C# 0 The Complete Reference

PART I

C h a p t e r   1 7 :  

R u n t i m e   T y 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  

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PART IPART I

The output is shown here:

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

Let’s look at how reflection is used to construct a 

MyClass

 object. First, a list of the 

public constructors is obtained using the following statement:

ConstructorInfo[] ci = t.GetConstructors();

Next, for the sake of illustration, the constructors are displayed. Then the list is searched 

for a constructor that takes two arguments, using this code:

for(x=0; x < ci.Length; x++) {

  ParameterInfo[] pi =  ci[x].GetParameters();

  if(pi.Length == 2) break;

}

If the constructor is found (as it will be in this case), an object is instantiated by the 

following sequence:

// Construct the object.

object[] consargs = new object[2];

consargs[0] = 10;

consargs[1] = 20;

object reflectOb = ci[x].Invoke(consargs);

After the call to