我在過濾嵌套在更大列表中的字符串列表時遇到問題。我嘗試過這樣的事情：myList.FindAll(d => d.activities.Any(i => i.type.Contains("read")));但似乎有人正在回歸我有一個“UserData”結構，如圖所示：public class UserData{ public int id; public List<UserActivity> activities;}public class UserActivity{ public string activity; public string type;}有f.ex。兩種類型的活動（“讀”和“寫”）我想做的是過濾給定的內容，List<UserData> myList如圖所示List<UserData> newList = new List<UserData>();foreach(UserData d in myList){ UserData newD = new UserData(); newD.id = d.id; newD.activities= d.activities.FindAll(i =>i.type.Contains("read")); if (newD.activities.Any()) newList.Add(newD);}有沒有辦法用 Linq 查詢巧妙地做到這一點？我想要弄清楚的是一個簡短而整潔的 Linq 查詢來過濾我所描述的嵌套列表......我知道這可能是一個裝飾問題，但它仍然讓我很困擾。
3 回答
蕭十郎
TA貢獻1815條經驗 獲得超13個贊
var newList = (from userData in myList
let newActivities = userData.activities.Where(i => i.type.Contains("read"))
where newActivities.Any()
select new UserData { id = userData.id, activities = newActivities.ToList() }).ToList();
慕俠2389804
TA貢獻1719條經驗 獲得超6個贊
我通過使用解決了這個問題：
newList = myList.Where(d => d.activities.Any(act => act.type.Contains("read")))
.Select(d => new UserData { id = d.id, activities = new List<UserActivity>( d.activities.FindAll(act => act.type.Contains("read")) ) })
.ToList();
慕尼黑8549860
TA貢獻1818條經驗 獲得超11個贊
嘗試以下操作：
List<UserData> newList = myList.Select(x => new UserData() { id = x.id, activities = x.activities.Where(y => y.type.Contains("read")).ToList() })
.Where(x => x.activities.Count > 0)
.ToList();- 3 回答
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