using?System;
using?System.Collections.Generic;
using?System.Linq;
using?System.Text;
using?System.Text.Regularexpressions;
using?System.Threading.Tasks;

namespace?System
{
????public?static?class?StringExtention
????{
????????public?static?int?ToInt（this?string?value）
????????{
????????????int?result?=?0;
????????????int.TryParse（value?out?result）;
????????????return?result;
????????}

????????public?static?bool?IsEmail（this?string?_input）
????????{
????????????return?Regex.IsMatch（_input?@“^\w+@\w+\.\w+$“）;
????????}

????????public?static?bool?IsDateTime（this?string?value）
????????{
????????????bool?rst?=?false;
????????????try
????????????{
????????????????DateTime?dateTime?=?DateTime.Now;
????????????????rst?=?DateTime.TryParse（value?out?dateTime）;
????????????}
????????????catch
????????????{?}
????????????return?rst;
????????}

????????public?static?string?FormatDate（this?string?value?string?format）
????????{
????????????string?rst?=?““

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????文件????????3230??2019-12-09?10:38??StringExtention.cs