Webform 内置对象 Response对象、Request对象，QueryString

时间 2019-12-08

标签 webform 内置对象 response request querystring 繁體版

原文原文链接

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：不须要保密的东西能够传
不要传过长东西，由于长度有限，过长会形成数据丢失javascript

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

对数据表的增删改：java

Default.aspx中添加用户数据库

 <input id="btn1" type="button" value="添加用户" />

        <script>
            document.getElementById("btn1").onclick = function () {
                window.open("Default3.aspx", "_self");
            };

        </script>

首先数据访问类造一个添加方法this

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;
    }

添加：spa

<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="true" Selected="True">男</asp:ListItem>
            <asp:ListItem Value="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code

<script type="text/javascript">
        window.onload = function () {/*document操做取出密码框里内容*/
            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，同样就刷新*/
                }
            };
        };

    </script>

    <style type="text/css">
        #Label2 {
        
        color:red;/*Label2里所呈现的文字显示红色*/
        }

    </style>
</head>

性别默认选中，生日需三个DropDownListorm

<asp:ListItem Value="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++)
            {
                //月
                ListItem li = new ListItem(i.ToString(), i.ToString());
                DropDownList3.Items.Add(li);
            }

            for (int i = 1; i <= 31; i++)
            {
                //日
                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)
{
//一、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;server

//二、将此对象添加到数据库去
bool ok = new UsersData().Insert(u);对象

//三、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>");
}

//四、关闭此页面，刷新展现页面
}
}

2、删除

操做，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>操做</td>

   <td><a href="delete.aspx"?un=<%#Eval("UserName")

>删除</a></td>

//新网页中执行的删除代码
//一、获取要删除的主键值，username,作删除的方法
        string Uname = Request["un"].ToString(); 获取请求

        //二、删除
        new UsersDA().Delete(Uname);
        //三、调回Main页面
        Response.Redirect("Main.aspx");

3、修改

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

数据操做类添加方法：

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 = 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、提示修改为功
        if (ok)
        {
            Response.Write("<script>alert('修改为功！')</script>");
          4步、Response.Write("<script>this.opener.location.href='Main.aspx';this.close();</script>");
            //Response.Redirect("Main.aspx");//重定项

        }
        else
        {
            Response.Write("<script>alert('修改失败！')</script>");
        }
        //四、关闭此页面，刷新展现页面
        //用JS写
    }
}