The role of the c#is operator

The meaning of the IS operator: checks if the object is not a given type, or whether it can be converted to a given type, and if so, this operator returns TRUE.

Syntax for the IS operator:<operand> is <type>

The result of this expression is as follows: If <type> is a class type, and <operand> is the type, or it inherits the type, or it can be marshaled to that type, the result returns TRUE.

If <type> is an interface type, and <operand> is the type, or if it is the type that implements the interface, the result returns TRUE.

Returns True if <type> is a value type, and <operand> is the type, or it can be disassembled into that type.

is instance:

1 namespaceChapter112 {3     classChecker4     {5          Public voidCheck (Objectparam1)6         {7             if(param1 isClassA)8Console.WriteLine ("Variable can converted to ClassA");9             ElseTenConsole.WriteLine ("Variable can ' t is converted to ClassA."); One  A             if(param1 isimyinterface) -Console.WriteLine ("Variable can converted to IMyInterface."); -             Else theConsole.WriteLine ("Variable can ' t converted to imyinterface."); -  -             if(param1 ismystruct) -Console.WriteLine ("Variable can converted to MyStruct."); +             Else -Console.WriteLine ("Variable can ' t is converted to MyStruct."); +         } A     } at     InterfaceIMyInterface -     { } -     classClassa:imyinterface -     { } -     classClassb:imyinterface -     { } in  -     classClassC to     { } +  -     classClassd:classa the     { } *  $     structMystruct:imyinterfacePanax Notoginseng     { } -     class Program the     { +         Static voidMain (string[] args) A         { theChecker check =NewChecker (); +ClassA Try1 =NewClassA (); -ClassB Try2 =NewClassB (); $ClassC Try3 =NewClassC (); $CLASSD Try4 =NewCLASSD (); -MyStruct Try5 =Newmystruct (); -             ObjectTry6 =Try5; theConsole.WriteLine ("analyzing ClassA type variable:"); - check. Check (try1);WuyiConsole.WriteLine ("analyzing ClassB type variable:"); the check. Check (Try2); -Console.WriteLine ("analyzing ClassC type variable:"); Wu check. Check (try3); -Console.WriteLine ("analyzing CLASSD type variable:"); About check. Check (TRY4); $Console.WriteLine ("analyzing mystruct type variable:"); - check. Check (try5); -Console.WriteLine ("analyzing boxed mystruct type variable:"); - check. Check (TRY6); A Console.readkey (); +         } the     } -}

The role of the c#is operator