适合每位开发人员的 60 个 C# 代码片段("60个C#代码片段：每位开发人员的实用宝典")

一、基础语法

以下是一些基础的C#代码片段，涵盖了变量声明、数据类型转换、条件判断等。

1. 变量声明

int number = 10;
string text = "Hello, World!";
float pi = 3.14f;
double area = 12.5;
bool isTrue = true;
    

2. 数据类型转换

int intValue = 10;
double doubleValue = (double)intValue;
string stringValue = intValue.ToString();
    

3. 条件判断

int age = 18;
if (age >= 18)
{
    Console.WriteLine("You are an adult.");
}
else
{
    Console.WriteLine("You are not an adult.");
}
    

二、面向对象编程

以下是一些涉及面向对象编程的代码片段，包括类的定义、继承、多态等。

1. 类的定义与使用

public class Person
{
    public string Name { get; set; }
    public int Age { get; set; }
    public Person(string name, int age)
    {
        Name = name;
        Age = age;
    }
    public void Introduction()
    {
        Console.WriteLine($"My name is {Name} and I am {Age} years old.");
    }
}
Person person = new Person("John", 25);
person.Introduction();
    

2. 继承

public class Student : Person
{
    public string StudentID { get; set; }
    public Student(string name, int age, string studentID) : base(name, age)
    {
        StudentID = studentID;
    }
    public void ShowStudentID()
    {
        Console.WriteLine($"Student ID: {StudentID}");
    }
}
Student student = new Student("Alice", 20, "S12345");
student.Introduction();
student.ShowStudentID();
    

3. 多态

public interface IShape
{
    void Draw();
}
public class Circle : IShape
{
    public void Draw()
    {
        Console.WriteLine("Drawing a circle.");
    }
}
public class Rectangle : IShape
{
    public void Draw()
    {
        Console.WriteLine("Drawing a rectangle.");
    }
}
IShape shape1 = new Circle();
IShape shape2 = new Rectangle();
shape1.Draw();
shape2.Draw();
    

三、数据结构

以下是一些涉及数据结构的代码片段，包括数组、列表、字典等。

1. 数组

int[] numbers = { 1, 2, 3, 4, 5 };
for (int i = 0; i < numbers.Length; i++)
{
    Console.WriteLine(numbers[i]);
}
    

2. 列表

List numbersList = new List { 1, 2, 3, 4, 5 };
foreach (int number in numbersList)
{
    Console.WriteLine(number);
}
    

3. 字典

Dictionary dictionary = new Dictionary();
dictionary.Add(1, "One");
dictionary.Add(2, "Two");
dictionary.Add(3, "Three");
foreach (KeyValuePair pair in dictionary)
{
    Console.WriteLine($"{pair.Key}: {pair.Value}");
}
    

四、文件操作

以下是一些涉及文件操作的代码片段，包括文件的读取、写入、复制等。

1. 文件读取

string filePath = "example.txt";
string content = File.ReadAllText(filePath);
Console.WriteLine(content);
    

2. 文件写入

string filePath = "example.txt";
string content = "Hello, World!";
File.WriteAllText(filePath, content);
    

3. 文件复制

string sourceFilePath = "example.txt";
string destinationFilePath = "copy_example.txt";
File.Copy(sourceFilePath, destinationFilePath);
    

五、LINQ查询

以下是一些涉及LINQ查询的代码片段，包括基本查询、排序、聚合等。

1. 基本查询

List numbers = new List { 1, 2, 3, 4, 5 };
var evenNumbers = numbers.Where(n => n % 2 == 0);
foreach (int number in evenNumbers)
{
    Console.WriteLine(number);
}
    

2. 排序

List numbers = new List { 5, 2, 1, 4, 3 };
var sortedNumbers = numbers.OrderBy(n => n);
foreach (int number in sortedNumbers)
{
    Console.WriteLine(number);
}
    

3. 聚合

List numbers = new List { 1, 2, 3, 4, 5 };
int sum = numbers.Sum();
Console.WriteLine($"Sum: {sum}");
    

六、网络编程

以下是一些涉及网络编程的代码片段，包括HTTP请求、TCP连接等。

1. HTTP请求

string url = "https://www.example.com";
using (var client = new WebClient())
{
    string content = client.DownloadString(url);
    Console.WriteLine(content);
}
    

2. TCP连接

string ipAddress = "127.0.0.1";
int port = 12345;
using (var tcpClient = new TcpClient(ipAddress, port))
{
    using (var stream = tcpClient.GetStream())
    {
        byte[] buffer = new byte[1024];
        int bytesRead = stream.Read(buffer, 0, buffer.Length);
        string message = Encoding.ASCII.GetString(buffer, 0, bytesRead);
        Console.WriteLine(message);
    }
}
    

七、其他实用代码片段

以下是一些其他实用的C#代码片段，涵盖了日期时间处理、正则表达式、异步编程等。

1. 日期时间处理

DateTime currentDate = DateTime.Now;
Console.WriteLine($"Current Date and Time: {currentDate}");
DateTime futureDate = currentDate.AddDays(10);
Console.WriteLine($"Future Date: {futureDate}");
    

2. 正则表达式

string input = "123-456-7890";
var match = Regex.Match(input, @"(\d{3})-(\d{3})-(\d{4})");
if (match.Success)
{
    Console.WriteLine($"Area Code: {match.Groups[1]}");
    Console.WriteLine($"Exchange Code: {match.Groups[2]}");
    Console.WriteLine($"Subscriber Number: {match.Groups[3]}");
}
    

3. 异步编程

async Task LongRunningOperationAsync()
{
    Console.WriteLine("Operation started.");
    await Task.Delay(1000);
    Console.WriteLine("Operation completed.");
}
await LongRunningOperationAsync();
    

以上是60个C#代码片段的简要介绍，涵盖了C#编程的各个方面。这些代码片段旨在帮助开发人员迅速解决常见问题，尽大概减少损耗开发高效。愿望这些代码片段对您有所帮助！

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