扩展函数之 IsWhat 简单好用

代码实现：

/***扩展函数名细***/

//【IsInRange】
int num = ;
//以前写法
if (num >  & num < ) { }
//现在写法
if (num.IsInRange(, )) { } //datetime类型也支持

//【IsNullOrEmpty】
object s = "";
//以前写法
if (s == null || string.IsNullOrEmpty(s.ToString())) { }
//现在写法
if (s.IsNullOrEmpty()) { }
//更顺手了没有 }

//【IsIn】
string value = "a";
//以前写法我在很多项目中看到
if (value == "a" || value == "b" || value == "c") {
}
//现在写法
if (value.IsIn("a", "b", "c")) {

}

//【IsValuable与IsNullOrEmpty相反】
string ss = "";
//以前写法
if (!string.IsNullOrEmpty(ss)) { }
//现在写法
if (s.IsValuable()) { }

List<string> list = null;
//以前写法
if (list != null && list.Count > ) { }
//现在写法
if (list.IsValuable()) { }

//IsIDcard
if ("32061119810104311x".IsIDcard())
{

}

//IsTelephone
if ("0513-85669884".IsTelephone())
{

}

//IsMatch 节约你引用Regex的命名空间了
if ("我中国人12".IsMatch(@"人\d{2}")) { }

//下面还有很多太简单了的就不介绍了
//IsZero
//IsInt
//IsNoInt
//IsMoney
//IsEamil
//IsMobile

封装类：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;

namespace SyntacticSugar
{
    /// <summary>
    /// ** 描述：逻辑判段是什么？
    /// ** 创始时间：2015-5-29
    /// ** 修改时间：-
    /// ** 作者：sunkaixuan
    /// ** 使用说明：http://www.cnblogs.com/sunkaixuan/p/4539654.html
    /// </summary>
    public static class IsWhat
    {
        /// <summary>
        /// 值在的范围？
        /// </summary>
        /// <param name="o"></param>
        /// <param name="begin">大于等于begin</param>
        /// <param name="end">小于等于end</param>
        /// <returns></returns>
        public static bool IsInRange(this int o, int begin, int end)
        {
            return o >= begin && o <= end;
        }
        /// <summary>
        /// 值在的范围？
        /// </summary>
        /// <param name="o"></param>
        /// <param name="begin">大于等于begin</param>
        /// <param name="end">小于等于end</param>
        /// <returns></returns>
        public static bool IsInRange(this DateTime o, DateTime begin, DateTime end)
        {
            return o >= begin && o <= end;
        }

        /// <summary>
        /// 在里面吗?
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="o"></param>
        /// <param name="values"></param>
        /// <returns></returns>
        public static bool IsIn<T>(this T o, params T[] values)
        {
            return values.Contains(o);
        }

        /// <summary>
        /// 是null或""?
        /// </summary>
        /// <returns></returns>
        public static bool IsNullOrEmpty(this object o)
        {
            if (o == null || o == DBNull.Value) return true;
            return o.ToString() == "";
        }
        /// <summary>
        /// 是null或""?
        /// </summary>
        /// <returns></returns>
        public static bool IsNullOrEmpty(this Guid? o)
        {
            if (o == null) return true;
            return o == Guid.Empty;
        }
        /// <summary>
        /// 是null或""?
        /// </summary>
        /// <returns></returns>
        public static bool IsNullOrEmpty(this Guid o)
        {
            if (o == null) return true;
            return o == Guid.Empty;
        }

        /// <summary>
        /// 有值?(与IsNullOrEmpty相反)
        /// </summary>
        /// <returns></returns>
        public static bool IsValuable(this object o)
        {
            if (o == null) return false;
            return o.ToString() != "";
        }
        /// <summary>
        /// 有值?(与IsNullOrEmpty相反)
        /// </summary>
        /// <returns></returns>
        public static bool IsValuable(this IEnumerable<object> o)
        {
            if (o == null || o.Count() == ) return false;
            return true;
        }

        /// <summary>
        /// 是零?
        /// </summary>
        /// <param name="o"></param>
        /// <returns></returns>
        public static bool IsZero(this object o)
        {
            return (o == null || o.ToString() == "");
        }

        /// <summary>
        /// 是INT?
        /// </summary>
        /// <param name="o"></param>
        /// <returns></returns>
        public static bool IsInt(this object o)
        {
            if (o == null) return false;
            return Regex.IsMatch(o.ToString(), @"^\d+$");
        }
        /// <summary>
        /// 不是INT?
        /// </summary>
        /// <param name="o"></param>
        /// <returns></returns>
        public static bool IsNoInt(this object o)
        {
            if (o == null) return true;
            return !Regex.IsMatch(o.ToString(), @"^\d+$");
        }

        /// <summary>
        /// 是金钱?
        /// </summary>
        /// <param name="o"></param>
        /// <returns></returns>
        public static bool IsMoney(this object o)
        {
            if (o == null) return false;
            double outValue = ;
            return double.TryParse(o.ToString(), out outValue);
        }

        /// <summary>
        /// 是邮箱?
        /// </summary>
        /// <param name="o"></param>
        /// <returns></returns>
        public static bool IsEamil(this object o)
        {
            if (o == null) return false;
            return Regex.IsMatch(o.ToString(), @"^[\w-]+(\.[\w-]+)*@[\w-]+(\.[\w-]+)+$");
        }

        /// <summary>
        /// 是手机?
        /// </summary>
        /// <param name="o"></param>
        /// <returns></returns>
        public static bool IsMobile(this object o)
        {
            if (o == null) return false;
            return Regex.IsMatch(o.ToString(), @"^\d{11}$");
        }

        /// <summary>
        /// 是座机?
        /// </summary>
        public static bool IsTelephone(this object o)
        {
            if (o == null) return false;
            return System.Text.RegularExpressions.Regex.IsMatch(o.ToString(), @"^(\(\d{3,4}\)|\d{3,4}-|\s)?\d{8}$");

        }

        /// <summary>
        /// 是身份证?
        /// </summary>
        /// <param name="o"></param>
        /// <returns></returns>
        public static bool IsIDcard(this object o)
        {
            if (o == null) return false;
            return System.Text.RegularExpressions.Regex.IsMatch(o.ToString(), @"^(\d{15}$|^\d{18}$|^\d{17}(\d|X|x))$");
        }

        /// <summary>
        ///是适合正则匹配?
        /// </summary>
        /// <param name="o"></param>
        /// <param name="begin">大于等于begin</param>
        /// <param name="end">小于等于end</param>
        /// <returns></returns>
        public static bool IsMatch(this object o, string pattern)
        {
            if (o == null) return false;
            Regex reg = new Regex(pattern);
            return reg.IsMatch(o.ToString());
        }
    }
}