C# 如何存储数据库中的特定值并保存到cookie中

使用

SqlCommand.ExecuteScalar

从数据库中获取单个值，并将其添加到

Response.Cookies

SqlCommand cmd = new SqlCommand("select folderlocation from fsfilestorage 
                                 where id='"+sessionid+"'", con);
SqlDataReader reader1 = cmd.ExecuteReader();
reader1.Read();
string folder = string.Empty;
folder = reader1.GetString(0);

-您不应该将SQL语句连接在一起，而应该使用参数化查询来避免SQL注入

var folder=cmd.ExecuteScalar().ToString();

HttpCookie myCookie = new HttpCookie("folder");
myCookie["FolderPath"] = folder;
myCookie.Expires = DateTime.Now.AddDays(1d);
Response.Cookies.Add(myCookie);