好东西都需要人去整理、分类

注意：需要引用命名空间 SyntacticSugar

用法：

/***扩展函数名细***/ //【IsInRange】 int num = 100; //以前写法 if (num > 100 & num < 1000) { } //现在写法 if (num.IsInRange(100, 1000)) { } //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 > 0) { } //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

源码：

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 /// </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() == 0) 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() == "0"); } /// <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 = 0; 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)"); } /// <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()); } } }