C#中分别对委托、匿名方法、Lambda表达式、Lambda表达式树以及反射执行同一方法的过程进行比较。

C#中分别对委托、匿名方法、Lambda表达式、Lambda表达式树以及反射执行同一方法的过程进行比较。

 

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

namespace INPEXOne.LearnCS
{
    class RefletLambdaDelegate
    {
        static object[] parameters = new object[] { 1, 2 };
        public delegate int addDelegate(int a, int b);

        public int add(int a ,int b) 
        {
            return a + b;
        }

        public static void Main() 
        {
            RefletLambdaDelegate rld=new RefletLambdaDelegate();       
            //利用反射调用add方法.
            MethodInfo add = typeof(RefletLambdaDelegate).GetMethod("add");
            Console.WriteLine("The add result from using the reflection is : {0}",add.Invoke(rld, parameters));

            //利用Lambda表达式树调用add方法.
            Expression<Func<int, int, int>> extree = (a,b) => rld.add(a, b);
            Func<int, int, int> delinstance = extree.Compile();
            int result = delinstance(int.Parse(parameters[0].ToString()), int.Parse(parameters[1].ToString()));
            Console.WriteLine("The add result from using the LambdaTree is : {0}",result);

            //利用Lambda表达式调用add方法.
            Func<int, int, int> addLambda = (c, d) => rld.add(c, d);
            int result1 = addLambda(int.Parse(parameters[0].ToString()), int.Parse(parameters[1].ToString()));
            Console.WriteLine("The add result from using the Lambda without tree is : {0}",result1);

            //利用委托调用add方法.
            addDelegate addDelgateInstance = new addDelegate(rld.add);
            int result2 = addDelgateInstance(int.Parse(parameters[0].ToString()), int.Parse(parameters[1].ToString()));
            Console.WriteLine("The add result from using the delegate is : {0}", result2);

            //利用匿名方法调用add方法.
            addDelegate AnonymousInstance = delegate(int a, int b) { return rld.add(a,b); };
            int result3 = AnonymousInstance(int.Parse(parameters[0].ToString()), int.Parse(parameters[1].ToString()));
            Console.WriteLine("The add result from using the anonymous method is : {0}", result3);
            Console.ReadLine();
        }
    }
}

以上代码分别对委托、匿名方法、Lambda表达式、Lambda表达式树以及反射执行同一方法的过程进行比较，输出结果为：