As is,where
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Asis,whereAsis,whereAsis,where返回true和false.如果一个对象是某个类型或是其父类型的话就返回为true,否则的话就会返回为false.另外is操作符永远不会抛出异
As is,where
As is,where
As is,where
返回true和false.如果一个对象是某个类型或是其父类型的话就返回为true,否则的话就会返回为false.另外is操作符永远不会抛出异常.代码如下：\x0dSystem.Boolean b1 = (o is System.Object);//b1 为true\x0dSystem.Boolean b2 = (o is Employee);//b2为false如果对象引用为null,那么is操作符总是返回为false,因为没有对象可以检查其类型,就像下面代码一样\x0dif(o is Employee) {\x0dEmployee e = (Employee) o;\x0d//在if语句中使用e\x0d}在上面代码中,其实clr对对象类型检查了两次：is操作首先检查o所引用的对象是否和employee类型兼容.如果兼容,那么在if语句内clr在执行转换时又会检查o是否为一个Employee引用.这种编程范式十分常见,c#便提供了一种新的类型检查,转换方式.即as操作符,他可以在简化代码的同时,提高性能.代码如下：\x0dEmployee e = o as Employee;\x0dif(e != null){//在if语句中使用e\x0d}这种as操作即便等同于上面代码,同时只进行了1次的类型检查,所以提高了性能.
As is,where
价格后面 加 As is where is
a reading room is where you can read newspapers and magazines as well as books.为什么用where,能不能换成the place where,那又是为什么》
Where are Where is
Excuse me,but where is the no.12 street?well,it is( )the bus gose.A as long as ...Excuse me,but where is the no.12 street?well,it is( )the bus gose.A as long as B as much as C as far as D as many as为什么选C
Is that the country _____ English is spoken as a second language?用where引导吗
Is that the country, _____ English is spoken as a second language?用where引
Life is one fool thing after another where as love is two fool things after each
As the saying goes,Where there is a will,there is way. 汉语意思是什么
there is no simple answer (as)is often the case inscience.为什么不能用where
As with runing,studing needs will.Where there is a will ,there is a way..
As with runing,studing needs will.Where there is a will ,there is a way.
water is very useful.Do you know where the water is?Write down as many as possible .
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