C# List 的FindALL方法和Sort方法的泛型委托参数用法参数用法

public List<T> FindAll(Predicate<T> match);

public void Sort(Comparison<T> comparison);

Predicate和Comparison是两个泛型委托。

在C#中还有其他的泛型委托如Action,Func,等

FindAll方法中可以在（）参数中设置自己的过滤方法

先讲Sort方法

	public class BaseUnit  {

        public int id;
        public int hp;
        public int force;

        public BaseUnit(int id,int hp,int force)
        {
            this.id = id;
            this.hp = hp;
            this.force = force;
        }
    }
}

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

namespace Core{
	public class DelegateGG : MonoBehaviour {

        void Start () {
            List<BaseUnit> targets = new List<BaseUnit>();
            targets.Add(new BaseUnit(1, 12, 13));
            targets.Add(new BaseUnit(2, 13, 14));
            targets.Add(new BaseUnit(3, 14, 14));
            this.RankUnit(targets, delegate (BaseUnit a, BaseUnit b) { return a.id.CompareTo(b.id); }, "根据id");
        }

        void Update () {

		}

        void RankUnit(List<BaseUnit> blist, Comparison<BaseUnit> compareDelegate, string biaoyu)
        {
            blist.Sort(compareDelegate);
            BaseUnit[] baseUnit = blist.ToArray();
            Debug.Log(biaoyu);
            foreach (var item in baseUnit)
            {
                Debug.Log(item.id);
            }
        }
    }
}

关键就是使用Comparison来设置一个比较的委托，这样设置的话，最终输出的结果是按照id从小到大排序。

FindAll方法

	public class DelegateGG : MonoBehaviour {

        void Start () {
            List<BaseUnit> targets = new List<BaseUnit>();
            targets.Add(new BaseUnit(1, 56, 13));
            targets.Add(new BaseUnit(2, 50, 14));
            targets.Add(new BaseUnit(3, 40, 14));
           List<BaseUnit> bsNew= targets.FindAll(delegate(BaseUnit bas){ return bas.hp <= 50; });
            foreach (var item in bsNew)
            {
                Debug.Log(item.hp);
            }
        }
        void Update()
        {
        }
        void RankUnit(List<BaseUnit> blist, Comparison<BaseUnit> compareDelegate, string biaoyu)
        {
            blist.Sort(compareDelegate);
            BaseUnit[] baseUnit = blist.ToArray();
            Debug.Log(biaoyu);
            foreach (var item in baseUnit)
            {
                Debug.Log(item.id);
            }
        }
    }
}