public static IEnumerable<T> AlternateElements<T>(this IEnumerable<T> source) { int index = 0; foreach (T element in source) { if (index % 2 == 0) { yield return element; } index++; } } 您可以針對任何可列舉的集合呼叫這個擴充方法,就像從 IEnumerable<T> 介面呼叫其他方法一樣,如下列...
このクエリは、一連の XElements を返します。 この種のクエリの結果から XElements を構築できるようにするために、 XElement コンストラクターを使用すると、要素のシーケンスを引数として直接渡すことができます。 コピー var x = new XElement("People", from p in people where p.Can...
// 1) use Split to break each row (a string) into an array// of strings,// 2) convert the element at position examNum to an int// and select it.varcolumnQuery =fromlineinstrsletelements = line.Split(',')selectConvert.ToInt32(elements[examNum]);// Execute the query ...
You can trigger immediate execution by applying a method that requires access to individual elements of the query result. This can be the result of including an aggregate function, such as Count, Sum, Average, Min, or Max. For more information about aggregate functions, see Aggregate Clause....
checking if elements with values exists in xml Checking overlaps on dates in collection items Chinese Character Encoding not working in C# Choose random value from array with weight Chr(13) in C# Class inheritance and partial classes in C# Class to return a list or single item Classes not reco...
checking if elements with values exists in xml Checking overlaps on dates in collection items Chinese Character Encoding not working in C# Choose random value from array with weight Chr(13) in C# Class inheritance and partial classes in C# Class to return a list or single item Classes not reco...
If there are no items, First and Single will throw an InvalidOperationException with the message “Sequence contains no elements.” FirstOrDefault and SingleOrDefault protect you from the exception by returning the default, which is generally a null (Nothing in VB). Additionally, if you use ...
Max():此方法用于查找集合中的最大值 Min():此方法用于查找集合中的最小值 Average():此方法用于计算集合数字类型的平均值。 Count():此方法计算集合中的元素数量 Aggregate():此方法用于对集合的值执行自定义聚合操作Aggregate 方法用于在序列上应用累加器函数,此方法可用于各种复杂的聚合操作,例如求和值、连接字...
RangeArrayF(-500, 1000); //Create a List<T> with 1000 elements all set to 5.0 var myList = LinqFaster.RepeatListF(5.0, 1000); //Compute sum, average, max,min var sum = myArray.SumF(); var average = myArray.AverageF(); var min = myArray.MinF(); var max = myArray.MaxF(...
E>) -> R) -> SinqSequence<R>intersect - create a sequence with unique elements present in both sequencesintersect<S: Sequence>(sequence: S, equality: (T, T) -> Bool) -> SinqSequence<T> intersect<S: Sequence, K: Hashable>(sequence: S, key: T -> K) -> SinqSequence<T>...