多种时间验证方法

//Json方法
HttpContext.Current.Response.ContentType = "application/json";
DateTime[] times = BLL.Order.TimeBJManager.GetDateSchoolTime();
//times t1 = NowDT.   (dt2); //NowDT 早于 dt2，返回 -1
//times t2 = NowDT.CompareTo(dt1); //NowDT 晚于 dt1，返回 1
//times t3 = NowDT.CompareTo(dt2); //NowDT  ==  dt2，返回 0
if (NowDT.CompareTo(times[0]) < 0 || NowDT.CompareTo(times[1]) > 0)
{
//当前时间 早于开始时间
//当前时间 晚于结束时间
string json = "{\"StartTime\":\"" + times[0] + "\",\"EndTime\": \"" + times[1] + "\"}";
HttpContext.Current.Response.Write(json);
}
else
{
HttpContext.Current.Response.Write(null);
}

方法二：通过查询数据库，在数据库中比较时间 使用函数 CONVERT(data_type(length),data_to_be_converted,style)

DataTable dt=new DataTable();
/// <summary>
/// 时间验证
/// </summary>
/// <returns></returns>
[WebMethod]
public void Timeyanzheng()
{
StringBuilder strHtml = new StringBuilder();
DateTime NowDT = DateTime.Now;
dt = new BLL.list.Lists().list("SYS_APPConfig", "Id,type,convert(varchar(100),StartDate,23) as StartDate,convert(varchar(100),EndDate,23) as EndDate", "").Tables[0];
// DataSet ds = new BLL.list.Lists().list("SYS_APPConfig", "convert(varchar(100),StartDate,23) as StartDate,convert(varchar(100),EndDate,23) as EndDate", " type='学校端设置' and StartDate<'" + NowDT + "' and EndDate>'" + NowDT + "'");
DataRow[] dr = dt.Select("type='学校端设置' and StartDate<'" + NowDT + "' and EndDate>'" + NowDT + "'");
if (dr != null && dr.Length > 0)
{
HttpContext.Current.Response.Write("suc");
}
else
{
DataRow[] drControl = dt.Select(" type='学校端设置'");
strHtml.AppendFormat("<div><h3>学校预约时间为：{0}  ~   {1}</h3></div>", drControl[0]["StartDate"].ToString(), drControl[0]["EndDate"].ToString());
HttpContext.Current.Response.Write(strHtml.ToString());
}
}