foreach 循环内变量前面的文本

使用 foreach 循环是一种在编程中常用的迭代方法，它可以帮助我们遍历数组或集合中的元素，并对每个元素执行相同的操作。在 foreach 循环中，我们需要定义一个迭代变量，它会在每次循环中自动被赋值为当前元素。

foreach (类型 变量名 in 数组或集合) {
    // 在这里执行操作
}

python
int[] numbers = {1, 2, 3, 4, 5};
foreach (int num in numbers) {
    Console.WriteLine(num);
}

1
2
3
4
5

python
string[] names = {"Alice", "Bob", "Charlie", "David"};
foreach (string name in names) {
    Console.WriteLine("Hello, " + name + "!");
}

Hello, Alice!
Hello, Bob!
Hello, Charlie!
Hello, David!

python
string[] fruits = {"apple", "banana", "cherry"};
foreach (string fruit in fruits) {
    Console.WriteLine(fruit.ToUpper());
}

APPLE
BANANA
CHERRY

python
List numbers = new List {1, 2, 3, 4, 5};
int sum = 0;
foreach (int number in numbers) {
    sum += number;
}
Console.WriteLine("Sum: " + sum);

Sum: 15

python
class Student {
    public string Name { get; set; }
    public int Score { get; set; }
}
List students = new List {
    new Student {Name = "Alice", Score = 80},
    new Student {Name = "Bob", Score = 90},
    new Student {Name = "Charlie", Score = 70}
};
int totalScore = 0;
foreach (Student student in students) {
    totalScore += student.Score;
}
int averageScore = totalScore / students.Count;
Console.WriteLine("Average score: " + averageScore);

Average score: 80

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

1
2
3
4
5

python
string[] fruits = {"apple", "banana", "cherry"};
for (int i = 0; i < fruits.Length; i++) {
    Console.WriteLine(fruits[i].ToUpper());
}

APPLE
BANANA
CHERRY

python
List numbers = new List {1, 2, 3, 4, 5};
int sum = 0;
for (int i = 0; i < numbers.Count; i++) {
    sum += numbers[i];
}
Console.WriteLine("Sum: " + sum);

Sum: 15

python
class Student {
    public string Name { get; set; }
    public int Score { get; set; }
}
List students = new List {
    new Student {Name = "Alice", Score = 80},
    new Student {Name = "Bob", Score = 90},
    new Student {Name = "Charlie", Score = 70}
};
int totalScore = 0;
for (int i = 0; i < students.Count; i++) {
    totalScore += students[i].Score;
}
int averageScore = totalScore / students.Count;
Console.WriteLine("Average score: " + averageScore);

Average score: 80