图片与二进制流转换

#region//图片转换为二进制流
public void PictureToBinaryStream()
{
    //获取当前程序运行路径
    string path = Application.StartupPath;
    //拼接成测试图片路径
    string fullPath = path + "\images\test.png";
    //初始化类
    Bitmap bmp = new Bitmap(Image.FromFile(fullPath));
    MemoryStream ms = new MemoryStream();
    bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
    ms.Flush();
    //将二进制数据存到byte数字中
    byte[] bmpBytes = ms.ToArray();
    // richTextBox1.Text = Convert.ToBase64String(bmpBytes);
    foreach (var item in bmpBytes)
    {
        richTextBox1.Text += item;
    }
    pictureBox1.Image = Image.FromStream(new MemoryStream(bmpBytes));
}
#endregion

#region//二进制流转换成图片
public void BinaryStreamToPicture()
{
    string url = @"http://php.weather.sina.com.cn/images/yb3/78_78/duoyun_0.png";
    WebClient client = new WebClient();
    byte[] pageData = client.DownloadData(url);
    //将二进制流数据转换为图片
    pictureBox1.Image = Image.FromStream(new MemoryStream(pageData));
    Bitmap bmp = new Bitmap(new MemoryStream(pageData));
    string path = Application.StartupPath;
    string fullPath = path + "\images\"+ Guid.NewGuid().ToString()+".png";
    richTextBox1.Text = fullPath;
    bmp.Save(fullPath, System.Drawing.Imaging.ImageFormat.Png);
}
#endregion