從方法獲取返回的結果

Question

我在Windows窗體應用程序上工作，但是有問題。 在GetDataFromFile方法中，我將返回2個集合，但是在按鈕啟動時，如何獲取它們並如圖所示使用它們。

預先謝謝您，如果我的問題很愚蠢，對不起，但是我是新手，無法解決

public Tuple<List<string>,List<string>> GetDataFromFile()
{
    XDocument doc = XDocument.Load("NotificationTasks.xml");
    var dates = doc.Descendants("Date");
    var hours = doc.Descendants("Time");
    var hoursCollection = new List<string>();
    var dateCollection = new List<string>();

    foreach (var date in dates)
    {
        dateCollection.Add(date.Value);
    }

    foreach (var hour in hours)
    {
        hoursCollection.Add(hour.Value);
    }

    return Tuple.Create(hoursCollection,dateCollection);
}


  private void btnStart_Click(object sender, EventArgs e)
    {

//here I must use the two collections from GetDataFromFile()

        foreach (var dates in hoursCollection)
        {
            if (dates == DateTime.Now.Date)
            {
                foreach (var hours in hoursCollection)
                {
                    StartNotificating(new TimeSpan(hours));
                }
            }
        }
    }

Answer 1

您可以定義自己的類以返回數據：

public class FileData
{
    public FileData(IEnumerable<string> hours, IEnumerable<string> dates)
    {
        Hours = hours;
        Dates = dates;
    }

    public IEnumerable<string> Hours { get; }
    public IEnumerable<string> Dates { get; }
}

更改用於獲取數據的方法：

public FileData GetDataFromFile()
{
    // read file etc...
    return new FileData(hoursCollection, datesCollection);
}

然后，您的處理程序是：

private void btnStart_Click(object sender, EventArgs e)
{
    FileData fileData = GetDataFromFile();
    var hoursCollection = fileData.Hours;
    var dateCollection = fileData.Dates;
}

在屬性中使用帶有名稱的類將減少混淆Tuple Item1和Item2的機會。

Answer 2

您也可以使用元組從方法中接收數據類型。

參考： https : //msdn.microsoft.com/zh-cn/library/system.tuple(v=vs.110).aspx

public Tuple<List<string>,List<string>> GetDataFromFile()
{
    XDocument doc = XDocument.Load("NotificationTasks.xml");
    var dates = doc.Descendants("Date");
    var hours = doc.Descendants("Time");
    var hoursCollection = new List<string>();
    var dateCollection = new List<string>();

    foreach (var date in dates)
    {
        dateCollection.Add(date.Value);
    }

    foreach (var hour in hours)
    {
        hoursCollection.Add(hour.Value);
    }

    return Tuple.Create(hoursCollection,dateCollection);
}


  private void btnStart_Click(object sender, EventArgs e)
    {

        //here I must use the two collections from GetDataFromFile()
        Tuple<List<String>,List<String>> t = GetDataFromFile();
        List<String> hoursCollection = t.Item1;
        List<String> dateCollection = t.Item2;

        foreach (var dates in hoursCollection)
        {
            if (dates == DateTime.Now.Date)
            {
                foreach (var hours in hoursCollection)
                {
                    StartNotificating(new TimeSpan(hours));
                }
            }
        }
    }