用多个DropDownList分别来绑定多个年月日

本文转载自查看原文 2012-10-16 00:08 4403 UserControl/ LINQ/ HTML/CSS/ Generic/ ASP.NET/ DropDownList/ ASCX/ ListItem/ Lambda/ OnSelectedIndexChanged/ SelectedItem

首先看看效果：

年与月的数据源，较好定义，而日的数据源即需要根据年与月选择之后，方可获取到那年月的所有日数。如年：

Year

List< int> i_Year
    {
         get
        {
            List< int> y = new List< int>();
             int Ny = DateTime.Now.Year;
             for ( int i = 1953; i <= Ny; i++)
            {
                y.Add(i);
            }
             return y;
        }
    }

月的数据源：

Month

List< int> i_Month
    {
         get
        {
            List< int> m = new List< int>();
             for ( int i = 1; i <= 12; i++)
            {
                m.Add(i);
            }
             return m;
        }
    }

日的数据源：

Day

public List< int> i_Day( int year, int month)
    {
         int days = DateTime.DaysInMonth(year, month);
        List< int> d = new List< int>();

         for ( int i = 1; i <= days; i++)
        {
            d.Add(i);
        }
         return d;
    }

由于多个地方是DropDownList数据绑定，因此Insus.NET先写一个通用DropDownList数据绑定的方法：

DropDownlistParse

private void DropDownlistParse(DropDownList ddl, object dataSource, string dataTextField, string dataValueField)
    {
        ddl.DataSource = dataSource;
        ddl.DataTextField = dataTextField;
        ddl.DataValueField = dataValueField;
        ddl.DataBind();
        ddl.Items.Insert( 0, new ListItem( string.Empty, string.Empty));
    }

这样的话，在需要绑定的地方，即管传入参数即可。如在Page_Load时，需要对年与月的DropDownList数据绑定：

View Code

   protected void Page_Load( object sender, EventArgs e)
    {
         if (!IsPostBack)
        {
            Data_Binding();
        }
    }

     private void Data_Binding()
    {
        DropDownlistParse( this.DropDownListYear, i_Year.Select(y => new { value = y }).ToList(), " value ", " value ");
        DropDownlistParse( this.DropDownListMonth, i_Month.Select(m => new { value = m }).ToList(), " value ", " value ");
         this.DropDownListDay.Items.Insert( 0, new ListItem( string.Empty, string.Empty));
    }

在年或月DropDownlist控件有异动时，作相应对日的DropDownList控件数据绑定：

View Code

protected void DropDownListYear_SelectedIndexChanged( object sender, EventArgs e)
    {
        DayDataBinding();
    }

     protected void DropDownListMonth_SelectedIndexChanged( object sender, EventArgs e)
    {
        DayDataBinding();
    }

     private void DayDataBinding()
    {
         if ( this.DropDownListYear.SelectedIndex == - 1 || string.IsNullOrEmpty ( this.DropDownListYear.SelectedItem.Value)) return;
         if ( this.DropDownListMonth.SelectedIndex == - 1 || string.IsNullOrEmpty( this.DropDownListMonth.SelectedItem.Value)) return;

         int y = Convert.ToInt32( this.DropDownListYear.SelectedItem.Value);
         int m = Convert.ToInt32( this.DropDownListMonth.SelectedItem.Value);

        DropDownlistParse( this.DropDownListDay, i_Day(y, m).Select(d => new { value = d }).ToList(), " value ", " value ");
    }

我们还要为了获取年月日三个DropDownList控件的值，因此写还得写三个属性：

View Code

private int? _year;
     private int? _month;
     private int? _day;

     public int? Year
    {
         get
        {
             if (ViewState[ " Year "] != null)
            {
                 return Convert.ToInt32(ViewState[ " Year "]);
            }

             if ( this.DropDownListYear.SelectedIndex == - 1 || string.IsNullOrEmpty( this.DropDownListYear.SelectedItem.Value))
                 return null;
             else
                 return Convert.ToInt32( this.DropDownListYear.SelectedItem.Value);
        }
         set
        {
            ViewState[ " Year "] = value;
        }
    }

     public int? Month
    {
         get
        {
             if (ViewState[ " Month "] != null)
            {
                 return Convert.ToInt32(ViewState[ " Month "]);
            }
             if ( this.DropDownListMonth.SelectedIndex == - 1 || string.IsNullOrEmpty( this.DropDownListMonth.SelectedItem.Value))
                 return null;
             else
                 return Convert.ToInt32( this.DropDownListMonth.SelectedItem.Value);

        }
         set
        {
            ViewState[ " Month "] = value;
        }
    }

     public int? Day
    {
         get
        {
             if (ViewState[ " Day "] != null)
            {
                 return Convert.ToInt32(ViewState[ " Day "]);
            }
             if ( this.DropDownListDay.SelectedIndex == - 1 || string.IsNullOrEmpty( this.DropDownListDay.SelectedItem.Value))
                 return null;
             else
                 return Convert.ToInt32( this.DropDownListDay.SelectedItem.Value);
        }
         set
        {
            ViewState[ " Day "] = value;
        }
    }

最后是ASCX的html:

View Code

<% @ Control Language = " C# " AutoEventWireup = " true " CodeFile = " InsusDate.ascx.cs " Inherits = " InsusDate " %>
< asp:DropDownList ID ="DropDownListYear" runat ="server" AutoPostBack ="true" OnSelectedIndexChanged ="DropDownListYear_SelectedIndexChanged" Width ="60px" ></ asp:DropDownList >年 < asp:DropDownList ID ="DropDownListMonth" runat ="server" AutoPostBack ="true" OnSelectedIndexChanged ="DropDownListMonth_SelectedIndexChanged" Width ="40PX" ></ asp:DropDownList >月 < asp:DropDownList ID ="DropDownListDay" runat ="server" Width ="40PX" ></ asp:DropDownList >日

完整的ASCX.cs:

View Code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class InsusDate : System.Web.UI.UserControl
{
     private int? _year;
     private int? _month;
     private int? _day;

     public int? Year
    {
         get
        {
             if (ViewState[ " Year "] != null)
            {
                 return Convert.ToInt32(ViewState[ " Year "]);
            }

             if ( this.DropDownListYear.SelectedIndex == - 1 || string.IsNullOrEmpty( this.DropDownListYear.SelectedItem.Value))
                 return null;
             else
                 return Convert.ToInt32( this.DropDownListYear.SelectedItem.Value);
        }
         set
        {
            ViewState[ " Year "] = value;
        }
    }

     public int? Month
    {
         get
        {
             if (ViewState[ " Month "] != null)
            {
                 return Convert.ToInt32(ViewState[ " Month "]);
            }
             if ( this.DropDownListMonth.SelectedIndex == - 1 || string.IsNullOrEmpty( this.DropDownListMonth.SelectedItem.Value))
                 return null;
             else
                 return Convert.ToInt32( this.DropDownListMonth.SelectedItem.Value);

        }
         set
        {
            ViewState[ " Month "] = value;
        }
    }

     public int? Day
    {
         get
        {
             if (ViewState[ " Day "] != null)
            {
                 return Convert.ToInt32(ViewState[ " Day "]);
            }
             if ( this.DropDownListDay.SelectedIndex == - 1 || string.IsNullOrEmpty( this.DropDownListDay.SelectedItem.Value))
                 return null;
             else
                 return Convert.ToInt32( this.DropDownListDay.SelectedItem.Value);
        }
         set
        {
            ViewState[ " Day "] = value;
        }
    }

     protected void Page_Load( object sender, EventArgs e)
    {
         if (!IsPostBack)
        {
            Data_Binding();
        }
    }

     private void Data_Binding()
    {
        DropDownlistParse( this.DropDownListYear, i_Year.Select(y => new { value = y }).ToList(), " value ", " value ");
        DropDownlistParse( this.DropDownListMonth, i_Month.Select(m => new { value = m }).ToList(), " value ", " value ");
         this.DropDownListDay.Items.Insert( 0, new ListItem( string.Empty, string.Empty));
    }

     protected void DropDownListYear_SelectedIndexChanged( object sender, EventArgs e)
    {
        DayDataBinding();
    }

     protected void DropDownListMonth_SelectedIndexChanged( object sender, EventArgs e)
    {
        DayDataBinding();
    }

     private void DayDataBinding()
    {
         if ( this.DropDownListYear.SelectedIndex == - 1 || string.IsNullOrEmpty ( this.DropDownListYear.SelectedItem.Value)) return;
         if ( this.DropDownListMonth.SelectedIndex == - 1 || string.IsNullOrEmpty( this.DropDownListMonth.SelectedItem.Value)) return;

         int y = Convert.ToInt32( this.DropDownListYear.SelectedItem.Value);
         int m = Convert.ToInt32( this.DropDownListMonth.SelectedItem.Value);

        DropDownlistParse( this.DropDownListDay, i_Day(y, m).Select(d => new { value = d }).ToList(), " value ", " value ");
    }

     private void DropDownlistParse(DropDownList ddl, object dataSource, string dataTextField, string dataValueField)
    {
        ddl.DataSource = dataSource;
        ddl.DataTextField = dataTextField;
        ddl.DataValueField = dataValueField;
        ddl.DataBind();
        ddl.Items.Insert( 0, new ListItem( string.Empty, string.Empty));
    }

    List< int> i_Year
    {
         get
        {
            List< int> y = new List< int>();
             int Ny = DateTime.Now.Year;
             for ( int i = 1953; i <= Ny; i++)
            {
                y.Add(i);
            }
             return y;
        }
    }

    List< int> i_Month
    {
         get
        {
            List< int> m = new List< int>();
             for ( int i = 1; i <= 12; i++)
            {
                m.Add(i);
            }
             return m;
        }
    }

     public List< int> i_Day( int year, int month)
    {
         int days = DateTime.DaysInMonth(year, month);
        List< int> d = new List< int>();

         for ( int i = 1; i <= days; i++)
        {
            d.Add(i);
        }
         return d;
    }
}

可以把ASCX保存为一个ASCX用户控件，在网页拉进去即可。

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