按用户更改日期标签

Question

我使用C＃.net编程预订系统

我想让用户通过图片上显示的箭头更改日期（请点击链接）

日期图片

我已经在屏幕上显示当前日期，但我不知道如何让用户使用箭头更改日期 这些是html代码：

<asp:Label ID="lblServerDateTime" runat="server" CssClass="auto-style13" style="font-size:30px;" />

这些是 C＃代码

protected void page_load(object sender, EventArgs e)
{
    lblServerDateTime.Text = DateTime.Now.ToString("M");
}

Answer 1

这个片段可以帮到你：

<强> .aspx的

 <asp:Button Text="Down" ID="btnDown" runat="server" OnClick="btnDown_Click" />
 <asp:Label ID="lblServerDateTime" runat="server" CssClass="auto-style13" Style="font-size: 30px;" />
 <asp:Button Text="UP" ID="btnUp" runat="server" OnClick="btnUp_Click" />

代码

protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            lblServerDateTime.Text = DateTime.Now.ToString("dd MMMM");
            calCurrentDay.SelectedDate = DateTime.Now;
            // Sets current date on initially.
        }
    }

protected void btnUp_Click(object sender, EventArgs e)
    {
        //Up button click will increase the date by one day
        DateTime.TryParse(lblServerDateTime.Text, out d);
        d = d.AddDays(1);
        lblServerDateTime.Text = d.ToString("dd MMMM");
        calCurrentDay.SelectedDate = d;
    }

protected void btnDown_Click(object sender, EventArgs e)
    {
        //Up button click will decrease the date by one day
        DateTime d;
        DateTime.TryParse(lblServerDateTime.Text, out d);
        d = d.AddDays(-1);
        lblServerDateTime.Text = d.ToString("dd MMMM");
        calCurrentDay.SelectedDate = d;
    }