Visual C# 2005新功能
文／沈炳宏

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程式1
    class Class1
    {
        private String user;
        public String User
        {
            get { return user; }
            set { user = value; }
        }
        private int age;
        public int Age
        {
            get { return age; }
            set { age = value; }
        }
    }
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程式2
        public void test()
        {
            Class1 c = new Class1();
            c.User = "Bill";
            c.Age = 3;
            MessageBox.Show(
"User:" + c.User + ";Age:" + c.Age);
        }
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程式3
class ForEachTest
{
    static void Main(string[] args)
    {
        int[] fibarray = new int[] { 0, 1, 2, 3, 5, 8, 13 };
        foreach (int i in fibarray)
        {
            System.Console.WriteLine(i);
        }
    }
}
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程式4
    public class Stack<T> : IEnumerable<T>
    {
        private T[] values = new T[100];
        private int top = 0;
public void Push(T t) { values[top++] = t; }
        public T Pop() { return values[--top]; }
        public IEnumerator<T> GetEnumerator()
        {
            for (int i = top; --i >= 0; )
            {
                yield return values[i];
            }
        }
        IEnumerator IEnumerable.GetEnumerator()
        {
            return GetEnumerator();
        }
        public IEnumerable<T> TopToBottom
        {
            get
            {
                return this;
            }
        }
        public IEnumerable<T> BottomToTop
        {
            get
            {
                for (int i = 0; i < top; i++)
                {
                    yield return values[i];
                }
            }
        }

    class Test
    {
        static void Main()
        {
            Stack<int> s = new Stack<int>();
            for (int i = 0; i < 10; i++)
            {
                s.Push(i);
            }
            foreach (int n in s)
            {
                System.Console.Write("{0} ", n);
            }
            foreach (int n in s.TopToBottom)
            {
                System.Console.Write("{0} ", n);
            }
            foreach (int n in s.BottomToTop)
            {
                System.Console.Write("{0} ", n);
            }
        }
    }
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程式5
int? num = null;
        if (num.HasValue == true)
        {
            System.Console.WriteLine(
"num = " + num.Value);
        }
        else
        {
            System.Console.WriteLine(
"num = Null");
        }
        int y = num.GetValueOrDefault();
        try
        {
            y = num.Value;
        }
catch (System.InvalidOperationException e)
        {
     System.Console.WriteLine(e.Message);
        }
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程式6
void StartThread()
{
    System.Threading.Thread t1 = 
new System.Threading.Thread
      (delegate()
            {
          System.Console.Write("Hello, ");
          System.Console.WriteLine("RUN!PC");
            });
    t1.Start();
}
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程式7
public string Name
{
    get
    {
        return name;
    }
    protected set
    {
        name = value;
    }
}
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程式8
#pragma warning disable 414, 3021
[CLSCompliant(false)]
public class C
{
    int i = 1;
    static void Main()
    {
    }
}
#pragma warning restore 3021
[CLSCompliant(false)]  // CS3021
public class D
{
    int i = 1;
    public static void F()
    {
    }
}
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