循环到IEnumerable列表中的特定值

IEnumerable<int> numbers = new List<int> { 1, 2, 3, 4, 5 };
int targetValue = 3;
bool found = false;

foreach (int number in numbers)
{
    if (number == targetValue)
    {
        found = true;
        Console.WriteLine("找到了特定值: " + targetValue);
        break; // 找到后可以提前退出循环
    }
}

if (!found)
{
    Console.WriteLine("未找到特定值: " + targetValue);
}

IEnumerable<int> numbers = new List<int> { 1, 2, 3, 4, 5 };
int targetValue = 3;

var result = numbers.FirstOrDefault(n => n == targetValue);

if (result != default(int))
{
    Console.WriteLine("找到了特定值: " + result);
}
else
{
    Console.WriteLine("未找到特定值: " + targetValue);
}

IEnumerable<int> numbers = new List<int> { 1, 2, 3, 4, 5 };
int targetValue = 3;

bool exists = numbers.Any(n => n == targetValue);

if (exists)
{
    Console.WriteLine("找到了特定值: " + targetValue);
}
else
{
    Console.WriteLine("未找到特定值: " + targetValue);
}