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[ASP.net教程]Webform 内置对象(Response对象、Request对象,QueryString)


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

 

对数据表的增删改:

Default.aspx中添加用户

 <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

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:

<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

<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>

 

 

性别默认选中,生日需三个DropDownList

<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)
{
//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
}
}

 

二、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="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");

三、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="#">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 = 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='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  }}