DropDownList显示不同的月份对应不同的天数代码,Asp.Net代码库,德仔网

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【Asp.Net】 DropDownList显示不同的月份对应不同的天数
作者:Dezai.CN / 发布于2013/1/10/ 747
DropDownList1   表示年，DropDownList2表示月，DropDownList3表示天；   
  注意用将这三个DropDownList控件的AutoPostBack属性设为True。   
    
  用户可以方便地选择年月日，并且每月的日期会随着用户选择不同的年，月而发生相应的变化   
    
  其后台cs文件代码如下：   
    
      private   void   Page_Load(object   sender,   System.EventArgs   e)   
      {   
        DateTime   tnow=DateTime.Now;//现在时间   
        ArrayList     AlYear=new   ArrayList();   
        int   i;   
        for(i=2002;i<=2010;i++)   
        AlYear.Add(i);   
        ArrayList     AlMonth=new   ArrayList();   
        for(i=1;i<=12;i++)   
        AlMonth.Add(i);   
        if(!this.IsPostBack   )   
        {   
        DropDownList1.DataSource=AlYear;   
        DropDownList1.DataBind();//绑定年   
        //选择当前年   
        DropDownList1.SelectedValue=tnow.Year.ToString();     
              DropDownList2.DataSource=AlMonth;   
              DropDownList2.DataBind();//绑定月   
        //选择当前月   
          DropDownList2.SelectedValue=tnow.Month.ToString();     
          int   year,month;   
          year=Int32.Parse(DropDownList1.SelectedValue);   
          month=Int32.Parse(DropDownList2.SelectedValue);   
        BindDays(year,month);//绑定天   
          //选择当前日期   
          DropDownList3.SelectedValue=tnow.Day.ToString();       
        }   
      }   
    
    
      //判断闰年   
      private   bool   CheckLeap(int   year)   
      {   
        if((year%4==0)&&(year%100!=0)||(year%400==0))   
                          return   true;   
        else   return   false;       
      }   
      //绑定每月的天数   
      private   void   BindDays(   int   year,int   month)   
      {       int   i;   
        ArrayList     AlDay=new   ArrayList();   
                
          switch(month)   
          {   
            case   1:   
            case   3:   
            case   5:   
            case   7:   
            case   8:   
            case   10:   
            case   12:   
                    for(i=1;i<=31;i++)   
              AlDay.Add(i);     
              break;   
            case   2:   
              if   (CheckLeap(year))   
              {for(i=1;i<=29;i++)   
                  AlDay.Add(i);}   
              else   
              {for(i=1;i<=28;i++)   
                  AlDay.Add(i);}   
              break;   
            case   4:   
            case   6:   
            case   9:   
            case   11:   
              for(i=1;i<=30;i++)   
              AlDay.Add(i);     
              break;   
                        }   
        DropDownList3.DataSource=AlDay;   
        DropDownList3.DataBind();   
      }   
    
      
    
  //选择年   
      private   void   DropDownList1_SelectedIndexChanged(object   sender,   System.EventArgs   e)   
      {   
        int   year,month;   
        year=Int32.Parse(DropDownList1.SelectedValue);   
        month=Int32.Parse(DropDownList2.SelectedValue);   
        BindDays(year,month);   
      }   
  //选择月   
    
    
      private   void   DropDownList2_SelectedIndexChanged(object   sender,   System.EventArgs   e)   
      {   
        int   year,month;   
        year=Int32.Parse(DropDownList1.SelectedValue);   
        month=Int32.Parse(DropDownList2.SelectedValue);   
        BindDays(year,month);   
      } 
////////////////////////////////////////////////////////////////////////////////////////////////////////

namespace   WebApplication1   
  {   
  using   System;   
  using   System.Data;   
  using   System.Drawing;   
  using   System.Web;   
  using   System.Web.UI.WebControls;   
  using   System.Web.UI.HtmlControls;   
    
  ///   <summary>   
  ///   YearMonthDayDownDropList   的摘要说明。   
  ///   </summary>   
  public   abstract   class   YearMonthDayDownDropList   :   System.Web.UI.UserControl   
  {   
  //选择的年月日如：20021225   
  public   string   SelectTime   
  {     
  get     
  {   
  return   Request.Form[YearName]+Request.Form[MonthName]+Request.Form[DayName]+Request.Form[HourName]+Request.Form[MinuteName];   
  }   
  }   
  protected   int   ServerYear;   //服务器当前选择年   
  protected   int   ServerMonth;//服务器当前月   
  protected   int   ServerNowYear;   //服务器当前年   
  protected   int   ServerDay;   //服务器当前天   
  protected   int   ServerMonthDays;//当前月天数   
  protected   int   ServerHour;//小时   
  protected   int   ServerMinute;//分钟   
    
  protected   string   JavascriptFunName;   //此user   control发出的函数名称   
  protected   string   YearName;   //此user   control发出的年控件的名称   
  protected   string   MonthName;//此user   control发出的月控件的名称   
  protected   string   DayName;   //此user   control发出的日控件的名称   
  protected   string   HourName;//小时   
  protected   string   MinuteName;//分钟   
    
  private   void   Page_Load(object   sender,   System.EventArgs   e)   
  {   
  //   在此处放置用户代码以初始化页面   
  string   id=   this.UniqueID;   
    
  if(!this.Page.IsClientScriptBlockRegistered(id))   
  {   
  JavascriptFunName="chanday"+id+"()";   
  YearName="year"+id;   
  MonthName="month"+id;   
  DayName="day"+id;   
    
  string   scriptString   ="<script   language=javascript>";   
  scriptString=scriptString+"function   "+JavascriptFunName;   
  scriptString=scriptString+   "{   var   days;";   
  scriptString=scriptString+"   var   currentyear;";   
  scriptString=scriptString   +"days=31;";   
  scriptString=scriptString+"   if(window.document.forms[0]."+MonthName+".value==04||window.document.forms[0]."+MonthName+".value==06||window.document.forms[0]."+MonthName+".value==09||window.document.forms[0]."+MonthName+".value==11)";   
  scriptString=scriptString+"   days=30;";   
  scriptString=scriptString+"else   if(window.document.forms[0]."+MonthName+".value==02)   {";   
  scriptString=scriptString+"Nowyear=window.document.forms[0]."+YearName+".value   ;";   
  scriptString=scriptString+   "   if((Nowyear%4==0   &&Nowyear%100!=0)   ||   Nowyear%400==0)";   
  scriptString=scriptString+"   days=29;";   
  scriptString=scriptString+"   else   days=28;";     
  scriptString=scriptString+"   }";   
  scriptString=scriptString+   "   flen=window.document.forms[0]."+DayName+".length   ;";   
  scriptString=scriptString+"   window.document.forms[0]."+DayName+".length   =days;";   
  scriptString=scriptString+   "   i=flen+1;";   
  scriptString=scriptString+"for(i;i<=days;i++)";   
  scriptString=scriptString+"{";   
  scriptString=scriptString+"   window.document.forms[0]."+DayName+".options(i-1).text=i;";   
  scriptString=scriptString+"   window.document.forms[0]."+DayName+".options(i-1).value=i;";   
  scriptString=scriptString+"   }";   
  scriptString=scriptString+"}";   
  scriptString=scriptString+"</script>";   
  this.Page.RegisterClientScriptBlock(id,   scriptString);   
    
  }   
    
  DateTime   now=DateTime.Today;   
  ServerNowYear   =now.Year   ;   
    
  if(!Page.IsPostBack)   
  {     
    
  ServerYear=ServerNowYear   ;   
  ServerMonth=now.Month;   
  ServerDay=now.Day;   
  ServerMonthDays=GetNowMonthDays(ServerYear,ServerMonth);     
  ServerHour   =   DateTime.Now.Hour;   
  ServerMinute   =   DateTime.Now.Minute;   
  }   
  else     
  {   
  ServerYear=Convert.ToInt32(Request.Form[YearName]);   
  ServerMonth=Convert.ToInt32(Request.Form[MonthName]);     
  ServerDay=   Convert.ToInt32(Request.Form[DayName]);   
  ServerMonthDays=GetNowMonthDays(ServerYear,ServerMonth);   
  ServerHour   =   DateTime.Now.Hour;   
  ServerMinute   =   DateTime.Now.Minute;   
  }   
  }     
    
  //得到每个月的天数   
  private   int   GetNowMonthDays(int   ServerYear,int   ServerMonth)   
  {   
  int   ServerMonthDays=31;   
  if(ServerMonth==4||ServerMonth==6||ServerMonth==9||ServerMonth==11)   
  ServerMonthDays=30;   
  else   if(ServerMonth==02)     
  {   
  if((ServerYear%4==0   &&ServerYear%100!=0)   ||   ServerYear%400==0)   
  ServerMonthDays=29;   
  else   ServerMonthDays=28;     
  }   
  return   ServerMonthDays;   
  }   
    
  //填充   
  protected   void   FillOptions(int   StartValue,int   OptionsLength,int   SelectedOption)   
  {   
  for(int   j=StartValue;j<=OptionsLength;j++)     
  {   
  string   ShowOption;   
  if(j<10)   
  ShowOption="0"+j.ToString();   
  else   ShowOption=j.ToString();   
  if(j==SelectedOption)   
  Response.Write("   <OPTION   value="+ShowOption+"   selected>"+ShowOption+"</OPTION>");   
  else   Response.Write("   <OPTION   value="+ShowOption+"   >"+ShowOption+"</OPTION>");   
  }   
  }   
    
    
  #region   Web   Form   Designer   generated   code   
  override   protected   void   OnInit(EventArgs   e)   
  {   
  //   
  //   CODEGEN：该调用是   ASP.NET   Web   窗体设计器所必需的。   
  //   
  InitializeComponent();   
  base.OnInit(e);   
  }   
    
  ///   设计器支持所需的方法   -   不要使用   
  ///   代码编辑器修改此方法的内容。   
  ///   </summary>   
  private   void   InitializeComponent()   
  {   
  this.Load   +=   new   System.EventHandler(this.Page_Load);   
  }   
  #endregion   
  }   
  }
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