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a runtime error will result because there is no implicit conversion defined from int (which is the runtime type of val in this case) to bool Therefore, even though this line will compile without error, it will result in a runtime error Before leaving this example, try a short experiment Change the type of str and val to object, and then try recompiling As you will see, compile-time errors result This is because object does not support the actions that are performed on the variables, and this is caught during compilation This is the primary difference between object and dynamic Even though both can be used to refer to any other type of object, only those actions supported by object can be used on a variable of type object By using dynamic, you can specify whatever action you like as long as that action is supported by the actual object being referred to at runtime To see how dynamic can simplify certain tasks, we will work through a simple example that uses it with reflection As explained in 17, one way to invoke a method on an object of a class that was obtained at runtime via reflection is to call the Invoke( ) method Although this works, it would be more convenient to invoke that method by name in cases in which the method name is known For example, you might have a situation in which you know that a certain assembly contains a specific class, which supports methods whose names and actions are known However, because this assembly is subject to change, you always want to make sure that you are using the latest version One way to accomplish this is to use reflection to examine the assembly, construct an object of the class, and then invoke the methods defined by the class By using dynamic, you can now invoke those methods by name (since the names are known) rather than through the Invoke( ) method To begin, put the following code in a file called MyClasscs This is the code that will be dynamically loaded via reflection.

public class DivBy { public bool IsDivBy(int a, int b) { if((a % b) == 0) return true; return false; }

Part I:

Both numerator and denominator tend to , so the quotient is indeterminate of the form / Thus l'H pital's Rule applies The limit equals lim

public bool IsEven(int a) { if((a % 2) == 0) return true; return false; } }

Next, compile this file into a DLL called MyClassdll If you are using the command-line compiler, then you can use this line:

Now, create the following program that uses MyClassdll, as shown here:

Now the only way that ln f ( x) can tend to zero is if f ( x) = x x tends to 1 We conclude that lim x x = 1

// Use dynamic with reflection using System; using SystemReflection; class DynRefDemo { static void Main() { Assembly asm = AssemblyLoadFrom("MyClassdll"); Type[] all = asmGetTypes(); // Find the DivBy class int i; for(i = 0; i < allLength; i++) if(all[i]Name == "DivBy") break; if(i == allLength) { ConsoleWriteLine("DivBy not found in assembly"); return; } Type t = all[i]; // Now, find the default constructor ConstructorInfo[] ci = tGetConstructors(); int j; for(j = 0; j < ciLength; j++) if(ci[j]GetParameters()Length == 0) break; if(j == ciLength) { ConsoleWriteLine( Default constructor not found ); return; } // Create a DivBy object dynamically dynamic obj = ci[j]Invoke(null); // Now, invoke methods on obj by name This is legal because // obj is of type dynamic, and the calls to the methods are

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20:

U n s a f e C o d e , P o i n t e r s , N u l l a b l e Ty p e s , D y n a m i c Ty p e s , a n d M i s c e l l a n e o u s To p i c s

// type-checked at runtime, not compile time if(objIsDivBy(15, 3)) ConsoleWriteLine("15 is evenly divisible by 3"); else ConsoleWriteLine("15 is NOT evenly divisible by 3"); if(objIsEven(9)) ConsoleWriteLine("9 is even"); else ConsoleWriteLine("9 is NOT even"); } }

Let f ( x) = ( 1 + x 2 ) ln |x| and consider ln f ( x) = ln |x| ln( 1 + x 2 ) This expression is indeterminate of the form 0