【C#學(xué)習筆記】一、基礎(chǔ)知識

1.1數(shù)據(jù)類型（P43）

1.2枚舉類型（P97）

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

//【例子1】枚舉的基本應(yīng)用

//1)賦值是可以使用其枚舉值賦值，如ct=emCardType.Temic;也可以直接用數(shù)值賦值，如ct = (emCardType)3;也可用將字符串經(jīng)過轉(zhuǎn)換// 賦值給枚舉變量,如ct = (emCardType)Enum.Parse(typeof(emCardType), "M1")

//2)使用WritenLine時其實是調(diào)用其ToString()方法將其轉(zhuǎn)換為字符串

//3)可以將沒有枚舉到的數(shù)值賦給枚舉變量，但ToString()方法顯示的字符串為其值

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

enum emCardType:byte

{

Temic,

Em=2,

ID,

M1

}

emCardType ct;

ct=emCardType.Temic ;

Console.WriteLine("ct is {0},value is {1}", ct,(byte)ct); //顯示"ct is Temic,value is 0"

ct++;

Console.WriteLine("ct is {0},value is {1}", ct,(byte)ct); //顯示"ct is 1,value is 1"

ct = (emCardType)Enum.Parse(typeof(emCardType), "M1");

Console.WriteLine("ct is {0},value is {1}", ct, (byte)ct); //顯示"ct is M1,value is 4"

ct = (emCardType)3;

Console.WriteLine("ct is {0},value is {1}", ct.ToString(), (byte)ct); //顯示"ct is ID,value is 3"

Console.ReadKey();

1.3數(shù)組

1）一維數(shù)組定義

int[] myIntArray = { 5, 9, 10, 2, 99 };

int[] myIntArray = new int[5];

int[] myIntArray = new int[5] { 5, 9, 10, 2, 99 };

2）多維數(shù)組定義

double[,] hillHeight = new double[3, 4];

double[,] hillHeight = { { 1, 2, 3, 4 }, { 2, 3, 4, 5 }, { 3, 4, 5, 6 } };

3）數(shù)組的數(shù)組

int [][] myarray

myarray=new int[2][];

myarray[0]=new int[3];

myarray[1]=new int[4];

myarray=new int[3][](new int[]{1,2,3},new int[]{1},new int[]{1,2});

foreach (int[] subarray in myarray)

{

foreach(int nValue in subarray)

Console.WriteLine(nValue);

}

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

//【例子1】數(shù)組復(fù)制

//若直接使用=號則兩個數(shù)組引用相同的值,要使用CopyTo方法進行復(fù)制

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

int[] myInt = new int[5]{5,2,1,8,4};

foreach (int i in myInt)

Console.Write(i + ",");

Console.WriteLine("");

int[] myInt2=new int[5];

myInt.CopyTo(myInt2,0);

//myInt2 = myInt;

myInt[1] = 3;

foreach (int i in myInt2)

Console.Write(i + ",");

1.4委托（P137）

【例子1】

class PRogram

{

delegate double ProcessDelegate(double param1,double param2);

static double Multiply(double param1,double param2)

{

return param1*param2;

}

static double Divide(double param1,double param2)

{

return param1/param2;

}

static void Main(string[] args)

{

ProcessDelegate process;

if (input=="M") //根據(jù)輸入的不同將其實例化為不同的函數(shù)

process=new processDelegate(Multiply);

else

process=new processDelegate(Divide);

double fRet=process(f1,f2);

}

}

【例子2】

private delegate int mif_selecom(int nCom, int nBaud);

private void button1_Click(object sender, EventArgs e)

{

IntPtr pDll = LoadLibrary("LC32RFRW.dll");

IntPtr pAddressOfFunctionToCall = GetProcAddress(pDll, "mif_selecom");

mif_selecom DoSeleCom = (mif_selecom)Marshal.GetDelegateForFunctionPointer(pAddressOfFunctionToCall,

typeof(mif_selecom));

}