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/// <summary>
/// 选择委托
/// 返回数据类型T的属性Tkey的值
/// </summary>
/// <typeparam name="T">数据类型</typeparam>
/// <typeparam name="Tkey">数据类型T的字段</typeparam>
/// <returns>选择的属性</returns>
public delegate TKey SelectHandler<T, TKey>(T t);//注意是写在类外/// <summary>
/// 使用委托对任何数据类型数组进行升序排序
/// </summary>
/// <typeparam name="T">数据类型</typeparam>
/// <typeparam name="Tkey">数据类型T的字段</typeparam>
/// <param name="array">数据类型T的数组</param>
/// <param name="selectHandler">选择委托的对象</param>
public static void OrderBy<T, Tkey>(T[] array, SelectHandler<T, Tkey> selectHandler)where Tkey : IComparable<Tkey>
{for (int i = 0; i < array.Length; ++i){for (int j = i + 1; j < array.Length; ++j){//将委托已经取得数据类型的属性的进行比较if (selectHandler(array[i]).CompareTo(selectHandler(array[j])) > 0){T temp = array[i];array[i] = array[j];array[j] = temp;}}}
}/// <summary>
/// 使用委托对任何数据类型数组进行降序排序
/// </summary>
/// <typeparam name="T">数据类型</typeparam>
/// <typeparam name="Tkey">数据类型T的字段</typeparam>
/// <param name="array">数据类型T的数组</param>
/// <param name="selectHandler">选择委托的对象</param>
public static void OrderByDescending<T, Tkey>(T[] array, SelectHandler<T, Tkey> selectHandler)where Tkey : IComparable<Tkey>
{for (int i = 0; i < array.Length; ++i){for (int j = i + 1; j < array.Length; ++j){//将委托已经取得数据类型的属性的进行比较if (selectHandler(array[i]).CompareTo(selectHandler(array[j])) < 0){T temp = array[i];array[i] = array[j];array[j] = temp;}}}
}

/// <summary>
/// 查找最大值
/// </summary>
/// <typeparam name="T">数据类型</typeparam>
/// <typeparam name="Tkey">数据类型T的字段</typeparam>
/// <param name="array">数据类型T的数组</param>
/// <param name="selectHandler">选择委托的对象</param>
/// <returns>返回T类型的数组中字段Tkey最大的数据</returns>
public static T Max<T, Tkey>(T[] array, SelectHandler<T, Tkey> selectHandler)where Tkey : IComparable<Tkey>
{T temp = array[0];for (int i = 1; i < array.Length; ++i){//将委托已经取得数据类型的属性的进行比较if (selectHandler(temp).CompareTo(selectHandler(array[i])) < 0){temp = array[i];}}return temp;
}/// <summary>
/// 查找最小值
/// </summary>
/// <typeparam name="T">数据类型</typeparam>
/// <typeparam name="Tkey">数据类型T的字段</typeparam>
/// <param name="array">数据类型T的数组</param>
/// <param name="selectHandler">选择委托的对象</param>
/// <returns>返回T类型的数组中字段Tkey最大的数据</returns>
public static T Min<T, Tkey>(T[] array, SelectHandler<T, Tkey> selectHandler)where Tkey : IComparable<Tkey>
{T temp = array[0];for (int i = 1; i < array.Length; ++i){//将委托已经取得数据类型的属性的进行比较if (selectHandler(temp).CompareTo(selectHandler(array[i])) > 0){temp = array[i];}}return temp;
}

/// <summary>
/// 查找条件委托 表示一个查找条件
/// 数据t是否满足某个条件
/// </summary>
/// <typeparam name="T">数据类型</typeparam>
/// <param name="t">数据类型T的对象</param>
/// <returns>bool值</returns>
public delegate bool FindHandler<T>(T t);//注意是写在类外/// <summary>
/// 查找单个（第一个）满足条件的对象
/// </summary>
/// <typeparam name="T">数据类型</typeparam>
/// <param name="array">数据类型T的数组</param>
/// <param name="findHandler">查找条件委托</param>
/// <returns>返回第一个满足条件的类型为T的对象</returns>
public static T Find<T>(T[] array, FindHandler<T> findHandler)
{T temp = default;for (int i = 0; i < array.Length; ++i){if (findHandler(array[i])){return array[i];}}return temp;
}

/// <summary>
/// 查找满足条件的所有对象
/// </summary>
/// <typeparam name="T">数据类型</typeparam>
/// <param name="array">数据类型T的数组</param>
/// <param name="findHandler">查找条件委托</param>
/// <returns>返回 所有 满足条件的，类型为T的 对象</returns>
/// 
public static T[] FindAll<T>(T[] array, FindHandler<T> findHandler)
{List<T> res = new List<T>();for (int i = 0; i < array.Length; ++i){if (findHandler(array[i])){res.Add(array[i]);}}return res.ToArray();
}

/// <summary>
/// 选取数组中所有对象的某一字段
/// </summary>
/// <typeparam name="T">数据类型</typeparam>
/// <typeparam name="Tkey">数据类型T的字段</typeparam>
/// <param name="array">数据类型T的数组</param>
/// <param name="selectHandler">选择委托的对象</param>
/// <returns>返回数组中所有对象的某一字段组成的数组</returns>
public static Tkey[] Select<T, Tkey>(T[] array, SelectHandler<T, Tkey> selectHandler)
{Tkey[] res = new Tkey[array.Length];for (int i = 0; i < array.Length; ++i){res[i] = selectHandler(array[i]);}return res;
}

using System;
using System.Collections.Generic;/// <summary>
/// 选择委托
/// 返回数据类型T的属性Tkey的值
/// </summary>
/// <typeparam name="T">数据类型</typeparam>
/// <typeparam name="Tkey">数据类型T的字段</typeparam>
/// <returns>选择的属性</returns>
public delegate TKey SelectHandler<T, TKey>(T t);/// <summary>
/// 查找条件委托 表示一个查找条件
/// 数据t是否满足某个条件
/// </summary>
/// <typeparam name="T">数据类型</typeparam>
/// <param name="t">数据类型T的对象</param>
/// <returns>bool值</returns>
public delegate bool FindHandler<T>(T t);/// <summary>
/// 数组助手类
/// 排序:升序 降序
/// 查找:最大 最小 单个 全部...
/// </summary>
public static class ArrayHelper
{/// <summary>/// 升序排序(冒泡排序)/// 使用委托对任何数据类型数组进行排序/// </summary>/// <typeparam name="T">数据类型</typeparam>/// <typeparam name="Tkey">数据类型T的字段</typeparam>/// <param name="array">数据类型T的数组</param>/// <param name="selectHandler">选择委托的对象</param>public static void OrderBy<T, Tkey>(T[] array, SelectHandler<T, Tkey> selectHandler)where Tkey : IComparable<Tkey>{for (int i = 0; i < array.Length; ++i){for (int j = i + 1; j < array.Length; ++j){//将委托已经取得数据类型的属性的进行比较if (selectHandler(array[i]).CompareTo(selectHandler(array[j])) > 0){T temp = array[i];array[i] = array[j];array[j] = temp;}}}}/// <summary>/// 降序排序(冒泡排序)/// 使用委托对任何数据类型数组进行排序/// </summary>/// <typeparam name="T">数据类型</typeparam>/// <typeparam name="Tkey">数据类型T的字段</typeparam>/// <param name="array">数据类型T的数组</param>/// <param name="selectHandler">选择委托的对象</param>public static void OrderByDescending<T, Tkey>(T[] array, SelectHandler<T, Tkey> selectHandler)where Tkey : IComparable<Tkey>{for (int i = 0; i < array.Length; ++i){for (int j = i + 1; j < array.Length; ++j){//将委托已经取得数据类型的属性的进行比较if (selectHandler(array[i]).CompareTo(selectHandler(array[j])) < 0){T temp = array[i];array[i] = array[j];array[j] = temp;}}}}/// <summary>/// 查找最大值/// </summary>/// <typeparam name="T">数据类型</typeparam>/// <typeparam name="Tkey">数据类型T的字段</typeparam>/// <param name="array">数据类型T的数组</param>/// <param name="selectHandler">选择委托的对象</param>/// <returns>返回T类型的数组中字段Tkey最大的数据</returns>public static T Max<T, Tkey>(T[] array, SelectHandler<T, Tkey> selectHandler)where Tkey : IComparable<Tkey>{T temp = array[0];for (int i = 1; i < array.Length; ++i){//将委托已经取得数据类型的属性的进行比较if (selectHandler(temp).CompareTo(selectHandler(array[i])) < 0){temp = array[i];}}return temp;}/// <summary>/// 查找最小值/// </summary>/// <typeparam name="T">数据类型</typeparam>/// <typeparam name="Tkey">数据类型T的字段</typeparam>/// <param name="array">数据类型T的数组</param>/// <param name="selectHandler">选择委托的对象</param>/// <returns>返回T类型的数组中字段Tkey最大的数据</returns>public static T Min<T, Tkey>(T[] array, SelectHandler<T, Tkey> selectHandler)where Tkey : IComparable<Tkey>{T temp = array[0];for (int i = 1; i < array.Length; ++i){//将委托已经取得数据类型的属性的进行比较if (selectHandler(temp).CompareTo(selectHandler(array[i])) > 0){temp = array[i];}}return temp;}/// <summary>/// 查找（单个）第一个满足条件的对象/// </summary>/// <typeparam name="T">数据类型</typeparam>/// <param name="array">数据类型T的数组</param>/// <param name="findHandler">查找条件委托</param>/// <returns>返回第一个满足条件的类型为T的对象</returns>public static T Find<T>(T[] array, FindHandler<T> findHandler){T temp = default;for (int i = 0; i < array.Length; ++i){if (findHandler(array[i])){return array[i];}}return temp;}/// <summary>/// 查找所有满足条件的对象/// </summary>/// <typeparam name="T">数据类型</typeparam>/// <param name="array">数据类型T的数组</param>/// <param name="findHandler">查找条件委托</param>/// <returns>返回所有满足条件的类型为T的对象</returns>/// public static T[] FindAll<T>(T[] array, FindHandler<T> findHandler){List<T> res = new List<T>();for (int i = 0; i < array.Length; ++i){if (findHandler(array[i])){res.Add(array[i]);}}return res.ToArray();}/// <summary>/// 选取数组中所有对象的某一字段/// </summary>/// <typeparam name="T">数据类型</typeparam>/// <typeparam name="Tkey">数据类型T的字段</typeparam>/// <param name="array">数据类型T的数组</param>/// <param name="selectHandler">选择委托的对象</param>/// <returns>返回数组中所有对象的某一字段组成的数组</returns>public static Tkey[] Select<T, Tkey>(T[] array, SelectHandler<T, Tkey> selectHandler){Tkey[] res = new Tkey[array.Length];for (int i = 0; i < array.Length; ++i){res[i] = selectHandler(array[i]);}return res;}
}

using System;
using UnityEngine;namespace ArrayHelperTest
{public class ArrayHelperTest : MonoBehaviour{public void Start(){int[] intArray = { 4, 1, 5, 0 };string[] stringArray = { "2", "a", "ab", "hello", "0" };Student[] studentArray ={new Student(){ Id=1001,Name="张三",Age=20 },new Student(){ Id=1003,Name="李四",Age=18 },new Student(){ Id=1002,Name="赵六",Age=21 },new Student(){ Id=1000,Name="王五",Age=19 },new Student(){ Id=1004,Name="孙七",Age=18 }};//查找//1）查找最值：最大值，最小值FindMaxAndMinTest<int, int>(intArray, value => value );FindMaxAndMinTest<string, string>(stringArray, value => value);FindMaxAndMinTest<Student, int>(studentArray, student => student.Id);FindMaxAndMinTest<Student, string>(studentArray, student => student.Name);//2）查找满足条件的单个对象(第一个)ArrayHelper.Find<int>(intArray, value => value > 0);ArrayHelper.Find<string>(stringArray, value => value == "a");ArrayHelper.Find<Student>(studentArray, student => student.Age==18);//3）查找满足条件的所有对象Student[] students = ArrayHelper.FindAll<Student>(studentArray, student => student.Age == 18);string studentStr = "";foreach (var student in students){studentStr += student.Id + " " + student.Name + " " + student.Age + "\n";}Debug.Log(studentStr);//4）选取数组中所有对象的某一字段string[] names= ArrayHelper.Select<Student,string>(studentArray, student => student.Name);string nameStr = "";foreach (var name in names){nameStr += name+" ";}Debug.Log(nameStr);}private void FindMaxAndMinTest<T, Tkey>(T[] array, SelectHandler<T, Tkey> selectHandler) where Tkey : IComparable<Tkey>{Debug.Log(array.GetType() + "测试：\n"+"最小值：" + ArrayHelper.Min<T, Tkey>(array, selectHandler)+" 最大值：" + ArrayHelper.Max<T, Tkey>(array, selectHandler));}}public class Student{public int Id { get; set; }public string Name { get; set; }public int Age { get; set; }}
}