委托,Lambda的几种用法 Codeint[] numbers = { 5, 4, 1, 3, 9, 8, 6, 7, 2, 0 }; 对此数组进行查询,查询小于5的数: 方法1:( 使用查询表达式) var lowNus = from n in numbers where n < 5 select n; 方法2 :var lowNus = numbers.Where(n => n < 5); 方法3:var lowNus = numbers.Where(delegate(int n) { return n < 5; }); 方法4: Func<int, bool> ourfunc = delegate(int n) { return n < 5; }; var lowNus = numbers.Where(ourfunc); 方法5: Func<int, bool> myfunc = n => n < 5; var lowNus = numbers.Where(myfunc ); 方法6: Expression<Func<int, bool>> exp = n => n < 5; var lowNus = numbers.Where(exp.Compile()); 以上方法的输出结果: 4,1,3,2,0