Question

我正在处理Windows窗体应用程序，我遇到了问题。在GetDataFromFile方法中，我返回了2个集合，但是在buttton上开始我如何获取它们并如图所示使用它们。

提前谢谢你，如果我的问题很愚蠢，我很抱歉，但我是新手，无法弄清楚

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

您可以定义自己的类来返回数据：

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; }
}

更改用于获取数据的方法：

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

您的处理程序是：

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

使用包含属性名称的类可以减少混淆Item1的{{1}}和Item2的可能性。

Answer 2

您也可以使用元组从方法接收数据类型。

参考：https://msdn.microsoft.com/en-us/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));
                }
            }
        }
    }

从方法中获取两个返回的结果

2 个答案: