C# .Net 学习积累 《一》

base 关键字

见 msdn：http://msdn.microsoft.com/zh-cn/library/hfw7t1ce.aspx

 this 关键字

见 msdn：http://msdn.microsoft.com/zh-cn/library/dk1507sz.aspx

一. 将class封装成dll

在vs tools中点击vs command prompt，输入如下命令：

csc /target:library 文件名.cs

注意： 文件路径要正确。

二. 将主文件和dll关联

csc /reference:dll文件名.dll  主文件名.cs

会生成 主文件名.exe 文件， 执行 exe文件，就可以看到运行结果。

三. 值传递和引用传递，输出参数的调用实例

namespace Method21 { class Program { static void ValueMethod(int i) { i++; } static void ReferenceMethod(ref int i) { i++; } static void OutMethod(out int i) { i = 0; i++; } static void Main(string[] args) { int i = 0; int j = 0; int k; ValueMethod(i); ReferenceMethod(ref j); OutMethod(out k); Console.WriteLine("i={0}",i); Console.WriteLine("j={0}",j); Console.WriteLine("k={0}",k); Console.ReadKey(); } } }  

运行结果：

i=0

j=1

k=1

四. 可变参数函数
namespace Method21 { class Program { static int addi(params int[] values) { int sum = 0; foreach (int i in values) { sum = sum + i; } return sum; } static void Main(string[] args) { Console.WriteLine(addi(1, 2, 3, 4, 5, 6)); Console.ReadKey(); } } }

五. 类型转换

namespace convert21 { class Fruit { } class Apple:Fruit { public int i = 1; } class Program { static void Main(string[] args) { Fruit f = new Apple(); Console.WriteLine(((Apple)f).i); Console.ReadKey(); } } } 

六.  委托 

（1）委托，委托链（静态）

namespace delegate1 { class MyDelegate { delegate void EatDelegate(string sFood); static void zsEat(string sFood) { Console.WriteLine("张三吃 "+sFood); } static void lsEat(string sFood) { Console.WriteLine("李四吃 " + sFood); } static void wwEat(string sFood) { Console.WriteLine("王五吃 " + sFood); } static void Main(string[] args) { EatDelegate zs = new EatDelegate(zsEat); EatDelegate ls = new EatDelegate(lsEat); EatDelegate ww = new EatDelegate(wwEat); EatDelegate EatChain = zs + ls + ww; EatChain("西瓜"); Console.ReadKey(); } } } 

（2）. 匿名方法

namespace delegate11 { delegate void EatDelegate(string sFood); class MyDelegate { static void zsEat(string sFood) { Console.WriteLine("张三吃 "+sFood); } static void lsEat(string sFood) { Console.WriteLine("李四吃 " + sFood); } static void wwEat(string sFood) { Console.WriteLine("王五吃 " + sFood); } static void Main(string[] args) { EatDelegate Eatchain = null; Eatchain += delegate(string sFood) { Console.WriteLine("张三吃 " + sFood); }; Eatchain += delegate(string sFood) { Console.WriteLine("李四吃 " + sFood); }; Eatchain += delegate(string sFood) { Console.WriteLine("王五吃 " + sFood); }; Eatchain("西瓜"); Console.ReadKey(); } } } 

（3）委托，委托链（动态 类）

namespace delegate2 { delegate void EatDelegate(string sFood); class Man { private string _name; public Man(string name) { _name = name; } public void eat(string food) { Console.WriteLine(_name + "吃" + food); } } class Party { static void eatTogether(string food, params EatDelegate[] values) { if (values == null) { Console.WriteLine("聊天结束了..."); } else { EatDelegate EatChain = null; foreach (EatDelegate ed in values) { EatChain += ed; } EatChain(food); } Console.WriteLine(); } static void Main(string[] args) { Man zs = new Man("张三"); Man ls = new Man("李四"); Man ww = new Man("王五"); EatDelegate ZS = new EatDelegate(zs.eat); EatDelegate LS = new EatDelegate(ls.eat); EatDelegate WW = new EatDelegate(ww.eat); Console.WriteLine("张三，李四，王五 在聊天......"); eatTogether("Watermelon", ZS, LS, WW); Console.WriteLine("李四 出去接电话......"); eatTogether("Banana", ZS,WW); Console.WriteLine("李四 回来了......"); eatTogether("Orange", ZS, LS, WW); eatTogether(null,null); Console.ReadKey(); } } }

 （4） 实例

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace delegate01
{
    class DelegateSample
    {
        public delegate bool ComparisonHandler(int first, int second);
        public static void BubbleSort(int[] items, ComparisonHandler comparisonMethod)
        {
            int i, j, temp;
            for (i = items.Length - 1; i >= 0; i--)
            {
                for (j = 1; j <= i; j++)
                {
                    if (comparisonMethod(items[j - 1], items[j]))
                    {
                        temp = items[j - 1];
                        items[j - 1] = items[j];
                        items[j] = temp;
                    }
                }
            }
        }
        public static bool GreaterThan(int first, int second)
        {
            return first > second;
        }
        public static bool AlphabeticalGreaterThan(int first, int second)
        {
            int comparison;
            comparison = (first.ToString().CompareTo(second.ToString()));
            return comparison > 0;
        }
        static void Main(string[] args)
        {
            int i;
            int[] items = new int[5];
            for (i = 0; i < items.Length; i++)
            {
                Console.Write("Enter an integer: ");
                items[i] = int.Parse(Console.ReadLine());
            }
            BubbleSort(items, AlphabeticalGreaterThan);
            for (i = 0; i < items.Length; i++)
            {
                Console.WriteLine(items[i]);
            }
            Console.ReadKey();
        }
    }
}

7 索引器

http://www.cnblogs.com/jarod99/archive/2009/01/09/1372453.html

using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;

namespace basic01
{
    class IndexClass
    {
        private Hashtable name = new Hashtable();
        public string this[int index]
        {
            get { return name[index].ToString(); }
            set { name.Add(index, value); }
        }
        public int this[string aName]
        {
            get
            {
                foreach (DictionaryEntry d in name)
                {
                    if (d.Value.ToString() == aName)
                    {
                        return Convert.ToInt32(d.Key);
                    }
                }
                return -1;
            }
            set
            { name.Add(value, aName); }
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            IndexClass b = new IndexClass();
            b[500] = "Zhang San";
            b[300] = "Li Si";
            b[400] = "Wang Wu";
            Console.WriteLine("b[500] = " + b["Zhang San"]);
            Console.WriteLine("b[300] = " + b["Li Si"]);
            Console.WriteLine("b[400] = " + b["Wang Wu"]);

            b[600] = "Li Wu";
            b[700] = "Wang Liu";
            Console.WriteLine("b[600] = " + b[600]);
            Console.WriteLine("b[700] = " + b[700]);
            Console.ReadKey();
        }
    }
}