asp.net中的User类

Question

 User user=(User)Session["current_user"];
中的USER类出错,要引入那个类库才行呀!
我的类库有:
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
using System.Web.SessionState;
using System.IO;

Answer 1

string user=Session["current_user"];
这样不行吗?

Answer 2

string user=Session["current_user"]; 
这样不行吗?

Answer 3

Microsoft.Office.InfoPath
是这个吗？
查下MSDN User类
不知道你说的是哪个

Answer 4

我试过string user=Session["current_user"]; 
但后面要用到user.ID就不行了

Answer 5

上下文...谁知道你这个User是从哪儿钻出来的...

Answer 6

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
using System.Web.SessionState;
using System.IO;
using System.ComponentModel;public partial class 留言板_sendMessage : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {    }
    protected void AddBtn_Click(object sender, EventArgs e)
    {
        string content = this.contentTxt.Text;
        string EMail=this.E_mailTxt.Text;
        string mg_sender="";
        User user=(User)Session["current_user"];
        if (user != null)
        {
            mg_sender = user.ID;
            this.receiveTxt.Text = mg_sender;
        }
        else
        {
            mg_sender = this.receiveTxt.Text;
        }
        if (mg_sender == "")
        {
            Response.Write("<script>alert(\"请输入发信人\")</script>");
            return;
        }
        //以上判断用户输入的数据,如果用户输入的数据正确,则发送消息
        if (validate(mg_sender))
        {
            DateTime time = DateTime.Now;
            if (send(mg_sender, content, time.ToString(), EMail)) Response.Write("<script>alert(\"发布成功\")</script>");
        }
        else        {
            Response.Write("<script>alert(\"发信人还没有注册!\")</script>");
            return;
        }    }
    private bool validate(string account)
    {
        string connectionString = System.Configuration.ConfigurationManager.AppSettings["ConnectionString"];
        SqlConnection conn = null;
        try
        {
            DataSet ds = new DataSet();
            //创建数据库链接,并打开此链接
            conn=new SqlConnection (connectionString);
            conn.Open();
            SqlCommand cmd=new SqlCommand();
            cmd.CommandText="select * from Users where id=@id";
            cmd.Connection=conn;
           SqlDataAdapter  adapter=new SqlDataAdapter ();
           adapter.SelectCommand=cmd;
            adapter.SelectCommand.Parameters.Add("@id",SqlDbType.Int).Value=account;
            adapter.Fill(ds);
            if(ds.Tables[0].Rows.Count>0)
            {
                return true;            }
            else
            {
                return false;
            }        }
        catch(SqlException ex)
        {
            throw ex;
            return false;
        }
        finally
        {
            try 
            {
                if(conn !=null) conn.Close();
            }
            catch(SqlException ex)
            {
                Response.Write("<script>alert(\"数据库错误\""+ex.Message+")</script>");
            }
        }
    }
    private bool send(string sender, string content, string time, string Email)
    {
        string connectionString = System.Configuration.ConfigurationManager.AppSettings["ConnectionString"];
        SqlConnection conn = null;
        try
        {
            DataSet ds = new DataSet();
            //  创建数据库链接,并打开此链接
            conn = new SqlConnection(connectionString);
            conn.Open();
            SqlCommand cmd = new SqlCommand();
            cmd.CommandText = "insert into Message(text,sender,E-mail,send_time) values('" + content + "','" + sender + "','" + Email + "','" + time + "')";
            cmd.Connection = conn;
            SqlDataAdapter adapter = new SqlDataAdapter();
            adapter.InsertCommand = cmd;
            return true;
        }
        catch (SqlException ex)
        {
            Response.Write("<script>alert(\"数据库错误\"" + ex.Message + ")</script>");
            return false;
        }
        finally
        {
            try
            {
                if (conn != null) conn.Close();
            }
            catch(SqlException ex)
            {
                Response.Write("<script>alert(\"数据库错误\"" + ex.Message + ")</script>");
                
            }
        }    }
}