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Type t = typeof(MyClass); // get a Type object representing MyClass
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Recall that typeof returns a Type object that represents the specified type, which in this case is MyClass Using t and the Reflection API, the program then displays information about the methods supported by MyClass First, a list of the methods is obtained by the following statement:
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MethodInfo[] mi = tGetMethods();
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Next, a foreach loop is established that cycles through mi With each pass, the return type, name, and parameters for each method are displayed by the following code:
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// Display return type and name ConsoleWrite(" " + mReturnTypeName + " " + mName + "(");
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Part I:
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// Display parameters ParameterInfo[] pi = mGetParameters(); for(int i=0; i < piLength; i++) { ConsoleWrite(pi[i]ParameterTypeName + " " + pi[i]Name); if(i+1 < piLength) ConsoleWrite(", "); }
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In this sequence, the parameters associated with each method are obtained by calling GetParameters( ) and stored in the pi array Then a for loop cycles through the pi array, displaying the type and name of each parameter The key point is that this information is obtained dynamically at runtime without relying on prior knowledge of MyClass
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A Second Form of GetMethods( )
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A second form of GetMethods( ) lets you specify various flags that filter the methods that are retrieved It has this general form: MethodInfo[ ] GetMethods(BindingFlags bindingAttr) This version obtains only those methods that match the criteria you specify BindingFlags is an enumeration Here are several commonly used values:
Value DeclaredOnly Instance NonPublic Public Static Meaning Retrieves only those methods defined by the specified class Inherited methods are not included Retrieves instance methods Retrieves nonpublic methods Retrieves public methods Retrieves static methods
You can OR together two or more flags In fact, minimally you must include either Instance or Static with Public or NonPublic Failure to do so will result in no methods being retrieved One of the main uses of the BindingFlags form of GetMethods( ) is to enable you to obtain a list of the methods defined by a class without also retrieving the inherited methods This is especially useful for preventing the methods defined by object from being obtained For example, try substituting this call to GetMethods( ) into the preceding program:
// Now, only methods declared by MyClass are obtained MethodInfo[] mi = tGetMethods(BindingFlagsDeclaredOnly | BindingFlagsInstance | BindingFlagsPublic) ;
After making this change, the program produces the following output:
Analyzing methods in MyClass Methods supported: Int32 Sum()
17:
R u n t i m e Ty p e I D , R e f l e c t i o n , a n d A t t r i b u t e s
Boolean IsBetween(Int32 i) Void Set(Int32 a, Int32 b)
PART I
Void Set(Double a, Double b) Void Show()
As you can see, only those methods explicitly defined by MyClass are displayed
Calling Methods Using Reflection
Once you know what methods a type supports, you can call one or more of them To do this, you will use the Invoke( ) method that is contained in MethodInfo One of its forms is shown here: object Invoke(object obj, object[ ] parameters) Here, obj is a reference to the object on which the method is invoked (For static methods, you can pass null to obj) Any arguments that need to be passed to the method are specified in the array parameters If no arguments are needed, parameters must be null Also, parameters must contain exactly the same number of elements as there are arguments Therefore, if two arguments are needed, then parameters must be two elements long It can t, for example, be three or four elements long The value returned by the invoked method is returned by Invoke( ) To call a method, simply call Invoke( ) on an instance of MethodInfo that was obtained by calling GetMethods( ) The following program demonstrates the procedure:
// Invoke methods using reflection using System; using SystemReflection; class MyClass { int x; int y; public MyClass(int i, int j) { x = i; y = j; } public int Sum() { return x+y; } public bool IsBetween(int i) { if((x < i) && (i < y)) return true; else return false; } public void Set(int a, int b) { ConsoleWrite("Inside Set(int, int) "); x = a;
Part I:
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