把图片保存进数据库了怎么读不出来啊，总是提示参数错误。。
读取：
string com = "select image from ServerList where ServerNumber='P800002'";
SqlConnection con = Link.linkCon();//自定义的
con.Open();
SqlCommand cmd = new SqlCommand(com, con);
SqlDataReader sdr = cmd.ExecuteReader();
sdr.Read();
MessageBox.Show(sdr[0].ToString());
byte[] bs = (byte[])sdr[0];
MemoryStream ms = new MemoryStream(bs);
ms.Write(bs, 0, bs.Length);
Image image = Image.FromStream(ms);
// Bitmap bt = new Bitmap(ms);//也行不通
pictureBox1.Image = image;
ms.Close();
con.Close(); 数据库 image byte
[解决办法]

引用:

引用:MemoryStream ms = new MemoryStream(bs);
ms.Write(bs, 0, bs.Length);

如果你的图片数据是正确的话，这两句有一句就够了。怎么判断图片数据是否正确呢，
存储代码
Image image = pictureBox1.Image;
……

SqlCommand com = new SqlCommand("update ServerList set [image]=@img where ServerNumber='P800002'", conn);
com.Parameters.Add(new SqlParameter("@img", bt));
com.ExecuteNonQuery();