协议 25

数组

声明数组

int\[\] intarr

float\[\] farr01

初始化数组

int intarr=new int $5$ ;

float farr=new float $6$

ushort\[\] usarr=new ushort $5$ //声明加初始化

赋值

intarr $2$ =14;

float\[\] farr={1.2f,2.3f,1.2f,4.1f,1.4f,3.2f,1.2f};

float\[\] fArr= new float $3$ {2.3f,66.9f,99.9f};

ushort\[\] usArr2=new ushort\[\]{23,567,999,10003};

string strArr = "Lee,Json,SQLServer,GitHub,School";

string\[\] items = strArr.Split(','); //这里用到了字符串的分割方

int val = arr1 $5$ ; //访问第6个元素

二维数组

int $,$ arr01=new int $3,4$ ;

// 声明一个二维数组

初始化

int $,$ arr = new int $3,2$ {

{10,22},

{45,33},

{99,20}

};

访问

int item=arr $1,2$ ; //表示取arr数组中第二行第3个元素的值。

数据类型

值类型（Value types）

引用类型（References types）

指针类型（Pointer types）引用类型

array类

是 C# 中所有数组的基类，其中提供了一系列用来处理数组的操作

属性

length

方法

GetLength获取数组指定维度中的元素数，并返回一个 32 位整数

ToString()返回一个表示当前对象的字符串（继承自 Object）

csharp 复制代码

int[] intArr03=new int[2];
 Array.Copy(intArr01, intArr03, 2);//复制指定数目的元素到目标数组

字符串

声明初始化

//声明字符串变量，赋字符串值

string sName = "育";

//调用返回字符串的方法

string strIds=method.GetIdsString(ids);

属性

Length

获取当前 String 对象中的字符数（字符串的长度）

方法

Contains(String)判断一个字符串中是否包含另一个字符串

IndexOf(String)返回字符在字符串中的首次出现的索引位置，索引从零开始

IsNullOrEmpty(String)判断指定的字符串是否为空（null）或空字符串（""）

Substring(Int32)从指定的位置截取字符串

Remove(Int32)返回一个指定长度的新字符串，将字符串中超出长度以外的部分全部删除

Trim()删除字符串首尾的空白字符

str2.Contains(str1)

string.Compare(str1, str2)

string str9 = str8.Trim();//删除字符串中的首尾空格

修饰符

有三大特性------封装、继承、多态。

public Protected internal protected private

csharp 复制代码

using System.IO.Ports;
using System.Text;

namespace CommComponent
{
    internal class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello, World!");
            string[] ports=SerialPort.GetPortNames();

            SerialPort serialPort = new SerialPort();
            //serialPort.PortName = "COM2";
            //serialPort.BaudRate = 9600;
            //serialPort.DataBits = 8;
            //serialPort.Parity = Parity.None;
            //serialPort.StopBits= StopBits.None;

            serialPort = new SerialPort("COM3",9600,Parity.None,8,StopBits.One);
            serialPort.Open();
            serialPort.DataReceived += SerialPort_DataReceived;
            // serialPort.WriteLine("hello你好");
            //byte[] datas = new byte[] { 0x01, 0x02, 0x03 };
           // Encoding.ASCII.GetString(datas);
          //  serialPort.Write(datas,0,datas.Length);
            //serialPort.WriteBufferSize = 65535;
            Thread.Sleep(20);
            byte[] buffer = new byte[serialPort.BytesToRead];
            int count=serialPort.Read(buffer, 0, serialPort.BytesToRead);
            Console.ReadLine();
            serialPort.Close();

        }

        private static void SerialPort_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            //throw new NotImplementedException();
            SerialPort serialPort = (sender as SerialPort);
            byte[] buffer = new byte[serialPort.BytesToRead];
            int count=(sender as SerialPort).Read(buffer, 0, serialPort.BytesToRead);
            Console.WriteLine(string.Join("",new List<byte>(buffer).Select(x=>x.ToString("x2"))));

        }
    }
}

csharp 复制代码

private static void SerialPort_DataReceived(object sender, SerialDataReceivedEventArgs e) {
    SerialPort serialPort = (sender as SerialPort);
    byte[] buffer = new byte[serialPort.BytesToRead]; // 创建一个刚好能装下待读数据的数组
    int count = (sender as SerialPort).Read(buffer, 0, serialPort.BytesToRead); // 读取数据到数组
    Console.WriteLine(string.Join("", new List<byte>(buffer).Select(x => x.ToString("x2"))); // 将每个字节转为十六进制格式并打印
}

csharp 复制代码

using System.IO.Ports;
using System.Text;

namespace CommComponent
{
    internal class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello, World!");
            string[] ports=SerialPort.GetPortNames();

            SerialPort serialPort = new SerialPort();
            //serialPort.PortName = "COM2";
            //serialPort.BaudRate = 9600;
            //serialPort.DataBits = 8;
            //serialPort.Parity = Parity.None;
            //serialPort.StopBits= StopBits.None;

            serialPort = new SerialPort("COM3",9600,Parity.None,8,StopBits.One);
            serialPort.Open();
            serialPort.DataReceived += SerialPort_DataReceived;
            // serialPort.WriteLine("hello你好");
            //byte[] datas = new byte[] { 0x01, 0x02, 0x03 };
           // Encoding.ASCII.GetString(datas);
          //  serialPort.Write(datas,0,datas.Length);
            //serialPort.WriteBufferSize = 65535;
            Thread.Sleep(20);
            byte[] buffer = new byte[serialPort.BytesToRead];
            int count=serialPort.Read(buffer, 0, serialPort.BytesToRead);
            Console.ReadLine();
            serialPort.Close();

        }

        private static void SerialPort_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            //throw new NotImplementedException();
            SerialPort serialPort = (sender as SerialPort);
            byte[] buffer = new byte[serialPort.BytesToRead];
            int count=(sender as SerialPort).Read(buffer, 0, serialPort.BytesToRead);
            Console.WriteLine(string.Join("",new List<byte>(buffer).Select(x=>x.ToString("x2"))));

        }
    }
}

csharp 复制代码

using System.IO.Ports;
using System.Text;

namespace CommComponent
{
    internal class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello, World!");
            string[] ports=SerialPort.GetPortNames();

            SerialPort serialPort = new SerialPort();
            //serialPort.PortName = "COM2";
            //serialPort.BaudRate = 9600;
            //serialPort.DataBits = 8;
            //serialPort.Parity = Parity.None;
            //serialPort.StopBits= StopBits.None;

            serialPort = new SerialPort("COM3",9600,Parity.None,8,StopBits.One);
            serialPort.Open();
          //  serialPort.DataReceived += SerialPort_DataReceived;
            // serialPort.WriteLine("hello你好");
            //byte[] datas = new byte[] { 0x01, 0x02, 0x03 };
           // Encoding.ASCII.GetString(datas);
          //  serialPort.Write(datas,0,datas.Length);
            //serialPort.WriteBufferSize = 65535;
            Thread.Sleep(20);
            while (serialPort.BytesToRead == 0)
            {

            }


            byte[] buffer = new byte[serialPort.BytesToRead];
            int count=serialPort.Read(buffer, 0, serialPort.BytesToRead);
            Console.WriteLine(string.Join("", new List<byte>(buffer).Select(x => x.ToString("x2"))));
            Console.ReadLine();
            serialPort.Close();

        }

        private static void SerialPort_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            //throw new NotImplementedException();
            SerialPort serialPort = (sender as SerialPort);
            byte[] buffer = new byte[serialPort.BytesToRead];
            int count=(sender as SerialPort).Read(buffer, 0, serialPort.BytesToRead);
            Console.WriteLine(string.Join("",new List<byte>(buffer).Select(x=>x.ToString("x2"))));

        }
    }
}

数组

声明数组

初始化数组

ushort\[\] usarr=new ushort5 //声明加初始化

赋值

二维数组

int, arr01=new int3,4;

初始化

访问

数据类型

array类

属性

方法

字符串

声明 初始化

属性

方法

修饰符

ushort\[\] usarr=new ushort $5$ //声明加初始化

int $,$ arr01=new int $3,4$ ;

声明初始化