img的导出与写入SQL

读取数据库

cmd.CommandText="";
adp.SelectCommand=cmd;
adp.Fill(dt);
byte[] imagebytes=(byte[]) dt.Rows[0][0];
MemoryStream ms=new MemoryStream(imagebytes);
Bitmap image=new Bipmap(ms);
PictureBox.image=image;

写入

FileStream fs=new FileStream(filepath, FileMode.Open, FileAccess.Read);
//byte[] image=new bt[fs.length];
//fs.readbyte(image,0,convert.toinv32(fs.length));
BinaryReader br=new BinaryReader(fs);
byte[] image=br.readbytes(fs.length);
cmd.CommandText="insert into 表名(列名)values(@image)"; 
7 cmd.Parameters.Add("image",SqldbType.Image);
8 cmd.Paramenters["image"].Value=image;
cmd.ExecuteNonQuery();