做的留言板登陆界面，出现“System.Data.SqlClient.SqlConnection”不包含“ExecuteScalar”的定义
错误 1 “System.Data.SqlClient.SqlConnection”不包含“ExecuteScalar”的定义，并且找不到可接受类型为“System.Data.SqlClient.SqlConnection”的第一个参数的扩展方法“ExecuteScalar”(是否缺少 using 指令或程序集引用?) C:\Users\张小坨\Desktop\liuyanban\login.aspx.cs 39 22 C:\...\liuyanban\数据库名字message
有表：dbo.mes
dbo.user
ID user pwd name qq email interest type
1 1 111111 1 1 jyzgw789@163.com 1 1
using System;
using System.Configuration;
using System.Collections;
using System.Data;
//using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
//using System.Xml.Linq;
using System.Data.SqlClient;
public partial class login : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
Response.Redirect("zhuce.aspx");
}
protected void Button2_Click(object sender, EventArgs e)
{
string name = text_user.Text;
string pwd = text_pwd.Text;
SqlConnection conn = new SqlConnection();
conn.ConnectionString = "server=ABD\\SQLEXPRESS;DataBase=message;Integrated Security=SSPI";
conn.Open();
string sqlstr = "select count(*)from user_user where user='" + name + "'and pwd='" + pwd + "'";
SqlCommand comm = new SqlCommand(sqlstr, conn);
int i = Convert.ToInt32(conn.ExecuteScalar());
conn.Close();
if (i > 0)
{
Response.Redirect("liuyanban.aspx");
}
else
this.Label4.Text = "登陆失败，用户名或密码错误！请重试。";
// Response.Redirect("liuyanban.aspx");
}
}
--------------------编程问答-------------------- 是comm.ExecuteScalar --------------------编程问答--------------------
好了，可是出现这个：
protected void Button2_Click(object sender, EventArgs e)
{
string name = text_user.Text;
string pwd = text_pwd.Text;
SqlConnection conn = new SqlConnection();
conn.ConnectionString = "server=ABD\\SQLEXPRESS;DataBase=message;Integrated Security=SSPI";
conn.Open();
string sqlstr = "select count(*)from user_user where user='" + name + "'and pwd='" + pwd + "'";
SqlCommand comm = new SqlCommand(sqlstr, conn);
int i = Convert.ToInt32(conn.ExecuteScalar()); conn.Close();
if (i > 0)
{
Response.Redirect("liuyanban.aspx");
}
else
this.Label4.Text = "登陆失败，用户名或密码错误！请重试。";
// Response.Redirect("liuyanban.aspx");
}
说用户代码未处理SqlException
关键字‘user’附近有语法错误
--------------------编程问答--------------------
using(SqlConnection conn = new SqlConnection(""))
{
conn.Open();
SqlCommand comm = new SqlCommand("select count(8) from ....", conn);
nt iCount = (int) comm.ExecuteScalar();
} --------------------编程问答-------------------- string sqlstr = "select count(*) from user_user where [user]='" + name + "' and pwd='" + pwd + "'";
--------------------编程问答-------------------- string sqlstr = "select count(*)from user_user where user='" + name + "'and pwd='" + pwd + "'";
你的数据库表名不是user 吗 --------------------编程问答-------------------- user 是保留字，如果用于字段名需要用中括号包起来，[user] --------------------编程问答--------------------
正解,另外参数最好可以用"@参数名"这样的来代替,避免受到攻击.
补充：.NET技术 , C#
