C# List.Exists()

List.Exists()：判断列表中是否有符合条件的元素。

using System.Collections;
using System.Collections.Generic;
using System.Linq;
using UnityEngine;

public class Test : MonoBehaviour
{
    /// <summary>
    /// 所有学生
    /// </summary>
    public List<Student> students = new List<Student>();

    private void Start()
    {
        //是否有年龄超过25岁的学生
        Debug.Log(ExistAgeOver25());
    }
    /// <summary>
    /// 是否有年龄超过25岁的学生
    /// </summary>
    bool ExistAgeOver25()
    {
        //写法1
        //return students.Exists((Student stu) => stu.age > 25 ? true : false);

        //写法2
        //return students.Exists((Student stu) => stu.age > 25);

        //写法3
        return students.Exists(stu => stu.age > 25);
    }
}
/// <summary>
/// 学生信息
/// </summary>
[System.Serializable]
public class Student
{
    /// <summary>
    /// 名字
    /// </summary>
    public string name;
    /// <summary>
    /// 年龄
    /// </summary>
    public int age;
    /// <summary>
    /// 学号
    /// </summary>
    public int id;
    /// <summary>
    /// 性别
    /// </summary>
    public Gender gender;

    public override string ToString()
    {
        return string.Format("{0}，{1}，{2}，{3}", name, age, id, gender == Gender.Female ? "女" : "男");
    }
}
/// <summary>
/// 性别
/// </summary>
public enum Gender
{
    /// <summary>
    /// 女性
    /// </summary>
    Female,
    /// <summary>
    /// 男性
    /// </summary>
    Male,
}