从数据库中读取文件

从数据库中读取文件

< h3 > 从数据库中读取文件 </ h3 >
            输入文件在数据库中的ID：
             < asp:textbox  id ="FileIDTextBox"  runat ="server" ></ asp:textbox >
             < asp:button  id ="SubmitBtn"  runat ="server"  Text ="显示"  OnClick ="SubmitBtn_Click" ></ asp:button >

 

             void  SubmitBtn_Click( object  sender, System.EventArgs e)
             {
                int FileID = Convert.ToInt32(FileIDTextBox.Text);

                string ConnStr = System.Configuration.ConfigurationSettings.AppSettings["ConnectionSqlServer"];
                string query = "SELECT * FROM FileTable WHERE FileID = @FileID";

                SqlCommand myCommand = new SqlCommand(query, new SqlConnection(ConnStr));
                myCommand.Parameters.Add("@FileID", SqlDbType.Int);
                myCommand.Parameters["@FileID"].Value = FileID;
                myCommand.Connection.Open();

                SqlDataReader dr = myCommand.ExecuteReader();

                if(dr.Read())
                {
                         Response.AddHeader("content-disposition","inline;filename=文件名.后缀名");
                    Response.ContentType = (string)dr["FileContentType"];//Response.ContentType = "byte[]";
                    Response.OutputStream.Write((byte[])dr["FileData"], 0, (int)dr["FileSize"]);
                       //Response.BinaryWrite((byte[])dr["FileData"]);
                }
                else
                {
                    Response.Write("没有这个文件的ID号");
                    Response.End();
                }

                dr.Close();
                myCommand.Connection.Close();
            }

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