本文整理汇总了C#中System.Windows.Documents.List.ElementAtOrDefault方法的典型用法代码示例。如果您正苦于以下问题：C# List.ElementAtOrDefault方法的具体用法？C# List.ElementAtOrDefault怎么用？C# List.ElementAtOrDefault使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类System.Windows.Documents.List的用法示例。
在下文中一共展示了List.ElementAtOrDefault方法的4个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: BetterMediaPlayer
public BetterMediaPlayer(List<Song> songs)
{
this.songs = songs;
currentSongIndex = 0;
activeSong = songs.ElementAtOrDefault<Song>(currentSongIndex);
using (MediaLibrary library = new MediaLibrary())
{
collectionSongs = library.Songs.ToList();
}
MediaPlayer.ActiveSongChanged += (s, e) =>
{
if (MediaPlayer.Queue.ActiveSong == nextSong)
{
MoveNext();
}
else if (MediaPlayer.Queue.ActiveSong == prevSong)
{
MovePrev();
}
};
MediaPlayer.MediaStateChanged += (s, e) =>
{
if (MediaPlayer.State == MediaState.Stopped)
{
MoveNext();
}
if (MediaPlayer.State == MediaState.Playing)
{
timer.Change(0, 500);
}
else
{
timer.Change(Timeout.Infinite, Timeout.Infinite);
}
RaisePropertyChanged(StatePropertyName);
};
timer = new Timer(
x => RaisePropertyChanged(PlayPositionPropertyName),
null, Timeout.Infinite, Timeout.Infinite);
// Needed, otherwise our counting logic is completely thrown off
// because the order is not maintained between the collection passed
// to MediaPlayer.Play and MediaPlayer.Queue
MediaPlayer.IsShuffled = false;
// TODO Ask the user to take over the music
// TODO Figure out how to clear existing playlist
MediaPlayer.Stop();
// TODO Stop music when they quit the app
}示例2: PhoneApplicationPage_Loaded
private async void PhoneApplicationPage_Loaded(object sender, RoutedEventArgs e)
{
var fb = new Facebook.FacebookClient(App.AccessToken);
var result = await fb.GetTaskAsync("fql",
new
{
//q = "SELECT uid, name, pic_square FROM user WHERE uid IN (SELECT uid2 FROM friend WHERE uid1 = me() LIMIT 25)"
//q = "SELECT aid FROM album WHERE (owner=1383951117)"
q = "SELECT src_big,src_small,target_id FROM photo WHERE pid IN (SELECT pid FROM photo_tag WHERE subject='') OR pid IN (SELECT pid FROM photo WHERE aid IN (SELECT aid FROM album WHERE (owner='1383951117') AND type!='profile')) and place_id in (SELECT page_id FROM place WHERE distance(latitude, longitude, '41.878700', '-87.636620') < '50000')"
});
//System.Threading.Thread.Sleep(4000);
System.Diagnostics.Debug.WriteLine("Result: " + result.ToString());
JObject ob = JObject.Parse(result.ToString());
JArray data = (JArray)ob["data"];
int i;
List<Uri> small=new List<Uri>();
List<Uri> big = new List<Uri>();
for(i=0;i<data.Count;i++)
{
JObject a=(JObject)data[i];
JValue b = (JValue)a["src_big"];
big.Add(new Uri(b.Value.ToString()));
b = (JValue)a["src_small"];
small.Add(new Uri(b.Value.ToString()));
}
my_popup_cs.IsOpen = false;
var GroupedURLs = new List<ImageViewModel>();
for (int j = 0; j < small.Count; j++)
{
var objImageViewModel = new ImageViewModel();
if (small.ElementAtOrDefault(j) != null)
{
objImageViewModel.First = big[j];
objImageViewModel.big = big[j];
}
GroupedURLs.Add(objImageViewModel);
}
ic.ItemsSource = GroupedURLs;
}示例3: MainPage
// Constructor
public MainPage()
{
InitializeComponent();
var URLs = new List<Uri>
{
new Uri("/Delhi.png",UriKind.Relative),
new Uri("/Delhi.png",UriKind.Relative),
new Uri("/Delhi.png",UriKind.Relative),
new Uri("/Delhi.png",UriKind.Relative),
new Uri("/Delhi.png",UriKind.Relative),
new Uri("/Delhi.png",UriKind.Relative),
new Uri("/Delhi.png",UriKind.Relative),
new Uri("/Delhi.png",UriKind.Relative),
new Uri("/Delhi.png",UriKind.Relative),
new Uri("/Delhi.png",UriKind.Relative),
new Uri("/Delhi.png",UriKind.Relative),
new Uri("/Delhi.png",UriKind.Relative),
new Uri("/Delhi.png",UriKind.Relative)
};
my_popup_cs.IsOpen = false;
var GroupedURLs = new List<ImageViewModel>();
for (int i = 0; i < URLs.Count; i++)
{
var objImageViewModel = new ImageViewModel();
if (URLs.ElementAtOrDefault(i) != null)
{
objImageViewModel.First = URLs[i];
objImageViewModel.name = URLs[i].ToString();
}
GroupedURLs.Add(objImageViewModel);
}
ic.ItemsSource = GroupedURLs;
}示例4: pickThreeQuestions
// Väljer ut tre frågor till en array från en list som läses in i readQuestion()
private void pickThreeQuestions(List<string> idList, int antalID, int fraga)
{
// Om man svarat på tre frågor stängs fönstret.
if (fraga > 2)
{
fraga = 0;
questAnswered = 0;
timer.Stop();
// Några if-satser för att kolla vem som har spelat och vem som inte har, allt för logiken när vi spelar
if (UserName.spelarNummer == "1")
{
DBconnect.openDB("UPDATE `Match` SET Spelare1Spelat = 1 WHERE MatchID = " + UserName.MatchID);
DBconnect.DataReader.Read();
DBconnect.DataReader.Close();
DBconnect.Connection.Close();
}
else // Spelare2
{
DBconnect.openDB("UPDATE `Match` SET Spelare2Spelat = 1 WHERE MatchID = " + UserName.MatchID);
DBconnect.DataReader.Read();
DBconnect.DataReader.Close();
DBconnect.Connection.Close();
}
DBconnect.openDB("SELECT * FROM `Match` WHERE MatchID = " + UserName.MatchID);
DBconnect.DataReader.Read();
// Om båda har spelat denna runda ökar rundan med +1 och att de båda har spelat minskar till 0
if (Convert.ToString(DBconnect.DataReader["Spelare1Spelat"]) == "1" && Convert.ToString(DBconnect.DataReader["Spelare2Spelat"]) == "1")
{
DBconnect.DataReader.Close();
DBconnect.Connection.Close();
DBconnect.openDB("UPDATE `Match` SET Runda = Runda+" + 1 + " WHERE MatchID = " + UserName.MatchID + "; " +
"UPDATE `Match` SET Spelare1Spelat = 0 WHERE MatchID = " + UserName.MatchID + "; " +
"UPDATE `Match` SET Spelare2Spelat = 0 WHERE MatchID = " + UserName.MatchID + ";");
DBconnect.DataReader.Read();
DBconnect.Connection.Close();
DBconnect.DataReader.Close();
// Ändrar rating för medlemmen.
changeRating();
}
Switcher.Switch(new Meny());
}
// Hämtar ny fråga om man svarat på första frågan.
else if (fraga > 0)
{
setQuestion(arrayFragorRunda[fraga]);
}
// Slumpar ut tre frågor från en lista som skapats i readQuestion()
else
{
DBconnect.openDB("SELECT * FROM `Match` WHERE MatchID = " + UserName.MatchID);
DBconnect.DataReader.Read();
if (Convert.ToString(DBconnect.DataReader["FragorRunda" + Convert.ToString(DBconnect.DataReader["Runda"])]) != "TOM")
{
DBconnect.DataReader.Close();
splitFragor();
}
else if (Convert.ToString(DBconnect.DataReader["FragorRunda" + Convert.ToString(DBconnect.DataReader["Runda"])]) == "TOM")
{
for (int i = 0; i < 3; i++)
{
Random random = new Random();
int num = random.Next(antalID);
//Tar FragorID på positionen num
idFragaArray[i] = idList.ElementAtOrDefault(num);
idList.RemoveAt(num);
antalID--;
}
// Lägger in de utvalda frågorna i databsen till en specifik runda i en specifik match.
DBconnect.openDB("UPDATE `Match` SET FragorRunda" + Convert.ToString(DBconnect.DataReader["Runda"]) + " = '" + idFragaArray[0] + "_" + idFragaArray[1] + "_" + idFragaArray[2] + "' WHERE MatchID = " + UserName.MatchID);
DBconnect.DataReader.Read();
splitFragor();
}
DBconnect.DataReader.Close();
DBconnect.Connection.Close();
setQuestion(arrayFragorRunda[fraga]);
}
}