如何在asp.net中绑定数据？

假设一个表中有三个dropDownList，我想绑定它。假设在一个下拉列表中有天，在第二个下拉列表中有月，在第三个下拉列表中有年，现在我想绑定它们，以便我可以将其保存在数据库中。如何做到这一点？

此代码将为您提供一个简单的1-31，1-12，从当前年份到80年前。 不确定这是否正是您要查找的内容，但这就是如何动态绑定它们，以便您不需要硬编码.aspx页面上的所有listitem值

vb

c#

int索引=0；
对于（index=0；index在我的项目中，我已经为日期创建了web用户控件，从中您可以考虑填充三个下拉列表供自己使用

这是页面（.ascx）的设计视图-


DD
嗯
YYYY
简
二月
前进
四月
也许
六月
七月
八月
九月
十月
十一月
12月

下面是web用户控件的ascx.cs代码-

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class WUCDate : System.Web.UI.UserControl
{
    //Date user control

    int i;
    private string currentdate = "01";// Here we can define the minimum date 
    private string currentmonth = "01";// Here We Can define the minimum month
    private string currentyear = "2006";// Here we can define the minimum year
    private string date = "01";
    private string month = "01";
    private string year = "2006";

    // fill the date in date dropdown list
    void fillDate()
    {
        string dd;
        for (i = 1; i <= 31; i++)
        {
            if (i <= 9)
            {
                dd = "0" + i.ToString();

            }
            else
            {
                dd = i.ToString();

            }
            ddldate.Items.Add(dd);
        }

    }

    // fill the date in month dropdown list
    void fillMonth()
    {
        string mm;
        for (i = 1; i <= 12; i++)
        {
            if (i <= 9)
            {
               mm ="0" + i.ToString();

            }
            else
            {
                mm = i.ToString();

            }
            //ddlmonth.Items.Add(mm);

        }

    }
    // fill the date in date dropdown list
    void fillYear()
    {
        string yy;
        for (i = 1900; i <= DateTime.Now.Year+5 ; i++)
        {
            yy = i.ToString();
            ddlyear.Items.Add(yy);
        }
    }


    // create the property for get the date
    public string Date
    {
        get
        {
            return date;
        }
        set
        {
            date = value;
        }

    }

    // create the property for get the current date
    public string CurrentDate
    {
        get
        {
            return currentdate;
        }
        set
        {
            currentdate = value;
        }
    }


    // create the property for get the month
    public string Month
    {
        get
        {
            return month;
        }
        set
        {
            month = value;
        }

    }
    // create the property for get the current month
    public string CurrentMonth
    {
        get
        {
            return currentmonth;
        }
        set
        {
            currentmonth = value;
        }
    }

    // create the property for get the year
    public string Year
    {
        get
        {
            return year;
        }
        set
        {
            year = value;
        }


    }

    // create the property for get the current year
    public string CurrentYear
    {
        get
        {
            return currentyear;
        }
    }

    //bind the control on page load
    protected void Page_Load(object sender, EventArgs e)
    {

        if (IsPostBack)
        {

            this.Date = ddldate.SelectedValue;
            this.Month = ddlmonth.SelectedValue;
            this.Year = ddlyear.SelectedValue;
            currentdate = this.Date;
            currentmonth = this.Month;
            currentyear = this.Year;
            display();

         }
        else
        {
            fillDate();
            fillMonth();
            fillYear();
            currentdate = this.Date;
            currentmonth = this.Month;
            currentyear = this.Year;
            this.Date = ddldate.SelectedValue;
            this.Month = ddlmonth.SelectedValue;
            this.Year = ddlyear.SelectedValue;
            display();
        }


    }

    // set current date in control
    protected void display()
    {
        ddldate.SelectedValue = this.CurrentDate.ToString();
        ddlmonth.SelectedValue = this.CurrentMonth.ToString();
        ddlyear.SelectedValue = this.CurrentYear.ToString();
    }
}

使用系统；
使用系统数据；
使用系统配置；
使用系统集合；
使用System.Web；
使用System.Web.Security；
使用System.Web.UI；
使用System.Web.UI.WebControl；
使用System.Web.UI.WebControl.WebParts；
使用System.Web.UI.HTMLControl；
公共部分类WUCDate:System.Web.UI.UserControl
{
//日期用户控件
int i；
私有字符串currentdate=“01”//这里我们可以定义最小日期
private string currentmount=“01”//这里我们可以定义最小月份
private string currentyear=“2006”//这里我们可以定义最小年份
私有字符串date=“01”；
私有字符串month=“01”；
私人字符串year=“2006”；
//在日期下拉列表中填写日期
作废日期（）
{
字符串dd；
对于（i=1；i）如果他们已经有了数据，即天、月和年，那么你需要绑定它们做什么？naval，应该有一种方法来绑定每个月的确切天数。我们可以硬编码月和年，但每个月的天数不是31天。我同意你的看法
int index = 0;
for (index = 0; index <= 30; index++) {
this.ddlDay.Items.Insert(index, new ListItem(index + 1, index + 1));
} 
for (index = 0; index <= 11; index++) {
this.ddlMonth.Items.Insert(index, new ListItem(index + 1, index + 1));
}
for (index = DateTime.Now.Year; index >= DateTime.Now.Year - 80; index += -1) {
this.ddlYear.Items.Insert((DateTime.Now.Year - index), new ListItem(index, index));
}

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="WUCDate.ascx.cs" Inherits="WUCDate" %>
<table>
    <tr>
        <td>
            <span style="font-size: 10pt" class="ElearningTotalLabel">
            DD</span></td>
        <td style="width: 53px">
            <span style="font-size: 10pt" class="ElearningTotalLabel">
            MM</span></td>
        <td style="width: 67px" >
            <span style="font-size: 10pt" class="ElearningTotalLabel">
            YYYY</span></td>
    </tr>
    <tr>
        <td style="height: 24px" >
            <asp:DropDownList ID="ddldate" runat="server" Height="22px" Width="39px" CssClass="ElearningDropdownbox" Font-Bold="True">
            </asp:DropDownList></td>
        <td style="width: 53px; height: 24px">
            <asp:DropDownList ID="ddlmonth" runat="server" Width="55px" CssClass="ElearningDropdownbox" Font-Bold="True">
                <asp:ListItem Value="01">Jan</asp:ListItem>
                <asp:ListItem Value="02">Feb</asp:ListItem>
                <asp:ListItem Value="03">March</asp:ListItem>
                <asp:ListItem Value="04">April</asp:ListItem>
                <asp:ListItem Value="05">May</asp:ListItem>
                <asp:ListItem Value="06">June</asp:ListItem>
                <asp:ListItem Value="07">July</asp:ListItem>
                <asp:ListItem Value="08">Aug</asp:ListItem>
                <asp:ListItem Value="09">Sept</asp:ListItem>
                <asp:ListItem Value="10">Oct</asp:ListItem>
                <asp:ListItem Value="11">Nov</asp:ListItem>
                <asp:ListItem Value="12">Dec</asp:ListItem>
            </asp:DropDownList></td>
        <td style="width: 67px; height: 24px;">
            <asp:DropDownList ID="ddlyear" runat="server" Width="68px" CssClass="ElearningDropdownbox" Font-Bold="True">
            </asp:DropDownList></td>
    </tr>
</table>

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class WUCDate : System.Web.UI.UserControl
{
    //Date user control

    int i;
    private string currentdate = "01";// Here we can define the minimum date 
    private string currentmonth = "01";// Here We Can define the minimum month
    private string currentyear = "2006";// Here we can define the minimum year
    private string date = "01";
    private string month = "01";
    private string year = "2006";

    // fill the date in date dropdown list
    void fillDate()
    {
        string dd;
        for (i = 1; i <= 31; i++)
        {
            if (i <= 9)
            {
                dd = "0" + i.ToString();

            }
            else
            {
                dd = i.ToString();

            }
            ddldate.Items.Add(dd);
        }

    }

    // fill the date in month dropdown list
    void fillMonth()
    {
        string mm;
        for (i = 1; i <= 12; i++)
        {
            if (i <= 9)
            {
               mm ="0" + i.ToString();

            }
            else
            {
                mm = i.ToString();

            }
            //ddlmonth.Items.Add(mm);

        }

    }
    // fill the date in date dropdown list
    void fillYear()
    {
        string yy;
        for (i = 1900; i <= DateTime.Now.Year+5 ; i++)
        {
            yy = i.ToString();
            ddlyear.Items.Add(yy);
        }
    }


    // create the property for get the date
    public string Date
    {
        get
        {
            return date;
        }
        set
        {
            date = value;
        }

    }

    // create the property for get the current date
    public string CurrentDate
    {
        get
        {
            return currentdate;
        }
        set
        {
            currentdate = value;
        }
    }


    // create the property for get the month
    public string Month
    {
        get
        {
            return month;
        }
        set
        {
            month = value;
        }

    }
    // create the property for get the current month
    public string CurrentMonth
    {
        get
        {
            return currentmonth;
        }
        set
        {
            currentmonth = value;
        }
    }

    // create the property for get the year
    public string Year
    {
        get
        {
            return year;
        }
        set
        {
            year = value;
        }


    }

    // create the property for get the current year
    public string CurrentYear
    {
        get
        {
            return currentyear;
        }
    }

    //bind the control on page load
    protected void Page_Load(object sender, EventArgs e)
    {

        if (IsPostBack)
        {

            this.Date = ddldate.SelectedValue;
            this.Month = ddlmonth.SelectedValue;
            this.Year = ddlyear.SelectedValue;
            currentdate = this.Date;
            currentmonth = this.Month;
            currentyear = this.Year;
            display();

         }
        else
        {
            fillDate();
            fillMonth();
            fillYear();
            currentdate = this.Date;
            currentmonth = this.Month;
            currentyear = this.Year;
            this.Date = ddldate.SelectedValue;
            this.Month = ddlmonth.SelectedValue;
            this.Year = ddlyear.SelectedValue;
            display();
        }


    }

    // set current date in control
    protected void display()
    {
        ddldate.SelectedValue = this.CurrentDate.ToString();
        ddlmonth.SelectedValue = this.CurrentMonth.ToString();
        ddlyear.SelectedValue = this.CurrentYear.ToString();
    }
}