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: