asp.net 显示二进制图片

源页面代码：a.aspx 后台代码为： img.ImageUrl = "b.aspx?ImgID=" + 1; 显示图片页面 b.aspx 后台代码： object s = Request.QueryString["ImgID"]; //; if (s != null) { string connectionString = ConfigurationSettings.AppSettings["SQLConnectionStr"]; using (SqlConnection myConnection = new SqlConnection(connectionString)) { SqlCommand myCommand = new SqlCommand("Select drawing from DAT_ITEM_master Where item_uid=" + s.ToString(), myConnection); try { myConnection.Open(); SqlDataReader myDataReader; myDataReader = myCommand.ExecuteReader(); if (myDataReader.Read()) { if (myDataReader["drawing"] is DBNull) return; Response.Clear(); Response.ContentType = "application/octet-stream"; Response.BinaryWrite((byte[])myDataReader["drawing"]); } } catch (SqlException SQLexc) { Response.Write(SQLexc.ToString()); } } } }