private void NewsPaper_OnPaperDeleting(NewsPaper updatedNewspaper)
{
if (NewsPapers.Count == 1)
{
NewsPapers.Add(new NewsPaper("创建你的第一份报纸！"));
}
}
/// <summary>
/// 删除一张报纸
/// </summary>
/// <param name="newsPaper">要删除的报纸</param>
static async public Task DeleteNewsPaper(NewsPaper newsPaper)
{
OnPaperDeleting?.Invoke(newsPaper);
var paperListinFile = await ReadListFromFile();
//var index = paperListinFile.IndexOf(newsPaper.newsPaperModel);
paperListinFile.Remove(newsPaper.newsPaperModel);
NewsPapers.Remove(newsPaper);
//3、将paperListinFile重新保存到文件中
await FileIO.WriteBytesAsync(paperListFile, App.ObjectToByteArray(paperListinFile));
OnPaperDeleted?.Invoke(newsPaper);
}
private void NewsPaper_OnPaperAdded(NewsPaper updatedNewspaper)
{
if (PaperPage.thisPaperpage != null)
{
PaperPage.thisPaperpage.NavigationCacheMode = NavigationCacheMode.Disabled;
}
if (NewsPapers.Count == 1 && NewsPapers.First().PaperTitle == "创建你的第一份报纸！")
{
NewsPapers.Clear();
}
NewsPapers.Add(updatedNewspaper);
if (NewsPaper.NewsPapers.Count != 0)
{
paperNavigationView.SelectedItem = updatedNewspaper;
}
}
private async void GetNewsPapersAtBeginning()
{
await NewsPaper.ReadFromFile();
if (NewsPaper.NewsPapers.Count == 0)
{
NewsPapers.Add(new NewsPaper("创建你的第一份报纸！"));
}
//Bindings.Update();
//if(NewsPaper.NewsPapers.Add)
foreach (var paper in NewsPaper.NewsPapers)
{
NewsPapers.Add(paper);
}
paperNavigationView.SelectedItem = NewsPapers.First();
}
/// <summary>
/// 从文件读取报纸列表
/// </summary>
/// <returns></returns>
static public async Task <List <NewsPaper> > ReadFromFile()
{
//1、从文件中获取报纸列表。
var paperListinFile = await ReadListFromFile();
if (paperListinFile == null)
{
return(new List <NewsPaper>());
}
//List<NewsPaper> newsPapers = new List<NewsPaper>();
foreach (var paper in paperListinFile)
{
NewsPapers.Add(new NewsPaper(paper));
}
return(NewsPapers);
}
private void NewsPaper_OnPaperDeleted(NewsPaper newsPaper)
{
NewsPapers.Remove(newsPaper);
paperNavigationView.SelectedItem = NewsPapers.First();
}
/// <summary>
/// 添加报纸
/// </summary>
/// <param name="newsPaper"></param>
static public void AddNewsPaper(NewsPaper newsPaper)
{
OnPaperAdding?.Invoke(newsPaper);
NewsPapers.Add(newsPaper);
OnPaperAdded?.Invoke(newsPaper); //报纸添加后引发
}
