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To obtain the public, non-static constructors for a type, call GetConstructors( ) on a Type object One commonly used form is shown here: ConstructorInfo[ ] GetConstructors( ) It returns an array of ConstructorInfo objects that describe the constructors ConstructorInfo is derived from the abstract class MethodBase, which inherits MemberInfo It also defines several members of its own The method we are interested in is GetParameters( ), which returns a list of the parameters associated with a constructor It works just like GetParameters( ) defined by MethodInfo, described earlier Once an appropriate constructor has been found, an object is created by calling the Invoke( ) method defined by ConstructorInfo One form is shown here: object Invoke(object[ ] parameters) Any arguments that need to be passed to the method are specified in the array parameters If no arguments are needed, pass null to parameters In all cases, parameters must contain exactly the same number of elements as there are arguments and the types of arguments must be compatible with the types of the parameters Invoke( ) returns a reference to the object that was constructed The following program uses reflection to create an instance of MyClass:

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// Create an object using reflection using System; using SystemReflection; class MyClass { int x; int y; public MyClass(int i) { ConsoleWriteLine("Constructing MyClass(int, int) "); x = y = i; } public MyClass(int i, int j) { ConsoleWriteLine("Constructing MyClass(int, int) "); x = i; y = j; Show(); } 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) ");

Of course limx 3 9 = 9 Putting all this information into equation ( ) gives lim 4x 3 7x 2 + 5x 9 = 108 63 + 15 9 = 51

17:

x = a; 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 InvokeConsDemo { static void Main() { Type t = typeof(MyClass); int val; // Get constructor info ConstructorInfo[] ci = tGetConstructors(); ConsoleWriteLine("Available constructors: "); foreach(ConstructorInfo c in ci) { // Display return type and name ConsoleWrite(" " + tName + "("); // Display parameters ParameterInfo[] pi = cGetParameters(); for(int i=0; i < piLength; i++) { ConsoleWrite(pi[i]ParameterTypeName + " " + pi[i]Name); if(i+1 < piLength) ConsoleWrite(", "); } ConsoleWriteLine(")"); } ConsoleWriteLine(); // Find matching constructor int x; for(x=0; x < ciLength; x++) { ParameterInfo[] pi = ci[x]GetParameters(); if(piLength == 2) break; } if(x == ciLength) {

Thus we may apply the Pinching Theorem Obviously lim g( x) = lim h( x) = 0

Part I:

ConsoleWriteLine("No matching constructor found"); return; } else ConsoleWriteLine("Two-parameter constructor found\n"); // Construct the object object[] consargs = new object[2]; consargs[0] = 10; consargs[1] = 20; object reflectOb = ci[x]Invoke(consargs); ConsoleWriteLine("\nInvoking methods on reflectOb"); 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)) { // This is Set(int, 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)) { // This is Set(double, 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)) ConsoleWriteLine("14 is between x and y"); } else if(mNameEquals("Show")) { mInvoke(reflectOb, null); } } } }

17:

The output is shown here:

We conclude that limx 0 f ( x) = 0

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Available constructors: MyClass(Int32 i) MyClass(Int32 i, Int32 j) Two-parameter constructor found Constructing MyClass(int, int) Values are x: 10, y: 20 Invoking methods on reflectOb 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