博客上的日历控件的初步实现

咋也不知道咋用，就是看到了转载一下，留存一下

using System;
using System.Collections.Generic;
using System.Text;
using System.Web.UI;
using System.ComponentModel;

namespace ClassLibrary1
{
    public class  BlogDateControl:System.Web.UI.WebControls.WebControl,System.Web.UI.INamingContainer,System.Web.UI.IPostBackEventHandler   
    {
        private static readonly object ClickKey=new object();

        [Description("单击日期触发的时间！")]
        public event EventHandler Click
        {
            add
            {
                Events.AddHandler(ClickKey, value);
            }
            remove
            {
                Events.RemoveHandler(ClickKey, value);
            }
        }

        private static readonly string[] header = new string[] { "星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六" };

        private DateTime showDate;

        /// <summary>
        /// Gets or sets the show date.
        /// </summary>
        /// <value>The show date.</value>
        [Description("格式必须为yyyy-MM一样")] 
        public string ShowDate
        {
            get 
            {
                if (showDate == null)
                    showDate = Convert.ToDateTime(System.DateTime.Now.Year + "-" + System.DateTime.Now.Month + "-01");
                return showDate.ToString("yyyy-MM"); 
            }
            set 
            {
                if (value == null)
                {
                    showDate = Convert.ToDateTime(System.DateTime.Now.Year + "-" + System.DateTime.Now.Month + "-01");    
                }
                else
                {
                    showDate = Convert.ToDateTime(value+"-01");
                }
                
            }
        }

        protected override void AddAttributesToRender(HtmlTextWriter writer)
        {
            //为table标签定义属性和样式
           // writer.AddAttribute(HtmlTextWriterAttribute.Width, "287px");
            //writer.AddStyleAttribute(HtmlTextWriterStyle.BorderWidth, "1px");
            writer.AddAttribute(HtmlTextWriterAttribute.Border, "1px");
            writer.AddAttribute(HtmlTextWriterAttribute.Cellpadding, "0");
            writer.AddAttribute(HtmlTextWriterAttribute.Cellspacing, "0");
            base.AddAttributesToRender(writer);

        }

        /// <summary>
        /// 获取与此 Web 服务器控件相对应的 <see cref="T:System.Web.UI.HtmlTextWriterTag"></see> 值。此属性主要由控件开发人员使用。
        /// </summary>
        /// <value></value>
        /// <returns><see cref="T:System.Web.UI.HtmlTextWriterTag"></see> 枚举值之一。</returns>
        protected override HtmlTextWriterTag TagKey
        {
            get
            {
                return HtmlTextWriterTag.Table;
            }
        }
        /// <summary>
        /// 将控件的内容呈现到指定的编写器中。此方法主要由控件开发人员使用。
        /// </summary>
        /// <param name="writer"><see cref="T:System.Web.UI.HtmlTextWriter"></see>，表示要在客户端呈现 HTML 内容的输出流。</param>
        protected override void RenderContents(HtmlTextWriter writer)
        {
           
            
            writer.RenderBeginTag(HtmlTextWriterTag.Thead);
            writer.RenderBeginTag(HtmlTextWriterTag.Tr);
            writer.AddAttribute(HtmlTextWriterAttribute.Align, "center");
            writer.AddAttribute(HtmlTextWriterAttribute.Colspan, "7");
            writer.RenderBeginTag(HtmlTextWriterTag.Td);
            
            writer.Write(this.showDate.Year+"年"+this.showDate.Month+"月");
            writer.RenderEndTag();
            writer.RenderEndTag();
            writer.RenderEndTag();
            writer.RenderBeginTag(HtmlTextWriterTag.Tr);
            for (int i = 0; i < BlogDateControl.header.Length; i++)
            {
                writer.RenderBeginTag(HtmlTextWriterTag.Td);
                writer.Write(BlogDateControl.header[i]);
                writer.RenderEndTag();
            }

            writer.RenderEndTag();
            DateTime end=this.showDate.AddMonths(1);
            int days=((TimeSpan)end.Subtract(this.showDate)).Days;
            int spaceday = Convert.ToInt32(this.showDate.DayOfWeek);
            writer.RenderBeginTag(HtmlTextWriterTag.Tr);
            for (int i = 0; i < spaceday; i++)
            {
                writer.RenderBeginTag(HtmlTextWriterTag.Td);
                writer.WriteLine("&nbsp;");
                writer.RenderEndTag();
            }
            for (int i = 1; i <= days; i++)
            {
                writer.Write("<td οnclick=\"");
                writer.Write(Page.GetPostBackEventReference(this, this.ShowDate+"-"+i.ToString().PadLeft(2,'0')));
                writer.Write("\">"+i.ToString()+"</td>");
                
                //writer.RenderEndTag();
                if ((i + spaceday) % 7 == 0)
                {
                    writer.RenderEndTag();
                    writer.RenderBeginTag(HtmlTextWriterTag.Tr);
                }
            }
            if ((spaceday + days) % 7 != 0)
            {
                int allcount = spaceday + days > 35 ? 42 : 35;
                for (int i = 0; i < allcount - spaceday - days; i++)
                {
                    writer.RenderBeginTag(HtmlTextWriterTag.Td);
                    writer.Write("&nbsp;");
                    
                    writer.RenderEndTag();
                }
                writer.RenderEndTag();
            }

        }

        protected virtual void OnClick(StringEventArgs e)
        {
            EventHandler clickEventDelegate =
               (EventHandler)Events[ClickKey];
            if (clickEventDelegate != null)
            {
                clickEventDelegate(this, e);
            }

        }
    
        IPostBackEventHandler 成员
}

    public class StringEventArgs : EventArgs
    {
        private string argString;

        public string ArgString
        {
            get { return argString; }
        }

        public StringEventArgs(string arg)
        {
            this.argString = arg;
        }

        public override string ToString()
        {
            return this.argString;
        }
    }
}

转载于：https://www.cnblogs.com/deadshot123/archive/2007/05/21/753682.html