UWP在文件中保存文本

using System;
using System.Text;
using Windows.Storage;
using Windows.Storage.Streams;

public async void SaveTextToFile(string fileName, string text)
{
    StorageFolder storageFolder = ApplicationData.Current.LocalFolder;
    StorageFile file = await storageFolder.CreateFileAsync(fileName, CreationCollisionOption.ReplaceExisting);

    using (IRandomAccessStream stream = await file.OpenAsync(FileAccessMode.ReadWrite))
    {
        using (DataWriter writer = new DataWriter(stream))
        {
            writer.WriteString(text);
            await writer.StoreAsync();
            await stream.FlushAsync();
        }
    }
}