掌握C#语言的精髓：基础知识与实用技能详解（数据类型与变量+ 条件与循环+函数与模块+LINQ+异常+OOP）

// 整数
int numInt = 10;
// 浮点数
float numFloat = 3.14f;
// 字符串
string strVar = "Hello, World!";

// 条件语句
int x = 10;
if (x > 5) {
    Console.WriteLine("x is greater than 5");
}
else {
    Console.WriteLine("x is less than or equal to 5");
}
// 循环语句
for (int i = 0; i < 5; i++) {
    Console.WriteLine(i);
}
while (x > 0) {
    Console.WriteLine(x);
    x--;
}

// 函数定义与调用
int Add(int a, int b) {
    return a + b;
}
int result = Add(3, 5);
Console.WriteLine("The result is " + result);

// 类定义
class Person {
    public string Name { get; set; }
    public int Age { get; set; }
    public void Display() {
        Console.WriteLine("Name: " + Name + ", Age: " + Age);
    }
}
// 创建对象
Person person = new Person();
person.Name = "Alice";
person.Age = 25;
person.Display();

try {
    int result = 10 / 0;
}
catch (DivideByZeroException e) {
    Console.WriteLine("Caught exception: " + e.Message);
}

// LINQ查询
List<int> numbers = new List<int> { 1, 2, 3, 4, 5 };
var query = from num in numbers
            where num % 2 == 0
            select num;
foreach (var item in query) {
    Console.WriteLine(item);
}