MathTest
using System; namespace Wrox { class MainEntryPoint { static void Main() { // Try calling some static functions Console.WriteLine("Pi is " + MathTest.GetPi()); int x = MathTest.GetSquareOf(5); Console.WriteLine("Square of 5 is " + x); // Instantiate at MathTest object MathTest math = new MathTest(); // this is C#‘s way of // instantiating a reference type // Call non-static methods math.Value = 30; Console.WriteLine( "Value field of math variable contains " + math.Value); Console.WriteLine("Square of 30 is " + math.GetSquare()); } } // Define a class named MathTest on which we will call a method class MathTest { public int Value; public int GetSquare() { return Value*Value; } public static int GetSquareOf(int x) { return x*x; } public static double GetPi() { return 3.14159; } } }
MathTestWeakReference
using System; namespace Wrox { class MainEntryPoint { static void Main() { // Instantiate a weak reference to MathTest object WeakReference mathReference = new WeakReference(new MathTest()); MathTest math; if(mathReference.IsAlive) { math = mathReference.Target as MathTest; math.Value = 30; Console.WriteLine( "Value field of math variable contains " + math.Value); Console.WriteLine("Square of 30 is " + math.GetSquare()); } else { Console.WriteLine("Reference is not available."); } GC.Collect(); if(mathReference.IsAlive) { math = mathReference.Target as MathTest; } else { Console.WriteLine("Reference is not available."); } } } // Define a class named MathTest on which we will call a method class MathTest { public int Value; public int GetSquare() { return Value*Value; } public static int GetSquareOf(int x) { return x*x; } public static double GetPi() { return 3.14159; } } }
ParameterTest
using System; namespace Wrox { class ParameterTest { static void SomeFunction(int[] ints, int i) { ints[0] = 100; i = 100; } public static int Main() { int i = 0; int[] ints = { 0, 1, 2, 4, 8 }; // Display the original values Console.WriteLine("i = " + i); Console.WriteLine("ints[0] = " + ints[0]); Console.WriteLine("Calling SomeFunction..."); // After this method returns, ints will be changed, // but i will not SomeFunction(ints, i); Console.WriteLine("i = " + i); Console.WriteLine("ints[0] = " + ints[0]); return 0; } } }
时间: 2024-10-12 17:22:51