file:///C:\Users\j\Desktop\WebSite\App_Code\Dao.cs

本文链接：https://blog.youkuaiyun.com/eds124/article/details/86546655

本文详细解析了在Web应用程序中，如何使用C#实现DAO层，包括文件 Dao.cs 的内容，讨论了其在数据访问和业务逻辑层交互中的关键作用，以及常见的设计模式和最佳实践。

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using System;
using System.Collections.Generic;
//using System.Linq;
using System.Web;

public class Dao
{
    private static string ConnectionString = "Data Source=.;Initial Catalog=mydata;User ID=sa;Password=Abcdefg1";

    public Dao()
    {

    }

    public static bool login(string username, string userpass)
    {
        bool b = false;
        using (System.Data.SqlClient.SqlConnection conn = new System.Data.SqlClient.SqlConnection(ConnectionString))
        {

            System.Data.SqlClient.SqlCommand comm = conn.CreateCommand();
            comm.CommandText = "select count(*) from t_user where username = @username and userpass = @userpass";
            comm.Parameters.AddWithValue("username", username);
            comm.Parameters.AddWithValue("userpass", userpass);
            conn.Open();
            object o = comm.ExecuteScalar();
            int i = Convert.ToInt32(o);
            if (i > 0)
            {
                b = true;
            }

        }
        return b;
    }

    public static void BangDingUser(System.Web.UI.WebControls.GridView gv)
    {
        using (System.Web.UI.WebControls.SqlDataSource sds = new System.Web.UI.WebControls.SqlDataSource(Dao.ConnectionString, "select * from t_user order by username asc"))
        {
            gv.DataSource = sds;
            gv.DataBind();
        }
    }

    public static void GridViewUser(System.Web.UI.WebControls.GridView gv)
    {
        gv.Caption = "用户表";
        gv.EmptyDataText = "用户表数据为空";
        gv.EmptyDataRowStyle.BackColor = System.Drawing.Color.Red;
        gv.GridLines = System.Web.UI.WebControls.GridLines.None;
        gv.AllowPaging = true;
        gv.HeaderStyle.BackColor = System.Drawing.Color.Gr