Finally, the difference betweenFirst()andTake(1)is thatFirst()returns the element itself, whileTake(1)returns a sequence of elements that contains exactly one element. .First()will throw an exception if there's no row to be returned, while.FirstOrDefault()will return the default value (NULL...
思考一:在 Google 中搜索时,一开始用的关键字是加双引号的 "Sequence contains no element",这是同事从电话里告知的异常信息,用这个关键字搜不到有价值的信息;当我在现场再现了这个异常后,直接把异常文本复制到 Google 中搜索,此时关键字是加双引号的 "Sequence contains no elements",结果一下子就定位到了问题...
When you start playing with LINQ queries over sequences of elements (e.g. getting min / max value for enumerable source) sooner or later you will come across this one -- the InvalidOperationException (“Sequence contains no elements”). The problem occurs as by default queries like IEnumerabl...
Given an array of integers, find if the array contains any duplicates. Your function should return true if any value appears at least twice in the array, and it should return false if every element is distinct. class Solution(object): def containsDuplicate(self, nums): """ :type nums: L...
I have only one aspect with the following attribute: [Advice(Advice.Type.Around, Advice.Target.Method)] 26>EXEC : error : System.InvalidOperationException: Sequence contains no matching element 26> at System.Linq.Enumerable.First[TSource](IEnumerable1 source, Func2 predicate) ...
Error :” Sequence contains more than one matching element” Error 'Object reference not set to an instance of an object' when trying to call controller. Error "Could not load file or assembly 'Newtonsoft.Json" in unit test project Error 11007: Entity type 'sysdiagram' is not mapped. Error...
1 varresult=myEnumerableCollection.First(x=>x.Name==person.Name); This will throw InvalidOperationException with Sequence contains no matching element. But if you use 1 2 3 varresult=myEnumerableCollection.FirstOrDefault(x=>x.Name==person.Name); ...
error: Sequence contains no matching element Usage: NuGet.CommandLine.XPlat.dll package list [arguments] [options] Arguments: <PROJECT | SOLUTION> A path to a project, solution file or directory. .NET SDK (7.0.306) NuGet Version: 6.4.0.123 ...
Sequence c..我重新下载重新装了 都没有 吧里有个老哥借了个好能用说明不是系统和游戏的问题 应该是账号的问题 目前据说是游戏ID问题 我给客服发邮件了 目前没有回复 重置游戏内容要等到6月16号以后才能重置
If there is no match found then i get the above error "Sequence contains no matching element" and it throws an exception . How can i avoid this ? The First() is going to throw an exception if the criteria is not met. It should be FirstOrDefault(). ...