some lambda expression

books.Find(book=>book.Price<50);

1. x=>x+1
2. deleage(intx){returnx+1;}
3. //后面跟着的是语句块
4. x=>{returnx+1;}
5. delegate(intx){returnx+1;}
6. //输入参数也可以带类型，带类型后别忘记小括号哦
7. (intx)=>x+1
8. delegate(intx){returnx+1;}
9. //也可以多个输入参数，逗号分隔，别忘记小括号
10. (x,y)=>x+y
11. delegate(intx,inty){returnx+y;}
12. //无参的也行
14. ()=>1
16. delegate(){return1;}

Func<int> func1 = ()=> 1+1;

int result1 = func1();

ConstantExpression exp1 = Expression.Constant(1);

ConstantExpression exp2 = Expression.Constant(1);

BinaryExpression exp3 = Expression.Add(exp1, exp2);

Expression<Func<int>> exp4 = Expression.Lambda<Func<int>>(exp3);

Func<int> func = exp4.Compile();

int result = func();