C＃where select clause

我想從JSON訪問元素並將其綁定到XAML。我的JSON代碼：C＃where select clause

{ 
    "id":1474976, 
    "date":"2014-02-12 20:00:00", 
    "dateiso":"2014-02-12T20:00:00+00:00", 
    "competition_id":831975, 
    "competition":"England Premier League", 
    "group":"", 
    "home_id":9879, 
    "home":"Fulham", 
    "homeshort":"Fulham", 
    "homepath":"fulham", 
    "away_id":8650, 
    "away":"Liverpool", 
    "awayshort":"Liverpool", 
    "awaypath":"liverpool", 
    "status":"Finished", 
    "halftime":[ 
     1, 
     1 
    ], 
    "fulltime":[ 
     2, 
     3 
    ], 
    "extratime":[ 
     0, 
     0 
    ], 
    "penalties":[ 
     0, 
     0 
    ], 
    "incidents":[ 
     { 
     "id":2762178, 
     "type":"Own Goal", 
     "goaltype":"Own goal", 
     "team_id":9879, 
     "team":"Fulham", 
     "teamshort":"Fulham", 
     "teampath":"fulham", 
     "player_id":30831, 
     "player":"Kolo Tour\u00e9", 
     "playershort":"K. Tour\u00e9", 
     "minute":8 
     }, 
     { 
     "id":2762179, 
     "type":"Yellow", 
     "goaltype":null, 
     "team_id":9879, 
     "team":"Fulham", 
     "teamshort":"Fulham", 
     "teampath":"fulham", 
     "player_id":26782, 
     "player":"William Kvist", 
     "playershort":"W. Kvist", 
     "minute":9 
     }, 
     { 
     "id":2762207, 
     "type":"Goal", 
     "goaltype":"Regular goal", 
     "team_id":8650, 
     "team":"Liverpool", 
     "teamshort":"Liverpool", 
     "teampath":"liverpool", 
     "player_id":51553, 
     "player":"Daniel Sturridge", 
     "playershort":"D. Sturridge", 
     "minute":41 
     }, 
     { 
     "id":2762238, 
     "type":"Yellow", 
     "goaltype":null, 
     "team_id":9879, 
     "team":"Fulham", 
     "teamshort":"Fulham", 
     "teampath":"fulham", 
     "player_id":31290, 
     "player":"Sascha Riether", 
     "playershort":"S. Riether", 
     "minute":50 
     }, 
     { 
     "id":2762248, 
     "type":"Yellow", 
     "goaltype":null, 
     "team_id":8650, 
     "team":"Liverpool", 
     "teamshort":"Liverpool", 
     "teampath":"liverpool", 
     "player_id":184536, 
     "player":"Philippe Coutinho", 
     "playershort":"P. Coutinho", 
     "minute":56 
     }, 
     { 
     "id":2762260, 
     "type":"Goal", 
     "goaltype":"Regular goal", 
     "team_id":9879, 
     "team":"Fulham", 
     "teamshort":"Fulham", 
     "teampath":"fulham", 
     "player_id":30352, 
     "player":"Kieran Richardson", 
     "playershort":"K. Richardson", 
     "minute":64 
     }, 
     { 
     "id":2762262, 
     "type":"Yellow", 
     "goaltype":null, 
     "team_id":9879, 
     "team":"Fulham", 
     "teamshort":"Fulham", 
     "teampath":"fulham", 
     "player_id":30352, 
     "player":"Kieran Richardson", 
     "playershort":"K. Richardson", 
     "minute":65 
     }, 
     { 
     "id":2762279, 
     "type":"Goal", 
     "goaltype":"Regular goal", 
     "team_id":8650, 
     "team":"Liverpool", 
     "teamshort":"Liverpool", 
     "teampath":"liverpool", 
     "player_id":184536, 
     "player":"Philippe Coutinho", 
     "playershort":"P. Coutinho", 
     "minute":72 
     }, 
     { 
     "id":2762296, 
     "type":"Yellow", 
     "goaltype":null, 
     "team_id":8650, 
     "team":"Liverpool", 
     "teamshort":"Liverpool", 
     "teampath":"liverpool", 
     "player_id":156008, 
     "player":"Jordan Henderson", 
     "playershort":"J. Henderson", 
     "minute":77 
     }, 
     { 
     "id":2762307, 
     "type":"Goal", 
     "goaltype":"Penalty", 
     "team_id":8650, 
     "team":"Liverpool", 
     "teamshort":"Liverpool", 
     "teampath":"liverpool", 
     "player_id":30618, 
     "player":"Steven Gerrard", 
     "playershort":"S. Gerrard", 
     "minute":90 
     }, 
     { 
     "id":2762311, 
     "type":"Yellow", 
     "goaltype":null, 
     "team_id":9879, 
     "team":"Fulham", 
     "teamshort":"Fulham", 
     "teampath":"fulham", 
     "player_id":30839, 
     "player":"Johnny Heitinga", 
     "playershort":"J. Heitinga", 
     "minute":90 
     }, 
     { 
     "id":2762312, 
     "type":"Yellow", 
     "goaltype":null, 
     "team_id":8650, 
     "team":"Liverpool", 
     "teamshort":"Liverpool", 
     "teampath":"liverpool", 
     "player_id":30618, 
     "player":"Steven Gerrard", 
     "playershort":"S. Gerrard", 
     "minute":90 
     } 
    ] 
}

我的C＃代碼：

GoalsList.ItemsSource = 
     results.Where(x=>x.id==football.Livestring).Select(y=>y.incidents) 
      .Select(z=>z.Select(m=>new 
       { 
        player=m.player.ToString(), 
        goalminute=m.minute.ToString(), 
       })).ToList();

XAML代碼：

<ListBox Name="GoalsList"> 
    <ListBox.ItemTemplate> 
     <DataTemplate> 
     <TextBlock Text="{Binding player}" Foreground="White"> 
      <Run Text="{Binding goalminute}" Foreground="White"></Run> 
     </TextBlock> 
     </DataTemplate> 
    </ListBox.ItemTemplate> 
</ListBox> 



public void getId(object sender, DownloadStringCompletedEventArgs e) 
{ 
    try 
    { 
     if (!string.IsNullOrEmpty(e.Result)) 
     { 
      GoalsList.ItemsSource = results.Where(x => x.id==football.Livestring) 
              .Select(y => y.incidents) 
              .Select(z => z.S‌elect(m => new 
                { 
                 player = m.player, 
                 goalminute = m.minute, 
                })).ToList(); 
     } 
    }

沒有得到球員和goalminute的值。怎麼了？我試圖訪問一些值，他們工作正常，但是當我嘗試訪問事件數組它不work.help

來源

2014-02-15 Nachiket

發佈'結果'代碼，它是如何填充的？ –

此外，你可以確認你的查詢返回一些結果嗎？（通過檢查調試模式） –

是的，GoalList.Itemsource查詢適用於其他某些where子句條件，但可能與此問題有一些樹問題。 – Nachiket

我認爲你需要一個平面列表，但你會得到列表清單。嘗試使用SelectMany這樣的方法：

GoalsList.ItemsSource = results.Where(x => x.id == football.Livestring) 
             .Select(y => y.incidents) 
             .SelectMany(z => z.S‌elect(m => new 
               { 
                player = m.player, 
                goalminute = m.minute, 
               })).ToList();

來源

2014-02-15 13:37:41 Tony

它的工作謝謝:)是什麼問題？ – Nachiket

注意到這一點。 @nachiket - 閱讀[Select Vs SelectMany]（http://stackoverflow.com/questions/958949/difference-between-select-and-selectmany）。 –

1）你可以調試（進入）你的代碼？

2）這將是有用的，如果你可以先分割你LINQ成幾個語句，例如：

var football = results.Where(x => x.id==football.Livestring); 
var incidents = football.Select(y => y.incidents); 
var playerGoalMinute = incidents.Select(z => z.S‌elect(m => new 
               { 
                player = m.player, 
                goalminute = m.minute, 
               }); 
GoalsList.ItemsSource = playerGoalMinute.ToList();

，並檢查是否每個變量（或它的計數）是如預期。

來源

2014-02-15 13:39:18

C＃where select clause

回答

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