如何在下拉列表中按月份绑定月份？ [英] How to bind months in dropdown list by seleceted year?

问题描述

I have two dropdown lists one is bind with year from current year +5 years. Once year selected automatically remaining months will be bind.

for example:

Year     Month
====     =====
2016     Nov
         Dec

Year     Month
====     =====
2017     Jan
         Feb
         Mar
         .
         .
         Nov
         Dec

我的尝试：

What I have tried:

Bind Year:
 DropDownList1.DataSource = Enumerable.Range(DateTime.Now.Year, 5);
 DropDownList1.DataBind();

Bind Month:

  int remainingmonth = DateTime.Today.Month;
      
        DropDownList2.Items.Clear();
        
        for (int i = remainingmonth; i <= 12; i++)
         {
          DropDownList2.Items.Add(new System.Web.UI.WebControls.ListItem(DateTimeFormatInfo.CurrentInfo.GetMonthName(i) , i.ToString()));
         }

推荐答案

请查看此

设计：

Please check this
Design:

<asp:DropDownList ID="ddlYear" AutoPostBack="true" runat="server" OnSelectedIndexChanged="ddlYear_SelectedIndexChanged"></asp:DropDownList>

<asp:DropDownList ID="ddlMonth" runat="server"></asp:DropDownList>

代码：

Code:

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        ddlYear.DataSource = Enumerable.Range(DateTime.Now.Year, 5);
        ddlYear.DataBind();
        ddlYear.Items.Insert(0,"Please select");
    }
}

protected void ddlYear_SelectedIndexChanged(object sender, EventArgs e)
{
    int remainingmonth = Convert.ToInt32(ddlYear.SelectedItem.Text) == DateTime.Today.Year ? DateTime.Today.Month : 1;

    ddlMonth.Items.Clear();

    for (int i = remainingmonth; i <= 12; i++)
    {
        ddlMonth.Items.Add(new System.Web.UI.WebControls.ListItem(DateTimeFormatInfo.CurrentInfo.GetMonthName(i), i.ToString()));
    }
}

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