专用于ASP.Net Web应用程序的日期控件

 原文引入：http://blog.csdn.net/nileel/article/details/1566051

专用于ASP.Net Web应用程序的日期控件

分类： ASP.NET/C#2007-04-16 09:20 518人阅读 评论(0) 收藏 举报

asp.netwebstringjavascriptnullhtml

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
    {
        #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 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>