嚼的絮絮叨叨

一、新增使用者控制項。

二、處理程式：

三、如要從物件的SelectDates取出日期陣列，要在PagePrerender中取，因為這時候使用者控制項才會有完整的值。

<%@ Control Language="C#" ClassName="CalendarS" %>

<script runat="server"> 

    //建立型別為DateTime的陣列dates
     System.Collections.Generic.List<DateTime> dates; 

    //在PageLoad中初始化dates，如果有ViewState["dates"]就用，沒有就new
    protected void Page_Load(object sender, EventArgs e)

    {

        if (ViewState["dates"] != null)

            dates = (System.Collections.Generic.List<DateTime>)ViewState["dates"];

        else

            dates = new System.Collections.Generic.List<DateTime>();

    } 

    //日期控制項改變選取日時，就寫入dates中，
    //然後將選取日改為Datetime的最小值(配合畫面用)
    protected void Calendar1_SelectionChanged(object sender, EventArgs e)

    {

        foreach (DateTime dt in Calendar1.SelectedDates)

        {

            if (dates.Contains(dt))

                dates.Remove(dt);

            else

                dates.Add(dt);

        }

        Calendar1.SelectedDate = DateTime.MinValue;

    }

    //日期控制項繪製時，如為非本月，清除。
    //如為今日，設成跟日期控制項的預設底色。(分成周未跟平日)
    //如有出現在dates中，設為淺灰色
    protected void Calendar1_DayRender(object sender, DayRenderEventArgs e)

    {

        if (e.Day.IsOtherMonth)

        {

            e.Cell.Controls.Clear();

        }

        else

        {

            if (e.Day.Date == DateTime.Today)

                if (e.Day.IsWeekend)

                    e.Cell.BackColor = Calendar1.WeekendDayStyle.BackColor;

                else

                    e.Cell.BackColor = Calendar1.DayStyle.BackColor;

            if (dates.Contains(e.Day.Date))

                e.Cell.BackColor = System.Drawing.Color.LightGray;

        } 

    }

    //在Page_PreRender中，將dates存入ViewState["dates"]
    protected void Page_PreRender(object sender, EventArgs e)

    {

        ViewState["dates"] = dates;

    }

    //設定唯讀的屬性，回傳 日期陣列，接受 日期陣列
    public System.Collections.Generic.List<DateTime> SelectDates

    {

        get

        {

            if (ViewState["dates"] != null)

                dates = (System.Collections.Generic.List<DateTime>)ViewState["dates"];

            else

                dates = new System.Collections.Generic.List<DateTime>();

            dates.Sort();

            return dates;

        }

        set

        {

            ViewState["dates"] = value;

        }

    }

</script>

<asp:Calendar ID="Calendar1" runat="server" OnSelectionChanged="Calendar1_SelectionChanged"

    OnDayRender="Calendar1_DayRender" BackColor="White" BorderColor="#999999" CellPadding="4"

    DayNameFormat="Shortest" Font-Names="Verdana" Font-Size="8pt" ForeColor="Black"

    Height="180px" Width="200px">

    <SelectedDayStyle BackColor="#666666" Font-Bold="True" ForeColor="White" />

    <SelectorStyle BackColor="#CCCCCC" />

    <WeekendDayStyle BackColor="#FFFFCC" />

    <TodayDayStyle BackColor="#CCCCCC" ForeColor="Black" />

    <OtherMonthDayStyle ForeColor="Gray" />

    <NextPrevStyle VerticalAlign="Bottom" />

    <DayHeaderStyle BackColor="#CCCCCC" Font-Bold="True" Font-Size="7pt" />

    <TitleStyle BackColor="#999999" BorderColor="Black" Font-Bold="True" />

</asp:Calendar>