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WebForm 内置对象

内置对象:

Response对象:响应请求
Response.Write("<script>alert(‘添加成功!‘)</script>");
Response.Redirect("Default.aspx");

Request对象:获取请求
Request["key"]来获取传递过来的值

QueryString:地址栏数据传递 ?key=value&key=value
注意事项:不需要保密的东西可以传
不要传过长东西,因为长度有限,过长会造成数据丢失

 

增删改查

 

添加用户

<input id="btn1" type="button" value=http://www.mamicode.com/"添加用户" />        <script>            document.getElementById("btn1").onclick = function () {                window.open("Default3.aspx", "_self");            };        </script>
public bool Insert(Users u){//添加bool isok = false;cmd.CommandText = "insert into Users values(@a,@b,@c,@d,@e,@f)";cmd.Parameters.Clear();cmd.Parameters.Add("@a", u.UserName);cmd.Parameters.Add("@b", u.PassWord);cmd.Parameters.Add("@c", u.NickName);cmd.Parameters.Add("@d", u.Sex);cmd.Parameters.Add("@e", u.Birthday);cmd.Parameters.Add("@f", u.Nation);conn.Open();try{cmd.ExecuteNonQuery();isok = true;}catch { }conn.Close();return isok;}
<body>    <form id="form1" runat="server">        <h1>用户添加</h1>    用户名:<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox><br /><br />                密码:<asp:TextBox ID="TextBox3" runat="server" TextMode="Password"></asp:TextBox><br /><br />        确认密码:<asp:TextBox ID="TextBox4" runat="server" TextMode="Password"></asp:TextBox><br /><br />        昵称:<asp:TextBox ID="TextBox6" runat="server"></asp:TextBox><br /><br />        性别:<asp:RadioButtonList ID="RadioButtonList1" runat="server" RepeatDirection="Horizontal" RepeatLayout="Flow">            <asp:ListItem Value=http://www.mamicode.com/"true" Selected="True">男</asp:ListItem>            <asp:ListItem Value=http://www.mamicode.com/"false">女</asp:ListItem>        </asp:RadioButtonList><br /><br />        生日:<asp:DropDownList ID="DropDownList2" runat="server"></asp:DropDownList>年<asp:DropDownList ID="DropDownList3" runat="server"></asp:DropDownList>月<asp:DropDownList ID="DropDownList4" runat="server"></asp:DropDownList>日<br /><br />        民族:<asp:DropDownList ID="DropDownList1" runat="server" Width="122px"></asp:DropDownList><br /><br />       &nbsp &nbsp &nbsp &nbsp <asp:Button ID="Button1" runat="server" Text="注 册" /><br />        <asp:Label ID="Label1" runat="server" Text=""></asp:Label>                </form></body>

密码JS验证

<script type="text/javascript">        window.onload = function () {/*document操作取出密码框里内容*/            document.getElementById("Button1").onclick = function () {                var pwd1 = document.getElementById("TextBox3").value;                var pwd2 = document.getElementById("TextBox4").value;               /* alert(pwd1);检测一下*/               /* alert(pwd2);*/                if (pwd1 != pwd2) {                    document.getElementById("Label2").innerText = "两次密码输入不一致";                    return false;/*密码不一阻止刷新,一样就刷新*/                }            };        };    </script>    <style type="text/css">        #Label2 {                color:red;/*Label2里所呈现的文字显示红色*/        }    </style></head>

默认性别,做三个DropDownList

<asp:ListItem Value=http://www.mamicode.com/"true" Selected="True">男</asp:ListItem>

 


protected
void Page_Load(object sender, EventArgs e) { if (!IsPostBack)//数据绑定 { for (int i = DateTime.Now.Year; i >= 1900; i--) { //添加年 ListItem li = new ListItem(i.ToString(),i.ToString()); DropDownList2.Items.Add(li); } for (int i = 1; i <= 12; i++) { // ListItem li = new ListItem(i.ToString(), i.ToString()); DropDownList3.Items.Add(li); } for (int i = 1; i <= 31; i++) { // ListItem li = new ListItem(i.ToString(), i.ToString()); DropDownList4.Items.Add(li); } //取出民族的数据 DropDownList1.DataSource = new NationDA().Select(); DropDownList1.DataTextField = "NationName"; DropDownList1.DataValueField = "NationCode"; DropDownList1.DataBind(); } Button1.Click += Button1_Click;//事件委托 }void Button1_Click(object sender, EventArgs e){//1、构建一个Users对象Users u = new Users();u.UserName = TextBox1.Text;u.PassWord = TextBox3.Text;u.NickName = TextBox4.Text;u.Sex = Convert.ToBoolean(RadioButtonList1.SelectedItem.Value);string date = DropDownList1.SelectedValue + "-" + DropDownList2.SelectedValue + "-" + DropDownList3.SelectedValue;u.Birthday = Convert.ToDateTime(date);u.Nation = DropDownList4.SelectedItem.Value;//2、将此对象添加到数据库去bool ok = new UsersData().Insert(u);//3、提示添加成功if (ok){Response.Write("<script>alert(‘添加成功!‘)</script>");Response.Redirect("Default.aspx");}else{Response.Write("<script>alert(‘添加失败!‘)</script>");}//4、关闭此页面,刷新展示页面}}

删除

操作,在default.aspx主页数据显示中添加一列,点删除,打开新的网页delete.aspx执行代码后关闭,刷新主页面

<td>操作</td>   <td><a href=http://www.mamicode.com/"delete.aspx"?un=<%#Eval("UserName")>删除</a></td>
//新网页中执行的删除代码//1、获取要删除的主键值,username,做删除的方法        string Uname = Request["un"].ToString(); 获取请求        //2、删除        new UsersDA().Delete(Uname);        //3、调回Main页面        Response.Redirect("Main.aspx");

修改

新建窗体xiugai.aspx  数据展示页面添加一列修改,点击进入xiugai.aspx

<td><a href="http://www.mamicode.com/#">修改</a></td>

数据操作类添加方法:

public bool Update(Users u)    {        bool isok = false;        cmd.CommandText = "update Users set PassWord=@b,NickName=@c,Sex=@d,Birthday=@e,Nation=@f where UserName=@a";        cmd.Parameters.Clear();        cmd.Parameters.Add("@a", u.UserName);        cmd.Parameters.Add("@b", u.PassWord);        cmd.Parameters.Add("@c", u.NickName);        cmd.Parameters.Add("@d", u.Sex);        cmd.Parameters.Add("@e", u.Birthday);        cmd.Parameters.Add("@f", u.Nation);        conn.Open();        try        {            cmd.ExecuteNonQuery();            isok = true;        }        catch { }        conn.Close();        return isok;    }
//1步、构建一个Users对象        Users u = new Users();        u.UserName = Label1.Text;        if (TextBox3.Text == "" && TextBox4.Text == "")        {//判断密码的            u.PassWord = pwd;        }        else        {            u.PassWord = TextBox3.Text;        }        u.NickName = TextBox6.Text;        u.Sex = Convert.ToBoolean(RadioButtonList1.SelectedItem.Value);        string data = http://www.mamicode.com/DropDownList2.SelectedValue + "-" + DropDownList3.SelectedValue + "-" + DropDownList4.SelectedValue;        u.Birthday = Convert.ToDateTime(data);        u.Nation = DropDownList1.SelectedItem.Value;        //2步、将此对象添加到数据库去,先在UserDA里修改方法        bool ok = new UsersDA().Update(u);        //3步、提示修改成功        if (ok)        {            Response.Write("<script>alert(‘修改成功!‘)</script>");          4步、Response.Write("<script>this.opener.location.href=http://www.mamicode.com/‘Main.aspx‘;this.close();</script>");            //Response.Redirect("Main.aspx");//重定项        }        else        {            Response.Write("<script>alert(‘修改失败!‘)</script>");        }        //4、关闭此页面,刷新展示页面        //用JS写    }}

Cookies

做一个登陆界面

<form id="form1" runat="server">    用户名:<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox><br />        密码:<asp:TextBox ID="TextBox2" runat="server"></asp:TextBox><br />        <asp:CheckBox ID="CheckBox1" runat="server" /><label for="CheckBox1">记住登陆状态7天</label><br />        <asp:Button ID="Button1" runat="server" Text="登陆" />    </form>

点击事件

protected void Page_Load(object sender, EventArgs e)    {        Button1.Click += Button1_Click;    }    void Button1_Click(object sender, EventArgs e)    {        bool ok = new UsersData().Select(TextBox1.Text, TextBox2.Text);        if (ok)        {            Response.Cookies["user"].Value =http://www.mamicode.com/ TextBox1.Text;            if (CheckBox1.Checked)            {                Response.Cookies["user"].Expires = DateTime.Now.AddDays(7);            }            Response.Redirect("Default.aspx");        }    }

登陆状态保持:
Cookies

在用户电脑的硬盘上保存的一段文本

http协议包括浏览器,允许站点在用户电脑上以Cookies的形式来临时保存数据

如果没有设置保存时间,会话cookies
1、如果你20分钟内没有再次刷新页面,那么此cookies就会自动删除掉
2、当当前访问连接中断,如关闭浏览器,那么cookies会自动删除

作用:
保持用户的登陆状态

WebForm 内置对象