专用于ASP.Net Web应用程序的日期控件

由3个dropdownlist组成的选择日期控件
可以设置相应属性

代码如下：

 using System; using System.Collections; using System.Collections.Specialized; using System.ComponentModel; using System.IO; using System.Text; using System.Web.UI; using System.Web.UI.Design.WebControls; using System.Web.UI.WebControls; namespace AppCode ...{ /**//// <summary> /// AspNetDate 选择输入日期控件 /// </summary> [DefaultProperty("Text"), ParseChildren(false), PersistChildren(false), Description("专用于ASP.Net Web应用程序的日期控件"), Designer(typeof(DateDesigner)), ToolboxData("<{0}:WSCDate runat=server></{0}:WSCDate>")] public class WSCDate:Panel,INamingContainer,IPostBackDataHandler ...{ 属性#region 属性 /**//// <summary> /// 获取/设置日期值。 /// </summary> [Bindable(true), Browsable(true), Description("日期值"), Category("外观"), DefaultValue("")] public string Text ...{ get ...{ if (ViewState["Text"] != null) ...{ return ViewState["Text"].ToString(); } else ...{ if (IsNull) ...{ return ""; } else ...{ DateTime date=System.DateTime.Today; string str=""; switch (DateFormat) ...{ case "YMD": str=date.ToString("yyyy-MM-dd",System.Globalization.DateTimeFormatInfo.InvariantInfo); break; case "YM": str=date.ToString("yyyy-MM",System.Globalization.DateTimeFormatInfo.InvariantInfo); break; case "Y": str=date.Year.ToString(); break; } return str; } } } set ...{ if (value=="") ...{ ViewState["Text"] = ""; } else if (DateFormat=="YMD") ...{ DateTime date; try ...{ date=Convert.ToDateTime(value); } catch ...{ date=System.DateTime.Today; } string str = date.ToString("yyyy-MM-dd",System.Globalization.DateTimeFormatInfo.InvariantInfo); if (str=="1900-01-01") str=""; ViewState["Text"] =str; } else ...{ ViewState["Text"] = value; } } } /**//// <summary> /// 获取/设置日期值是否允许空。 /// </summary> [Browsable(true), Description("日期值是否允许空"), Category("布局"), DefaultValue(false)] public bool IsNull ...{ get ...{ return (ViewState["IsNull"]==null)?false:true; } set ...{ if (value) ViewState["IsNull"]=true; } } /**//// <summary> /// 获取/设置日期值格式(YMD:年-月-日 YM:年-月 Y:年)。 /// </summary> [Browsable(true), Description("日期值格式(YMD:年-月-日 YM:年-月 Y:年)"), Category("布局"), DefaultValue("YMD")] public string DateFormat ...{ get ...{ return (ViewState["DateFormat"]==null)?"YMD":(string)ViewState["DateFormat"]; } set ...{ ViewState["DateFormat"]=value; } } /**//// <summary> /// 获取/设置日期值能否编辑。 /// </summary> [Browsable(true), Description("能否编辑"), Category("行为"), DefaultValue(true)] public override bool Enabled ...{ get ...{ return (ViewState["Enabled"]==null)?true:false; } set ...{ if (!value) ViewState["Enabled"]=false; } } /**//// <summary> /// 获取/设置日期值中可供选择的年份长度。 /// </summary> [Browsable(true), Description("日期值中可供选择的年份长度"), Category("布局"), DefaultValue(100)] public int Length ...{ get ...{ object obj=ViewState["Length"]; return (obj==null)?100:(int)obj; } set ...{ ViewState["Length"]=value; } } /**//// <summary> /// 获取/设置选择年份的结束值。 /// </summary> [Browsable(true), Description("日期值中选择结束年份,当小于100时表示距今年数"), Category("布局"), DefaultValue(0)] public int End ...{ get ...{ object obj=ViewState["End"]; int y; if (obj==null) ...{ y=System.DateTime.Today.Year; } else ...{ y=(int)obj; if (y<100) ...{ y=System.DateTime.Today.Year+y; } } return y; } set ...{ ViewState["End"]=value; } } /**//// <summary> /// 获取选择年份的开始值。 /// </summary> [Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)] public int Start ...{ get...{return End-Length;} } #endregion 重写事件#region 重写事件 /**//// <summary> /// 重写OnLoad 方法。 /// </summary> /// <param name="e">包含事件数据的 <see cref="EventArgs"/> 对象。</param> protected override void OnLoad(EventArgs e) ...{ if (Page.IsPostBack) ...{ string y=Page.Request.Form[this.UniqueID+"_year"]; string m=Page.Request.Form[this.UniqueID+"_month"]; string d=Page.Request.Form[this.UniqueID+"_day"]; switch (DateFormat) ...{ case "YMD": if (y=="" || m=="" || d=="") ...{ Text=""; } else ...{ Text=y+"-"+m+"-"+d; } break; case "YM": if (y=="" || m=="") ...{ Text=""; } else ...{ Text=y+"-"+m; } break; case "Y": if (y=="") ...{ Text=""; } else ...{ Text=y; } break; } } base.OnLoad(e); } /**//// <summary> /// 重写<see cref="System.Web.UI.WebControls.WebControl.AddAttributesToRender"/> 方法，验证是否有form(runat=server)控件 /// </summary> /// <param name="writer"></param> protected override void AddAttributesToRender(HtmlTextWriter writer) ...{ if(this.Page!=null) this.Page.VerifyRenderingInServerForm(this); base.AddAttributesToRender(writer); } /**//// <summary> /// 重写<see cref="System.Web.UI.Control.OnPreRender"/>方法。 /// </summary> /// <param name="e">包含事件数据的 <see cref="EventArgs"/> 对象。</param> protected override void OnPreRender(EventArgs e) ...{ string strJS=@"<mce:script language='javascript'><!-- function InitYear(pName,start,length,y) { var selYear=eval('document.forms[0].'+pName+'_year'); var n=selYear.length; selYear.length=n+length+1; for (i=0;i<=length;i++) { selYear.options[n+i].value=(i+start); selYear.options[n+i].text=(i+start); } if (y==0) { selYear.selectedIndex =0; } else { if (y>start) { if (y-start<=length) { selYear.selectedIndex = n+y-start; } else { selYear.selectedIndex = length; } } } } function InitMonth(pName,m) { var selMonth=eval('document.all.'+pName+'_month'); var n=selMonth.length; selMonth.length=n+12; for (i=1;i<10;i++) { selMonth.options[n+i-1].value='0'+i; selMonth.options[n+i-1].text=i; } for (i=10;i<=12;i++) { selMonth.options[n+i-1].value=i; selMonth.options[n+i-1].text=i; } if (m==0) { selMonth.selectedIndex=0; } else { selMonth.selectedIndex = n+m-1; } } function InitDay(pName,d) { var selDay=eval('document.all.'+pName+'_day'); var n=selDay.length; selDay.length=n+31; for (i=1;i<10;i++) { selDay.options[n+i-1].value='0'+i; selDay.options[n+i-1].text=i; } for (i=10;i<=31;i++) { selDay.options[n+i-1].value=i; selDay.options[n+i-1].text=i; } if (d==0) { selDay.selectedIndex = 0; } else { selDay.selectedIndex = n+d-1; } dateChange(pName); } function dateChange(pName) { var selYear=eval('document.forms[0].'+pName+'_year'); var year=selYear.options[selYear.selectedIndex].value; if (year!='') { var selMonth=eval('document.all.'+pName+'_month'); var month=selMonth.options[selMonth.selectedIndex].value; if (month!='') { var date=new Date(year,month,0); var day=date.getDate(); var selDay=eval('document.all.'+pName+'_day'); var tmp=1; if (selDay.selectedIndex>0) { tmp=selDay.options[selDay.selectedIndex].value; } selDay.length=day; for (i=1;i<10;i++) { selDay.options[i-1].value='0'+i; selDay.options[i-1].text=i; } for (i=10;i<=day;i++) { selDay.options[i-1].value=i; selDay.options[i-1].text=i; } if (tmp>day) { selDay.selectedIndex=day-1; } else { selDay.selectedIndex=tmp-1; } } } } // --></mce:script>"; Page.RegisterClientScriptBlock("EnableDays",strJS); base.OnPreRender(e); } /**//// <summary> /// 将此控件呈现给指定的输出参数。 /// </summary> /// <param name="writer"> 要写出到的 HTML 编写器 </param> protected override void Render(HtmlTextWriter writer) ...{ writer.Write("<table border='0' cellpadding='0' cellspacing='0'><tr><td nowrap align='left'>"); int y=0; int m=0; int d=0; string str=Text; if (str.Length>=4) ...{ y=Convert.ToInt32(str.Substring(0,4)); if (str.Length>=7) ...{ m=Convert.ToInt32(str.Substring(5,2)); if (str.Length>=10) ...{ d=Convert.ToInt32(str.Substring(8,2)); } } } bool isDate=(DateFormat=="YMD"); if (Enabled) ...{ bool isNull=IsNull; writer.Write("<select name='"+this.UniqueID+"_year'"); if (isDate) ...{ writer.Write(" onchange="dateChange('"+this.UniqueID+"')""); } writer.Write(">"); if (isNull) ...{ writer.Write("<option value=''></option>"); } writer.Write("</select>年"); if (DateFormat.Length>1) ...{ writer.Write("<select name='"+this.UniqueID+"_month'"); if (isDate) ...{ writer.Write(" onchange="dateChange('"+this.UniqueID+"')""); } writer.Write(">"); if (isNull) ...{ writer.Write("<option value=''></option>"); } writer.Write("</select>月"); writer.Write(@" <mce:script language='javascript'><!-- InitYear('"+this.UniqueID+"',"+Start.ToString()+","+Length.ToString()+","+y.ToString()+@"); InitMonth('"+this.UniqueID+"',"+m.ToString()+@"); // --></mce:script>"); if (isDate) ...{ writer.Write("<select name='"+this.UniqueID+"_day'>"); if (isNull) ...{ writer.Write("<option value=''></option>"); } writer.Write("</select>日"); writer.Write(@" <mce:script language='javascript'><!-- InitDay('"+this.UniqueID+"',"+d.ToString()+@"); // --></mce:script>"); } } } else ...{ if (y==0 || m==0) ...{ writer.Write(" "); } else ...{ writer.Write(y.ToString()+"年"+m.ToString()+"月"); if (d!=0) ...{ writer.Write(d.ToString()+"日"); } } } writer.Write("</td></tr></table>"); } public event EventHandler TextChanged; /**//// <summary> /// 当由类实现时，为 ASP.NET 服务器控件处理回发数据。 /// </summary> /// <param name="postDataKey">控件的主要标识符</param> /// <param name="postCollection">所有传入名称值的集合</param> /// <returns>如果服务器控件的状态在回发发生后更改，则为 true；否则为 false。</returns> public virtual bool LoadPostData(string postDataKey, NameValueCollection postCollection) ...{ String presentValue = Text; String postedValue = postCollection[postDataKey]; if (presentValue == null || !presentValue.Equals(postedValue)) ...{ Text = postedValue; return true; } return false; } /**//// <summary> /// 当由类实现时，用信号要求服务器控件对象通知 ASP.NET 应用程序该控件的状态已更改。 /// </summary> public virtual void RaisePostDataChangedEvent() ...{ OnTextChanged(EventArgs.Empty); } protected virtual void OnTextChanged(EventArgs e) ...{ if (TextChanged != null) TextChanged(this,e); } #endregion } 控件设计器#region 控件设计器 /**//// <summary> /// 服务器控件设计器。 /// </summary> public class DateDesigner:System.Web.UI.Design.WebControls.PanelDesigner ...{ /**//// <summary> /// 初始化 PagerDesigner 的新实例。 /// </summary> public DateDesigner() ...{ this.ReadOnly=true; } private WSCDate wb; /**//// <summary> /// 获取用于在设计时表示关联控件的 HTML。 /// </summary> /// <returns>用于在设计时表示控件的 HTML。</returns> public override string GetDesignTimeHtml() ...{ wb=(WSCDate)Component; wb.Text=""; StringWriter sw=new StringWriter(); HtmlTextWriter writer=new HtmlTextWriter(sw); wb.RenderControl(writer); return sw.ToString(); } /**//// <summary> /// 获取在呈现控件时遇到错误后在设计时为指定的异常显示的 HTML。 /// </summary> /// <param name="e">要为其显示错误信息的异常。</param> /// <returns>设计时为指定的异常显示的 HTML。</returns> protected override string GetErrorDesignTimeHtml(Exception e) ...{ string errorstr="创建控件时出错："+e.Message; return CreatePlaceHolderDesignTimeHtml(errorstr); } } #endregion }

使用方法：在asp.net 页中加入

<%@ Register TagPrefix="cc1" Namespace="AppCode" Assembly="AppCode" %>

<cc1:wscdate id="WSCDate1" runat="server" IsNull="False" Length="46" End="2050" Wrap="False"></cc1:wscdate>