Chapter 2. ASP.NET 标准控件（单选、复选、列表、面板、日历）

<h2>单选和单选组控件：</h2><br />
        <asp:RadioButton ID="RadioButton1" runat="server" AutoPostBack="True" GroupName="gender" Text="男"/>
        &nbsp;
        <asp:RadioButton ID="RadioButton2" runat="server" AutoPostBack="true" GroupName="gender" Text="女"/>
        <br /><br />

        选择毕业院校：
        <asp:RadioButtonList ID="RadioButtonList1" runat="server" 　　　　　　　 AutoPostBack="True" OnSelectedIndexChanged="RadioButtonList1_SelectedIndexChanged">
            <asp:ListItem Value="1">天津大学</asp:ListItem>
            <asp:ListItem Value="2">南开大学</asp:ListItem>
            <asp:ListItem Value="3">天津外国语大学</asp:ListItem>
            <asp:ListItem Value="4">天津师范大学</asp:ListItem>
            <asp:ListItem Value="5">其他</asp:ListItem>
        </asp:RadioButtonList><br />
        <asp:Label ID="Label3" runat="server" Text="Label3"></asp:Label>

protected void RadioButtonList1_SelectedIndexChanged(object sender, EventArgs e)
    {
        Label3.Text = "您选择的是:"+
            RadioButtonList1.SelectedValue.ToString()+" "+RadioButtonList1.SelectedItem.ToString();
    }

<h2>复选框和复选组控件：</h2>
        <asp:CheckBox ID="CheckBox1" runat="server" AutoPostBack="True" Text="粗体" OnCheckedChanged="CheckBox1_CheckedChanged" />
        <asp:CheckBox ID="CheckBox2" runat="server" autopostback="True" Text="斜体" OnCheckedChanged="CheckBox2_CheckedChanged"/>
        <asp:CheckBox ID="CheckBox3" runat="server" AutoPostBack="true" Text="下划线" OnCheckedChanged="CheckBox3_CheckedChanged"/>
        &nbsp;&nbsp;
        <asp:Label ID="Label4" runat="server" Text="Label4"></asp:Label>
        <br /><br />
        <asp:CheckBoxList ID="CheckBoxList1" runat="server" AutoPostBack="True" OnSelectedIndexChanged="CheckBoxList1_SelectedIndexChanged" RepeatColumns="6" RepeatDirection="Horizontal">
            <asp:ListItem>体育</asp:ListItem>
            <asp:ListItem>电脑</asp:ListItem>
            <asp:ListItem>摄影</asp:ListItem>
            <asp:ListItem>音乐</asp:ListItem>
            <asp:ListItem>旅游</asp:ListItem>
            <asp:ListItem>其他</asp:ListItem>
        </asp:CheckBoxList>
        <asp:Label ID="Label5" runat="server" Text=""></asp:Label>
        

　　protected void CheckBox1_CheckedChanged(object sender, EventArgs e)
    {
        Label4.Font.Bold = !Label4.Font.Bold;
    }
    protected void CheckBox2_CheckedChanged(object sender, EventArgs e)
    {
        Label4.Font.Italic = !Label4.Font.Italic;
    }
    protected void CheckBox3_CheckedChanged(object sender, EventArgs e)
    {
        Label4.Font.Underline = !Label4.Font.Underline;
    }
    protected void CheckBoxList1_SelectedIndexChanged(object sender, EventArgs e)
    {
        for (int i = 0; i < CheckBoxList1.Items.Count; i++)
        {
            if (CheckBoxList1.Items[i].Selected == true)
            {
                Label5.Text += CheckBoxList1.Items[i].Text;
            }
        }
    }

<h2>列表控件：</h2>
        DropDownList:
        <asp:DropDownList ID="DropDownList1" runat="server"
            AutoPostBack="True"
            OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged">
            <asp:ListItem>北京</asp:ListItem>
            <asp:ListItem>天津</asp:ListItem>
            <asp:ListItem>上海</asp:ListItem>
            <asp:ListItem>重庆</asp:ListItem>
        </asp:DropDownList><br />
        SelectedItem:<asp:Label ID="Label6" runat="server" Text="Label"></asp:Label>
        &nbsp;
        SelectedValue:<asp:Label ID="Label7" runat="server" Text="Label"></asp:Label>
        <br />
        <asp:DropDownList ID="DropDownList2" runat="server" AutoPostBack="True"></asp:DropDownList>
        <br />
        <asp:Button ID="Button3" runat="server" Text="Add方法" OnClick="Button3_Click" />
        <asp:Button ID="Button4" runat="server" Text="Remove方法" OnClick="Button4_Click" />
        <br />
        ListBox:<br />
        <asp:ListBox ID="ListBox1" runat="server" SelectionMode="Multiple">
            <asp:ListItem>篮球</asp:ListItem>
            <asp:ListItem>排球</asp:ListItem>
            <asp:ListItem>羽毛球</asp:ListItem>
        </asp:ListBox>
        <asp:Button ID="Button5" runat="server" Text="Button" OnClick="Button5_Click" />
        <asp:Label ID="Label8" runat="server" Text="Label"></asp:Label>

    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {
        Label6.Text = DropDownList1.SelectedItem.Text;
        Label7.Text = DropDownList1.SelectedValue.ToString();
    }
    protected void Button3_Click(object sender, EventArgs e)
    {
        for (int i = 0; i < 10; i++)
        {
            DropDownList2.Items.Add("选项"+i.ToString());
        }
        DropDownList2.SelectedIndex = 3;
        Response.Write(DropDownList2.SelectedValue);
    }
    protected void Button4_Click(object sender, EventArgs e)
    {
        DropDownList2.Items.RemoveAt(2);
    }
    protected void Button5_Click(object sender, EventArgs e)
    {
        Label8.Text = "我的爱好是：";
        for (int i = 0; i < ListBox1.Items.Count; i++)
        {
            if (ListBox1.Items[i].Selected)
            {
                Label8.Text += ListBox1.Items[i].Text;
            }
        }
    }

<h2>面板控件：</h2>
        <asp:Panel ID="Panel1" runat="server" GroupingText="登录界面">
            <asp:Label ID="Label9" runat="server" Text="用户名："></asp:Label>
            <asp:TextBox ID="TextBox9" runat="server"></asp:TextBox>
            <br />
            <asp:Label ID="Label10" runat="server" Text="密 码："></asp:Label>
            <asp:TextBox ID="TextBox10" runat="server" TextMode="Password"></asp:TextBox>
            <br />
            <asp:Button ID="Button6" runat="server" Text="登 录" OnClick="Button6_Click" />
            <br />
            <asp:Label ID="Label11" runat="server" Text=""></asp:Label>
        </asp:Panel>
        <asp:Label ID="Label12" runat="server" Text=""></asp:Label>

protected void Button6_Click(object sender, EventArgs e)
    {
        Panel1.Visible = false;
        Label11.Text = "Label11 欢迎：" + TextBox9.Text.ToString();
        Label11.Text = Label11.Text + ",您输入的密码为："+TextBox10.Text.ToString();
        Label12.Text = "Label12 欢迎：" + TextBox9.Text.ToString();
        Label12.Text = Label12.Text + ",您输入的密码为：" + TextBox10.Text.ToString();
    }

<h2>日历控件：</h2>
        <asp:Calendar ID="Calendar1" runat="server" OnSelectionChanged="Calendar1_SelectionChanged"></asp:Calendar>
        <asp:Label ID="Label13" runat="server" Text="Label"></asp:Label><br />
        <asp:Label ID="Label14" runat="server" Text="Label"></asp:Label>

protected void Calendar1_SelectionChanged(object sender, EventArgs e)
    {
        Label13.Text = "You choose:\t" + Calendar1.SelectedDate.ToString();
        Label14.Text = "Today is:\t" + DateTime.Now.Date.ToString();
    }