C#2.0新特性（早期学习笔记）

1、泛型

namespace GenericsDemo

{

    class TestGenerics

    {      

            static void Main(string[] args)

{

GenericsExample();

}   

private void GenericsExample()

{

ClsGeneric<int> intGeneric = new ClsGeneric<int>(1000);

ClsGeneric<string> strGeneric = new ClsGeneric<string>("Voila");

ClsGeneric<float> fGeneric = new ClsGeneric<float>(23.38f);

ClsGeneric<double> dGeneric = new ClsGeneric<double>(444.4);

ClsGeneric<bool> bGeneric = new ClsGeneric<bool>(true);

           }

}

 

    public class ClsGeneric<T>

    {

       public ClsGeneric(T Type)

       {

           Console.WriteLine("T over here is {0} ", typeof(T).ToString());

       }

    }

}

2、迭代器

public class StringCollection : System.Collections.IEnumerable

{

string[] names = { "Tom", "Dick", "Harry”, "Ralph", "Jack", "Jill” };

public System.Collections.IEnumerator GetEnumerator()

{

        for (int i = 0; i < names.Length; i++)

        {

              yield return names[i];

              // In C#1.x you would have specified it using

              // return names[i].GetEnumerator();

        }

}

}

class TestStringCollection

{

    static void Main()

    {

       // Create an instance

       StringCollection strNames = new StringCollection();

 

       foreach (string name in strNames)

       {

              System.Console.WriteLine(name);

       }

      Console.WriteLine("Press any key to continue...");

      Console.ReadKey();

    }

}

3、局部类

public partial class A

{

    public void methodA()

    {

              // Code for methodA

    }

}

public partial class A

{

    public void methodB()

    {

              // Code for methodB

    }

}

4、空类型

int? iVal = null;

if (iVal.HasValue == true)

{

      System.Console.WriteLine("iVal = " + iVal.Value);

}

else

{

      System.Console.WriteLine("iVal = Null");

}

5、匿名方法

public class frmNew : Form

{

 public frmNew()

 {

InitializeComponent();

btnNew.Click += delegate(object sender, EventArgs e)

{

MessageBox.Show(“New way of handling button click using anonymous methods");

};

 }

}

// Declare a delegate

delegate void PrintHello(string str);

class TestAnonymous

{

static void Main()

{

PrintHello hello = new PrintHello(TestAnonymous.TestMethod);

              hello(“Hello! Test!”);

}

}

static void TestMethod(string test)

{

   System.Console.WriteLine(test);

}

6、属性的访问修饰符

public string StrMyName

{

    get

    {

        return strMyName;

    }

    protected set

    {

        strMyName = value;

    }

}