Nóta
Aðgangur að þessari síðu krefst heimildar. Þú getur prófað aðskrá þig inn eða breyta skráasöfnum.
Aðgangur að þessari síðu krefst heimildar. Þú getur prófað að breyta skráasöfnum.
Element operations return a single, specific element from a sequence.
The standard query operator methods that perform element operations are listed in the following section.
Methods
| Method Name | Description | Visual Basic Query Expression Syntax | More Information |
|---|---|---|---|
| ElementAt | Returns the element at a specified index in a collection. | Not applicable. | Enumerable.ElementAt Queryable.ElementAt |
| ElementAtOrDefault | Returns the element at a specified index in a collection or a default value if the index is out of range. | Not applicable. | Enumerable.ElementAtOrDefault Queryable.ElementAtOrDefault |
| First | Returns the first element of a collection, or the first element that satisfies a condition. | Not applicable. | Enumerable.First Queryable.First |
| FirstOrDefault | Returns the first element of a collection, or the first element that satisfies a condition. Returns a default value if no such element exists. | Not applicable. | Enumerable.FirstOrDefault Queryable.FirstOrDefault Queryable.FirstOrDefault<TSource>(IQueryable<TSource>) |
| Last | Returns the last element of a collection, or the last element that satisfies a condition. | Not applicable. | Enumerable.Last Queryable.Last |
| LastOrDefault | Returns the last element of a collection, or the last element that satisfies a condition. Returns a default value if no such element exists. | Not applicable. | Enumerable.LastOrDefault Queryable.LastOrDefault |
| Single | Returns the only element of a collection, or the only element that satisfies a condition. | Not applicable. | Enumerable.Single Queryable.Single |
| SingleOrDefault | Returns the only element of a collection, or the only element that satisfies a condition. Returns a default value if no such element exists or the collection does not contain exactly one element. | Not applicable. | Enumerable.SingleOrDefault Queryable.SingleOrDefault |
See also
Vertu í samstarfi við okkur á GitHub
Heimildina fyrir þetta efni er að finna á GitHub, þar sem þú getur líka búið til og farið yfir vandamál og sameinað beiðnir. Frekari upplýsingar er að finna í framlagshandbók okkar.
