src/DotNetCommon.Core/Ensure.cs

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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using DotNetCommon.Extensions;

namespace DotNetCommon
{
    /// <summary>
    /// 当条件不满足时将抛出 <see langword="throw"/> 异常的Helper类。
    /// </summary>
    /// <remarks>常用在单元测试或参数合法性校验中</remarks>
    public static class Ensure
    {
        /// <summary>
        /// 确保给定表达式为 <see langword="true"/>.
        /// </summary>
        /// <typeparam name="TException">引发的异常类型</typeparam>
        /// <param name="condition">测试/确保条件</param>
        /// <param name="message">异常消息</param>
        /// <exception>
        ///     当<cref>TException</cref> <paramref name="condition"/> is <see langword="false"/>时抛出。
        /// </exception>
        public static void That<TException>(bool condition, string message = "给定条件为false。") where TException : Exception
        {
            if (!condition) { throw (TException)Activator.CreateInstance(typeof(TException), message); }
        }

        /// <summary>
        /// 确保给定<paramref name="condition"/>是<see langword="true"/>。
        /// </summary>
        /// <param name="condition">测试条件</param>
        /// <param name="message">异常消息</param>
        /// <exception cref="ArgumentException">
        ///     当<paramref name="condition"/>为<see langword="false"/>时抛出。
        /// </exception>
        public static void That(bool condition, string message = "给定条件为false。") =>
            That<ArgumentException>(condition, message);

        /// <summary>
        /// 确保给定<paramref name="condition"/>是<see langword="false"/>。
        /// </summary>
        /// <typeparam name="TException">引发的异常类型</typeparam>
        /// <param name="condition">测试条件</param>
        /// <param name="message">异常消息</param>
        /// <exception> 
        ///     当<paramref name="condition"/>为<see langword="false"/>时抛出。
        /// </exception>
        public static void Not<TException>(bool condition, string message = "给定条件为true。") where TException : Exception =>
            That<TException>(!condition, message);

        /// <summary>
        /// 确保给定<paramref name="condition"/>是<see langword="false"/>。
        /// </summary>
        /// <param name="condition">测试条件</param>
        /// <param name="message">异常消息</param>
        /// <exception cref="ArgumentException">
        ///     当<paramref name="condition"/>为<see langword="false"/>时抛出。
        /// </exception>