ASP.NET生成日历

 public string GetDayList(DateTime? date)
 {
     int day = ;
     var minDate = Convert.ToDateTime(((DateTime)(date ?? DateTime.Now)).ToString("yyyy-MM-01"));
     var maxDate = minDate.AddMonths().AddDays(-);

     var sb = new StringBuilder();

     sb.Append("<table>");
     sb.Append("<thead>");
     sb.Append("<tr>");
     sb.Append("<th>周日</th><th>周一</th><th>周二</th><th>周三</th><th>周四</th><th>周五</th><th>周六</th>");
     sb.Append("</tr>");
     sb.Append("</thead>");
     sb.Append("<tbody>");
     sb.Append("<tr>");
     while (true)
     {
         if (minDate > maxDate)
         {
             if (day > )
             {
                 break;
             }
             else
             {
                 sb.Append("<td></td>");
                 day++;
                 continue;
             }
         }

         if ((int)minDate.DayOfWeek == day)
         {
             sb.AppendFormat("<td>{0}</td>", minDate.Day);
             minDate = minDate.AddDays();
         }
         else
         {
             sb.Append("<td></td>");
         }

         if (day == )
         {
             sb.Append("</tr><tr>");
             day = -;
         }

         day++;
     }
     sb.Append("</tr>");
     sb.Append("</tbody>");
     sb.Append("</table>");

     return sb.ToString();
 }

加上CSS后效果图：