需要根据选择值计算年龄 [英] Need to calculate the age from the select value

问题描述

private void Page_Load(object sender, EventArgs e)
       {
           if (!IsPostBack)
           {
               ddlMonth.DataSource = Enumerable.Range(1, 12).Select(a => new
               {
                   MonthName = DateTimeFormatInfo.CurrentInfo.GetMonthName(a),
                   MonthNumber = a
                   //DataTextField = DateTimeFormatInfo.CurrentInfo.GetMonthName(a),
                   //DataValueField = a
               }
               );

               //If this code is not working then try the above code in the loop.
               ddlMonth.DataTextField = "MonthName";
               ddlMonth.DataValueField = "MonthNumber";

               ddlMonth.DataBind();
               ddlYear.DataSource = Enumerable.Range(DateTime.Now.Year - 99, 100).Reverse();
               ddlYear.DataBind();
               ddlday.DataSource = Enumerable.Range(1, DateTime.DaysInMonth(DateTime.Now.Year, Convert.ToInt32(ddlMonth.SelectedValue)));
               ddlday.DataBind();
           }
       }
       protected void ddlMonth_SelectedIndexChanged(object sender, EventArgs e)
       {
           ddlday.DataSource = Enumerable.Range(1, DateTime.DaysInMonth(DateTime.Now.Year, Convert.ToInt32(ddlMonth.SelectedIndex + 1))); ddlday.DataBind();
       }
   }

推荐答案

如果您希望逻辑希望对您有所帮助:

If you want the logic hope this will help you:http://stackoverflow.com/questions/9/calculating-age-from-birthday[^]

System.DateTime date1 = new System.DateTime(2012, 1, 1);
System.DateTime date2 = System.DateTime.Now.Date;
// diff1 gets 242 days
System.TimeSpan diff1 = date2.Subtract(date1);

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