FromStream(ms);
ms.Close();
ms.Dispose();

[bloodish]

            Image img;
            MemoryStream ms = new MemoryStream();
            img.Save(ms, ImageFormat.Bmp);
            byte[] bytes = ms.GetBuffer();

[net5i]

噢，搂主是想反过来？
那么，2楼正解，可以参考

[wuyq11]

public byte[] SetImage(SqlDataReader reader)
{
return (byte[])reader["Image"];//Image为数据库中存放Image类型字段
}

[Chawind]

MemoryStream ms=new MemoryStream ();//流
Image im=AddChart ();//添加的图片//保存要添加的图片//这里保存你的图片
im.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg );//把图片写入到流中
byte [] imge=ms.ToArray ();//用流写如byte树组

[worldhj1]

就是返回成byte[] 我要将它保存到数据库的image字段的。谢谢上面那么多人的回答.

[啊兵]

byte［］ img;
string strimg=openfileimage.filename.tostring();
filestream fs=new filestream(strimg,filemode.open,fileaccess.read);
binaryreader br=new binaryreader(fs);
img=br.readbytes((int)fs.length);

这里的img就是图片转成的byte

[worldhj1]

就是把 image s;
s 变成 byte[] a

怎么写/??

[net5i]

MemoryStream ms = new MemoryStream();
s.Save(ms);
ms.Read(a, 0, ms.Length);
ms.Dispose();

即可