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Item 3: Prefer the is or as Operators to Casts 第3项: 优先使用is/as进行类型转换
Object o = new Object();
Boolean b1 = (o is Object); //b1为true Boolean b2 = (o is Person); //b2为false
object o = Factory.GetObject( );
MyType t = o as MyType; if ( t != null ) { // work with t, it's a MyType. } else { // report the failure. }
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