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  • C#教程之C#教程之参数验证一种方式

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  1. 在调用方法的时候我们需要对输入参数进行验证，譬如非空，只能数字类型等；

  2. 一些参数验证都是非常通用的，所以可以累积后续不断完善；

  3. 这种写法源于之前很早看到一篇博客后续完善，具体地址忘记了，所以现在Github项目采用协议:MIT，非常抱歉；

  4. GitHub地址：MasterChief 参数验证代码

  5. 欢迎Star，欢迎Issues；

1. 代码实现#




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using System; using System.IO; using System.Text.RegularExpressions; using MasterChief.DotNet4.Utilities.Common; using MasterChief.DotNet4.Utilities.Model; namespace MasterChief.DotNet4.Utilities.Operator { /// <summary> /// 参数验证帮助类 /// </summary> public static class ValidateOperator { #region Methods /// <summary> /// 验证初始化 /// </summary> /// <returns>Validation</returns> public static Validation Begin() { return null; } /// <summary> /// 需要验证的正则表达式 /// </summary> /// <param name="validation">Validation</param> /// <param name="checkFactory">委托</param> /// <param name="pattern">正则表达式</param> /// <param name="argumentName">参数名称</param> /// <returns>Validation</returns> public static Validation Check(this Validation validation, Func<bool> checkFactory, string pattern, string argumentName) { return Check<ArgumentException>(validation, checkFactory, string.Format(ValidateResource.ParameterCheck_Match2, argumentName)); } /// <summary> /// 自定义参数检查 /// </summary> /// <typeparam name="TException">泛型</typeparam> /// <param name="validation">Validation</param> /// <param name="checkedFactory">委托</param> /// <param name="message">自定义错误消息</param> /// <returns>Validation</returns> /// 时间：2016/7/19 11:37 /// 备注： public static Validation Check<TException>(this Validation validation, Func<bool> checkedFactory, string message) where TException : Exception { if (checkedFactory()) return validation ?? new Validation { IsValid = true }; var exception = (TException) Activator.CreateInstance(typeof(TException), message); throw exception; } /// <summary> /// 检查指定路径的文件夹必须存在，否则抛出<see cref="DirectoryNotFoundException" />异常。 /// </summary> /// <param name="validation">Validation</param> /// <param name="data">判断数据</param> /// <exception cref="ArgumentNullException">ArgumentNullException</exception> /// <exception cref="DirectoryNotFoundException">DirectoryNotFoundException</exception> /// <returns>Validation</returns> public static Validation CheckDirectoryExist(this Validation validation, string data) { return Check<DirectoryNotFoundException>(validation, () => Directory.Exists(data), string.Format(ValidateResource.ParameterCheck_DirectoryNotExists, data)); } /// <summary> /// 检查文件类型 /// </summary> /// <param name="validation">Validation</param> /// <param name="actualFileExt">实际文件类型；eg: .xls</param> /// <param name="expectFileExt">期待文件类型</param> /// <returns></returns> public static Validation CheckedFileExt(this Validation validation, string actualFileExt, string[] expectFileExt) { var allowFileExts = expectFileExt.ToString(","); return Check<FileNotFoundException>(validation, () => expectFileExt.ContainIgnoreCase(actualFileExt), string.Format(ValidateResource.ParameterCheck_FileExtCompare, allowFileExts)); } /// <summary> /// 检查文件类型 /// </summary> /// <param name="validation">Validation</param> /// <param name="actualFileExt">实际文件类型；eg: .xls</param> /// <param name="expectFileExt">期待文件类型</param> /// <returns></returns> public static Validation CheckedFileExt(this Validation validation, string actualFileExt, string expectFileExt) { return Check<FileNotFoundException>(validation, () => actualFileExt.CompareIgnoreCase(expectFileExt), string.Format(ValidateResource.ParameterCheck_FileExtCompare, expectFileExt)); } /// <summary> /// 检查指定路径的文件必须存在，否则抛出<see cref="FileNotFoundException" />异常。 /// </summary> /// <param name="validation">Validation</param> /// <param name="data">参数</param> /// <exception cref="ArgumentNullException">当文件路径为null时</exception> /// <exception cref="FileNotFoundException">当文件路径不存在时</exception> /// <returns>Validation</returns> public static Validation CheckFileExists(this Validation validation, string data) { return Check<FileNotFoundException>(validation, () => File.Exists(data), string.Format(ValidateResource.ParameterCheck_FileNotExists, data)); } /// <summary> /// 检查参数必须大于[或可等于，参数canEqual]指定值，否则抛出<see cref="ArgumentOutOfRangeException" />异常。 /// </summary> /// <typeparam name="T">参数类型。</typeparam> /// <param name="validation">Validation</param> /// <param name="value">判断数据</param> /// <param name="paramName">参数名称。</param> /// <param name="target">要比较的值。</param> /// <param name="canEqual">是否可等于。</param> /// <exception cref="ArgumentOutOfRangeException">ArgumentOutOfRangeException</exception> /// <returns>Validation</returns> public static Validation CheckGreaterThan<T>(this Validation validation, T value, string paramName, T target, bool canEqual) where T : IComparable<T> { // bool flag = canEqual ? value.CompareTo(target) >= 0 : value.CompareTo(target) > 0; var format = canEqual ? ValidateResource.ParameterCheck_NotGreaterThanOrEqual : ValidateResource.ParameterCheck_NotGreaterThan; return Check<ArgumentOutOfRangeException>(validation, () => canEqual ? value.CompareTo(target) >= 0 : value.CompareTo(target) > 0, string.Format(format, paramName, target)); } /// <summary> /// 检查参数必须小于[或可等于，参数canEqual]指定值，否则抛出<see cref="ArgumentOutOfRangeException" />异常。 /// </summary> /// <typeparam name="T">参数类型。</typeparam> /// <param name="validation">Validation</param> /// <param name="value">判断数据</param> /// <param name="paramName">参数名称。</param> /// <param name="target">要比较的值。</param> /// <param name="canEqual">是否可等于。</param> /// <exception cref="ArgumentOutOfRangeException">ArgumentOutOfRangeException</exception> /// <returns>Validation</returns> public static Validation CheckLessThan<T>(this Validation validation, T value, string paramName, T target, bool canEqual) where T : IComparable<T> { var format = canEqual ? ValidateResource.ParameterCheck_NotLessThanOrEqual : ValidateResource.ParameterCheck_NotLessThan; return Check<ArgumentOutOfRangeException>(validation, () => canEqual ? value.CompareTo(target) <= 0 : value.CompareTo(target) < 0, string.Format(format, paramName, target)); } /// <summary> /// 验证是否在范围内 /// </summary> /// <param name="validation">Validation</param> /// <param name="data">输入项</param> /// <param name="min">最小值</param> /// <param name="max">最大值</param> /// <param name="argumentName">参数名称</param> /// <returns>Validation</returns> public static Validation InRange(this Validation validation, int data, int min, int max, string argumentName) { return Check<ArgumentOutOfRangeException>(validation, () => data >= min && data <= max, string.Format(ValidateResource.ParameterCheck_Between, argumentName, min, max)); } /// <summary> /// 是否是中文 /// </summary> /// <param name="validation">Validation</param> /// <param name="data">中文</param> /// <param name="argumentName">参数名称</param> /// <returns>Validation</returns> public static Validation IsChinses(this Validation validation, string data, string argumentName) { return Check(validation, () => CheckHelper.IsChinses(data), RegexPattern.ChineseCheck, argumentName); } /// <summary> /// 是否是电子邮箱 /// </summary> /// <param name="validation">Validation</param> /// <param name="email">需要验证的邮箱</param> /// <param name="argumentName">参数名称</param> /// <returns>Validation</returns> public static Validation IsEmail(this Validation validation, string email, string argumentName) { return Check(validation, () => CheckHelper.IsEmail(email), RegexPattern.EmailCheck, argumentName); } /// <summary> /// 是否是文件路径 /// </summary> /// <param name="validation">Validation</param> /// <param name="data">路径</param> /// <returns>Validation</returns> public static Validation IsFilePath(this Validation validation, string data) { return Check<ArgumentException>(validation, () => CheckHelper.IsFilePath(data), string.Format(ValidateResource.ParameterCheck_IsFilePath, data)); } /// <summary> /// 是否是十六进制字符串 /// </summary> /// <param name="validation">Validation</param> /// <param name="data">验证数据</param> /// <param name="argumentName">参数名称</param> /// <returns>Validation</returns> public static Validation IsHexString(this Validation validation, string data, string argumentName) { return Check(validation, () => CheckHelper.IsHexString(data), RegexPattern.HexStringCheck, argumentName); } /// <summary> /// 是否是身份证号码 /// </summary> /// <param name="validation">Validation</param> /// <param name="data">验证数据</param> /// <param name="argumentName">参数名称</param> /// <returns>Validation</returns> public static Validation IsIdCard(this Validation validation, string data, string argumentName) { return Check(validation, () => CheckHelper.IsIdCard(data), RegexPattern.IdCardCheck, argumentName); } /// <summary> /// 是否是整数 /// </summary> /// <param name="validation">Validation</param> /// <param name="data">需要检测的字符串</param> /// <param name="argumentName">参数名称</param> /// <returns>Validation</returns> public static Validation IsInt(this Validation validation, string data, string argumentName) { return Check(validation, () => CheckHelper.IsInt(data), RegexPattern.IntCheck, argumentName); } /// <summary> /// 是否是IP /// </summary> /// <param name="validation">Validation</param> /// <param name="data">需要检测到IP</param> /// <param name="argumentName">参数名称</param> /// <returns>Validation</returns> public static Validation IsIp(this Validation validation, string data, string argumentName) { return Check(validation, () => CheckHelper.IsIp4Address(data), RegexPattern.IpCheck, argumentName); } /// <summary> /// 是否是数字 /// </summary> /// <param name="validation">Validation</param> /// <param name="data">需要检测的字符串</param> /// <param name="argumentName">参数名称</param> /// <returns>Validation</returns> public static Validation IsNumber(this Validation validation, string data, string argumentName) { return Check(validation, () => CheckHelper.IsNumber(data), RegexPattern.NumberCheck, argumentName); } /// <summary> /// 是否是合法端口 /// </summary> /// <param name="validation">Validation</param> /// <param name="data">参数值</param> /// <param name="paramName">参数名称</param> /// <returns>Validation</returns> public static Validation IsPort(this Validation validation, string data, string paramName) { return Check<ArgumentException>(validation, () => CheckHelper.IsValidPort(data), string.Format(ValidateResource.ParameterCheck_Port, paramName)); } /// <summary> /// 是否是邮政编码 /// </summary> /// <param name="validation">Validation</param> /// <param name="data">邮政编码</param> /// <param name="argumentName">参数名称</param> /// <returns>Validation</returns> public static Validation IsPoseCode(this Validation validation, string data, string argumentName) { return Check(validation, () => CheckHelper.IsPoseCode(data), RegexPattern.PostCodeCheck, argumentName); } /// <summary> /// 判断字符串是否是要求的长度 /// </summary> /// <param name="validation">Validation</param> /// <param name="input">验证的字符串</param> /// <param name="requireLength">要求的长度</param> /// <param name="argumentName">参数名称</param> /// <returns>Validation</returns> public static Validation IsRequireLen(this Validation validation, string input, int requireLength, string argumentName) { return Check<ArgumentException>( validation, () => input.Length == requireLength, string.Format(ValidateResource.ParameterCheck_StringLength, argumentName, requireLength)); } /// <summary> /// 判断类型是否能序列化 /// </summary> /// <param name="validation">Validation</param> /// <param name="data">输入项</param> /// <returns>Validation</returns> /// 时间：2016-01-14 9:57 /// 备注： public static Validation IsSerializable(this Validation validation, object data) { return Check<ArgumentException>(validation, () => data.GetType().IsSerializable, $"该参数类型{data.GetType().FullName}不能序列化！"); } /// <summary> /// 是否是URL /// </summary> /// <param name="validation">Validation</param> /// <param name="data">url</param> /// <param name="argumentName">参数名称</param> /// <returns>Validation</returns> public static Validation IsUrl(this Validation validation, string data, string argumentName) { return Check(validation, () => CheckHelper.IsURL(data), RegexPattern.UrlCheck, argumentName); } /// <summary> /// 验证参数不能等于某个值 /// </summary> /// <param name="validation">Validation</param> /// <param name="data">输入项</param> /// <param name="equalObj">比较项</param> /// <param name="argumentName">参数名称</param> /// <returns>Validation</returns> public static Validation NotEqual(this Validation validation, object data, object equalObj, string argumentName) { return Check<ArgumentException>(validation, () => data != equalObj, string.Format(ValidateResource.ParameterCheck_NotEqual, argumentName, data)); } /// <summary> /// 验证非空 /// </summary> /// <param name="validation">Validation</param> /// <param name="data">输入项</param> /// <param name="argumentName">参数名称</param> /// <returns>Validation</returns> public static Validation NotNull(this Validation validation, object data, string argumentName) { return Check<ArgumentNullException>(validation, () => CheckHelper.NotNull(data), string.Format(ValidateResource.ParameterCheck_NotNull, argumentName)); } /// <summary> /// 不能为空或者NULL验证 /// </summary> /// <param name="validation">Validation</param> /// <param name="input">输入项</param> /// <param name="argumentName">参数名称</param> /// <returns>















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