Linq select distinct where
Nettet18. mai 2016 · int [] ids = lst.Select (k => k.ID).Distinct ().ToArray (); List lstResult = new List (); foreach (int id in ids) { var temp = lst.Where (k => k.ID == id).ToList (); double sum = temp.Sum (k => k.Amount); var item = temp [0]; item.Amount = sum; lstResult.Add (item); } Add your solution here … NettetLINQ Select comes under the Projection Operator, the select operator used to select the properties to display/selection. Select operator is mainly used to retrieve all properties or only a few properties which we need to display. It is used to select one or more items from the list of items or from the collection.
Linq select distinct where
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Nettetメソッドは Distinct (IEnumerable, IEqualityComparer) 、重複する値を含む順序なしシーケンスを返します。 if comparer is null, the default equality comparer, Default, is used to compare values. 適用対象 .NET 7 およびその他の … Nettet25. jan. 2024 · c# linq select only unique values from list Kamran Code: C# 2024-01-25 22:39:19 If your requirements are to have no duplicates, you should be using a HashSet. HashSet. Add will return false when the item already exists ( if that even matters to you). 0 nick Code: C# 2024-02-06 18:10:28
Nettet14. sep. 2024 · A LINQ query, often referred to as a query expression, consists of a combination of query clauses that identify the data sources and iteration variables for the query. A query expression can also include instructions for sorting, filtering, grouping, and joining, or calculations to apply to the source data. NettetUsing morelinq you can use DistinctBy: myList.DistinctBy (x => x.id); Otherwise, you can use a group: myList.GroupBy (x => x.id) .Select (g => g.First ()); Share Improve this …
Nettet7. okt. 2024 · you could split it on the pipe for each column in each row, and yeah you could use linq and get a List of distinct countries: List < string > CountryList = new List < string > ();
NettetThe Distinct (IEnumerable) method returns an unordered sequence that contains no duplicate values. It uses the default equality comparer, Default, to …
Nettet21. jul. 2024 · Distinct (); IEnumerable < string > locations = new [] { customers.Select (c => c.City), customers.Select (c => c.Region), customers.Select (c => c.Country), }. SelectMany (s => s). Distinct (); OrderBy / ThenBy IEnumerable orderedProducts1 = products. OrderBy (p => p.Category). ThenByDescending (p => … heart rate below 60 in elderlyNettet我知道在Linq中，我必須在執行Select Distinct之后必須執行OrderBy ，但是我正在嘗試通過在Select之后丟失的Included實體屬性進行訂購。 例如： 當我通過兩個不同參數中的一個or兩個來執行Where ，很有可能獲得重復的結果。 這就是為什么我使用Distinct的原因 mourn the queen not the empireNettet6. okt. 2024 · There are three ways to select distinct objects based on a property using Linq methods: //Simple movies.GroupBy(t => t.YearOfRelease).Select(grp => … mourn someone\\u0027s deathNettet说明：和SQL命令中的select作用相似但位置不同，查询表达式中的select及所接子句是放在表达式最后并把子句中的变量也就是结果返回回来；延迟。 Select/Distinct操作包括9种形式，分别为简单用法、匿名类型形式、条件形式、指定类型形式、筛选形式、整形类型形式、嵌套类型形式、本地方法调用形式 ... mourn the livingNettet6. mai 2024 · The simplest way to go about this, because this may happen in many various ways is to write LINQ about this query SELECT tb2.* FROM dbo.SomeTable tb2 JOIN (SELECT DISTINCT tb.Id FROM dbo.SomeTable tb) tb1 on tb1.Id = tb2.Id This is usually not slower than SELECT DISTINCT tb2.* FROM dbo.SomeTable tb2 Linq may look like: heart rate below 40 during sleepNettet10. mar. 2016 · 使用Linq 提供的扩展方法 Distinct 可以去除序列中的重复元素。 该方法具有以下两种重载形式： （1）public static IEnumerable Distinct (this IEnumerable source) （重载1） 通过 使用 默认的相等比较器对值进行比较并返回序列中的非重复元素。 （2）publicstatic IQueryable Distinct (this IQue C# 中datatable去重的方法 12-31 本文 … mourot industrieNettet試圖做一個SQL查詢 SELECT DISTINCT first,second ,third FROM table 會做什么，但是我正在用LINQ和一個數據SELECT DISTINCT first,second ,third FROM table來做。 編輯 SQL應該看起來像一個Mysql se. heart rate before activity