C#动态匿名函数用法示例

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication2
{
  public class Temp
  {
    public string name { get; set; }
    public int value { get; set; }
  }

  class Program
  {
    static void Main(string[] args)
    {
      List<Temp>  list = new List<Temp>();  //假定这是来自其他某函数的返回值，一个很长的list

      var resultList = new List<Temp>() { };

      bool a = RandomTF();

      //Func<bool, Temp> test = null;

      Predicate<Temp> match;
      if (a)
      {
        match = temp => temp.value > 0;
      }
      else
      {
        match = temp => temp.value > 0 && temp.name.Length > 3;
      }

      resultList = list.FindAll(match);

      var b = resultList;
    }


    private static bool RandomTF()
    {
      Random r = new Random();
      var a = r.Next(1,10);
      return a % 2 == 0;
    }
  }
}