C#高级教程

1. C# 特性（Attribute）

// 定义一个自定义特性
[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, Inherited = false, AllowMultiple = true)]
public class MyCustomAttribute : Attribute
{public string Name { get; set; }public MyCustomAttribute(string name){Name = name;}
}// 应用特性
[MyCustomAttribute("Hello")]
class Program
{static void Main(string[] args){// 反射获取特性信息var attributes = typeof(Program).GetCustomAttributes(false);foreach (var attribute in attributes){var customAttribute = (MyCustomAttribute)attribute;Console.WriteLine($"Attribute Name: {customAttribute.Name}");}}
}

2. C# 反射（Reflection）

using System;
using System.Reflection;class ReflectionExample
{public void Display(){Console.WriteLine("Reflection Example");}static void Main(string[] args){// 获取类型信息Type type = typeof(ReflectionExample);// 创建类型实例object obj = Activator.CreateInstance(type);// 获取方法信息MethodInfo methodInfo = type.GetMethod("Display");// 调用方法methodInfo.Invoke(obj, null);}
}

3. C# 属性（Property）

class PropertyExample
{// 私有字段private string _name;// 公共属性public string Name{get { return _name; }set { _name = value; }}static void Main(string[] args){var obj = new PropertyExample();// 使用属性obj.Name = "Kimi";Console.WriteLine(obj.Name);}
}

4. C# 索引器（Indexer）

class IndexerExample
{private int[] _array = new int[5];public int this[int index]{get { return _array[index]; }set { _array[index] = value; }}static void Main(string[] args){var obj = new IndexerExample();// 使用索引器obj[0] = 10;Console.WriteLine(obj[0]);}
}

5. C# 委托（Delegate）

using System;class DelegateExample
{// 定义委托public delegate void DisplayDelegate(string message);// 方法public void Display(string message){Console.WriteLine(message);}static void Main(string[] args){var obj = new DelegateExample();// 创建委托实例DelegateExample.DisplayDelegate del = obj.Display;// 委托调用方法del("Hello, Delegate!");}
}

6. C# 事件（Event）

using System;class EventExample
{// 定义事件public event EventHandler OnEventOccurred;// 引发事件的方法protected virtual void OnEvent(){OnEventOccurred?.Invoke(this, EventArgs.Empty);}static void Main(string[] args){var obj = new EventExample();// 订阅事件obj.OnEventOccurred += (sender, e) =>{Console.WriteLine("Event occurred!");};// 引发事件obj.OnEvent();}
}

7. C# 集合（Collection）

using System;
using System.Collections.Generic;class CollectionExample
{static void Main(string[] args){// 创建集合List<int> list = new List<int> { 1, 2, 3, 4, 5 };// 添加元素list.Add(6);// 遍历集合foreach (var item in list){Console.WriteLine(item);}}
}

8. C# 泛型（Generic）

using System;
using System.Collections.Generic;class GenericExample<T>
{private T _value;public T Value{get { return _value; }set { _value = value; }}static void Main(string[] args){var genericObj = new GenericExample<int>();// 设置值genericObj.Value = 10;// 获取值Console.WriteLine(genericObj.Value);}
}

9. C# 匿名方法

using System;class AnonymousMethodExample
{static void Main(string[] args){// 委托Action<string> action = delegate(string message) { Console.WriteLine(message); };// 调用委托action("Hello, Anonymous Method!");}
}

10. C# 不安全代码

using System;class UnsafeCodeExample
{static void Main(){// 不安全代码块unsafe{int number = 0;int* p = &number;// 修改指针指向的值*p = 1234;Console.WriteLine(number);}}
}

11. C# 多线程

using System;
using System.Threading;class ThreadExample
{static void ThreadMethod(){for (int i = 0; i < 10; i++){Console.WriteLine("Thread: " + i);Thread.Sleep(1000);}}static void Main(string[] args){// 创建线程Thread thread = new Thread(new ThreadStart(ThreadMethod));// 启动线程thread.Start();for (int i = 0; i < 5; i++){Console.WriteLine("Main Thread: " + i);Thread.Sleep(500);}thread.Join(); // 等待线程结束}
}