This print for content only-size & color not accurate 7" X 9-1/4" / casebound / malloy

// Get metadata for the Minivan type.

Type miniVan = a.GetType("CarLibrary.MiniVan");

// Create the Minivan on the fly.

object obj = Activator.CreateInstance(miniVan);

Console.WriteLine("Created a {0} using late binding!", obj);

// Get info for TurboBoost.

MethodInfo mi = miniVan.GetMethod("TurboBoost");

// Invoke method ('null' for no parameters).

mi.Invoke(obj, null);

Console.ReadLine();

}

At this point you are happy to see the message box in Figure 16-5.

Figure 16-5.

Late-bound method invocation

Invoking Methods with Parameters

To illustrate how to dynamically invoke a method that does take some number of parameters,

assume you have updated the MiniVan type created in the previous chapter with a new method

named TellChildToBeQuiet():

// Quiet down the troops...

public void TellChildToBeQuiet(string kidName, int shameIntensity)

{

for(int i = 0 ; i < shameIntensity; i++)

MessageBox.Show(string.Format("Be quiet {0} !!", kidName));

}

TellChildToBeQuiet() takes two parameters: a string representing the child’s name and an

integer representing your current level of frustration. When using late binding, parameters are

packaged as an array of System.Objects. To invoke the new method, update the Main() method as

follows:

C H A P T E R   1 6  

■

T Y P E   R E F L E C T I O N, L AT E   B I N D I N G, A N D  AT T R I B U T E - B A S E D   P R O G R A M M I N G

541

8849CH16.qxd  10/9/07  4:27 PM  Page 541

---

static void Main(string[] args)

{

...

// Get metadata for the Minivan type.

Type miniVan = a.GetType("CarLibrary.MiniVan");

// Create the Minivan on the fly.

object obj = Activator.CreateInstance(miniVan);

Console.WriteLine("Created a {0} using late binding!", obj);