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y = b; Show(); } // Overload set public void Set(double a, double b) { ConsoleWrite("Inside Set(double, double) "); x = (int) a; y = (int) b; Show(); } public void Show() { ConsoleWriteLine("Values are x: {0}, y: {1}", x, y); } } class InvokeMethDemo { static void Main() { Type t = typeof(MyClass); MyClass reflectOb = new MyClass(10, 20); int val; ConsoleWriteLine("Invoking methods in " + tName); ConsoleWriteLine(); MethodInfo[] mi = tGetMethods(); // Invoke each method foreach(MethodInfo m in mi) { // Get the parameters ParameterInfo[] pi = mGetParameters(); if(mNameEquals("Set", StringComparisonOrdinal) && pi[0]ParameterType == typeof(int)) { object[] args = new object[2]; args[0] = 9; args[1] = 18; mInvoke(reflectOb, args); } else if(mNameEquals("Set", StringComparisonOrdinal) && pi[0]ParameterType == typeof(double)) { object[] args = new object[2]; args[0] = 112; args[1] = 234; mInvoke(reflectOb, args); } else if(mNameEquals("Sum", StringComparisonOrdinal)) { val = (int) mInvoke(reflectOb, null); ConsoleWriteLine("sum is " + val); } else if(mNameEquals("IsBetween", StringComparisonOrdinal)) { object[] args = new object[1]; args[0] = 14; if((bool) mInvoke(reflectOb, args))

One point that you should learn from this example is that a function may be specified by different formulas on different parts of the domain

17:

ConsoleWriteLine("14 is between x and y"); } else if(mNameEquals("Show", StringComparisonOrdinal)) { mInvoke(reflectOb, null); } } } }

EXERCISE 3: How Formal Should Your Communication Be If you use the Formality Index to assess how your communication should be formatted and how it should sound, your readers will be more likely to respond as you intend Think about the project you worked on earlier writing a letter of reference to Mr Smith on behalf of your favorite boss Answer the three questions in the Formality Index to determine the appropriate level of formality: 1 Do you know your target reader(s) well and personally 2 Are they below you in rank 3 Is the subject of your communication good news What did you decide Most people evaluate this communication as one that s quite formal did you (Most people would score this between ten and twenty; for example, 1 + 2 + 9 = 12) Once you complete the Formality Index, you re ready to move on to the nal tool of this chapter This third tool, the Matrix of Persuasion, helps you classify your overall writing assignment Doing so enables you to understand, strategically, how best to present bene ts to your target readers

The output is shown here:

Invoking methods in MyClass sum is 30 14 is between x and y Inside Set(int, int) Values are x: 9, y: 18 Inside Set(double, double) Values are x: 1, y: 23 Values are x: 1, y: 23

Also lim 7x 2 = 7 [ lim x] [ lim x] = 7 3 3 = 63 ,

Look closely at how the methods are invoked First, a list of methods is obtained Then, inside the foreach loop, parameter information is retrieved Next, using a series of if/else statements, each method is executed with the proper type and number of arguments Pay special attention to the way that the overloaded Set( ) method is executed by the following code:

if(mNameEquals("Set", StringComparisonOrdinal) && pi[0]ParameterType == typeof(int)) { object[] args = new object[2]; args[0] = 9; args[1] = 18; mInvoke(reflectOb, args); } else if(mNameEquals("Set", StringComparisonOrdinal) && pi[0]ParameterType == typeof(double)) { object[] args = new object[2]; args[0] = 112; args[1] = 234; mInvoke(reflectOb, args); }

If the name of the method is Set, then the type of the first parameter is tested to determine which version of the method was found If it was Set(int, int), then int arguments are loaded into args Otherwise, double arguments are used

lim 5x = 5 [ lim x] = 5 3 = 15

In the previous example, there is no advantage to using reflection to invoke methods on MyClass since an object of type MyClass was explicitly created It would be easier to just call its methods normally However, the power of reflection starts to become apparent when an object is created dynamically at runtime To do this, you will need to first obtain a list of the constructors Then, you will create an instance of the type by invoking one of the constructors This mechanism allows you to instantiate an object at runtime without naming it in a declaration statement

Part I: