csharp 使用迭代器IEnumerable行读取文件&生成数字

Posted 2021-05-12

static IEnumerable<Stering> ReadLines (string fileName) {
    using (TextReader reader = File.OpenText (fileName)) {
        string line;
        while (line = reader.ReadLine () != null) {
            yield return line;
        }
    }
}

foreach (string line in ReadLines("text.txt"))
{
    System.Console.WriteLine(line);
}

public IEnumerable<int> GetSingleDigitNumbers()
{
    int index = 0;
    while (index++ < 10)
        yield return index;
}