最近学习了C#程序设计的课程， 现在将笔记总结如下， 没有系统整理，都是课上记得notes, 后面几部分以程序居多,因为这些笔记没有做过整理，所以很多code没有详细的注释，如果有时间的话，我会对笔记做系统的整理，还有这里没有提及基本的语法介绍，望大家谅解:

Basic:
//利用out, 不用给i,j assign初始值
int i,j;
f(out i, out j) {}
//using, 括号外自动destroy对象
using (Font theFont == new Font("Ariel", 10.0f)){}
//constants
const int i = 32;
//Enumeration
enum E {a=5,b=8}
int i = (int) E.a;
//turn buff data to string
Encoding.ASCII.GetString(buff, 0, bytesRead)
// read data
string s = Console.ReadLine()
int j= Convert.ToInt32(s);
//get textbox value and convert to double
double left = double.Parse(textBox1.Text);
Application.DoEvent(); //this will let app deal with event
array:
A[] a = new A[5]; // a[0]to a[5] is null
int[] arr = new int[2] {1,2}
int[] arr = {2,3,4,5}
foreach(A a in arr_A) {}
for(int i=0; i<arr.Length; i++) {}
//Rectangular Arrays
int[,] rectArray = new int[4,5]
int[,] arr = {{1,2,3,4},{1,2,3,4}{1,2,3,4}}; //init
//Jagged array, 数组中包含数组，各维不等长
// ja[0].Length is length of ja[0]
int [][] ja = new int[4][];
//using params transfer a array to a function
//using f(1,2,3,4) to call the function
f(params int[] values){
foreach (int[] a in values) {}
}
Collection interface:
indexers:
//define a indexers
public Myclass this[int offset] {get{};set{}}
//call it
Employee joe = bostonOffice["Joe"];
IEnumerable:
//return a IEnumerator object
GetEnumerator()
IEnumerator:
Reset(){}
Current(){}
MoveNext(){}
IComparable:
//Class inherit IComparable interface
//Implement CompareTo() method
CompareTo()
ArrayLists:
Count Get number of elements
Add() Add an object
Clear() Remove all objects
Reverse() Reverse order of elements
Sort() Sort the elements
function:
//default by value
f(int x){}
//by reference
f(ref int x){}
class:
//存取：
public, private, protected, internal, protected internal
this, static //static member must be init in class
//继承
class A: B {}
//多态
virtual，override
//init对象
Employee emp1 = new Employee();

//先隐式转换3为Roman
Roman r4 = r1 + 3;
//先显式转换7.5为Roman
Roman r5 = r1 +(Roman)7.5;

// 运算符重载,先返回int, 然后用隐式转换
public static Roman operator+ (Roman l, Roman r)
{
return (l.val+r.val);
}
//显式转换
public static explicit operator Roman(float val)
{
return new Roman(val);
}
//隐式转换
public static implicit operator Roman(int val)
{
return new Roman(val);
}
//properties, 注意大小写
public int Age {
get {return age;}
set {age = value;}
}

//Interface
//interface methods must be implement in class
public interface IA {}
//is 测试类是否从接口继承
if (a is IA) {IA c = (IA) a; }
//as 测试类是否从接口继承
IA c = a as IA;
if (c != null) {}
//interface properties
pubiic interface IAA: IA
{
float F{get;set;}
}
//mutiface interface inheritance
public class C: IA,