c# - WinRT 中最后一次编辑 xml 文件的时间 - Windows 8 - Metro App

Question

我的问题如下。我想知道是否有可能知道 xml 文件的最后编辑时间。

目前我正在创建我的 xml 并通过以下方式从我的 xml 中读取：

这是写作部分，我正在序列化一个可观察的集合：

XmlSerializer xs = new XmlSerializer(typeof(ObservableCollection<DomExistingVacationDays>));
                using (IRandomAccessStream sessionRandomAccess = await VacationRequestOfflineHolidaysFile.OpenAsync(FileAccessMode.ReadWrite))
                {
                    using (IOutputStream sessionOutputStream = sessionRandomAccess.GetOutputStreamAt(0))
                    {
                        using (StreamWriter wr = new StreamWriter(sessionOutputStream.AsStreamForWrite()))
                        {
                            xs.Serialize(wr, _existingHolidaysCollection);
                        }
                    }

                }

这是阅读部分，反序列化可观察的集合：

 XmlSerializer xs = new XmlSerializer(typeof(ObservableCollection<DomExistingVacationDays>));
                using (IRandomAccessStream sessionRandomAccess = await VacationRequestOfflineHolidaysFile.OpenAsync(FileAccessMode.ReadWrite))
                {
                    using (IInputStream sessionInputStream = sessionRandomAccess.GetInputStreamAt(0))
                    {
                        using (StreamReader rd = new StreamReader(sessionInputStream.AsStreamForRead()))
                        {
                            _existingHolidaysCollection = xs.Deserialize(rd) as ObservableCollection<DomExistingVacationDays>;
                        }
                    }

                }

我想要实现的是，当 xml 文件中的数据比 let's day 早几天时​​，我不再希望使用它。

所以我可以在 xml 文件中添加一个日期时间，但我想知道这个问题是否没有其他解决方案。

谢谢！

Answer 1

您可能会寻找File.GetCreationTime(path)和/或File.GetLastWriteTime(path)（命名空间 System.IO）。

In Win8 UI apps you may want to use StorageFile.GetBasicPropertiesAsync(). The returned BasicProperties contains DateModified. Also StorageFile.DateCreated could be of interest.

Answer 2

I was able to do this thnx to the help from @JeffRSon by using the StorageFile class. The FileInfo class has been replaced with the StorageFile class in MetroApps. Once i had the storageFile i used following code:

var documentProperties = await OfflineRFile.GetBasicPropertiesAsync();
var dateLastModified = documentProperties.DateModified;

OfflineRFile is my StorageFile.

Thnx for the quick responses