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  • 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:

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  • 原文地址:https://www.cnblogs.com/LanTianYou/p/4439260.html
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