byte[] image 互相转换

byte[] -> Image

if(null != this.emp.Emp_Photo)
{
    MemoryStream ms = new MemoryStream(this.emp.Emp_Photo);
    if(ms.Length > 0)
    {
        this.picUsrPhoto.Image = Image.FromStream(ms);
    }
    else
    {
        this.picUsrPhoto.Image = null;
    }
}

Image -> byte[]

Byte[] photo;
if(null != this.picUsrPhoto.Image)
{
    MemoryStream ms = new MemoryStream();
    this.picUsrPhoto.Image.Save(ms,System.Drawing.Imaging.ImageFormat.Jpeg);
    photo = new Byte[ms.Length];
    ms.Position = 0;
    ms.Read(photo,0,Convert.ToInt32(ms.Length));
}
this.emp.Emp_Photo = photo;