LINQ-metoder som stöds och som inte stöds (LINQ till entiteter)
Det här avsnittet innehåller information om linq-standardfrågaoperatorerna (Language-Integrated Query) som stöds eller inte stöds i LINQ till entitetsfrågor. Många av LINQ-standardfrågeoperatorerna har en överbelastad version som accepterar ett heltalsargument. Heltalsargumentet motsvarar ett nollbaserat index i sekvensen som körs på, en IEqualityComparer<T>, eller IComparer<T>. Om inget annat anges stöds inte dessa överlagrade versioner av LINQ-standardfrågeoperatorerna, och om du försöker använda dem genereras ett undantag.
Metoder för projektion och begränsning
De flesta LINQ-projektions- och begränsningsmetoder stöds i LINQ till entitetsfrågor, med undantag för dem som accepterar ett positionsargument. Mer information finns i Vanliga frågeoperatorer i LINQ till entitetsfrågor. I följande tabell visas de projektions- och begränsningsmetoder som stöds och inte stöds.
| Metod | Support | Visual Basic-funktionssignatur | C#-metodsignatur |
|---|---|---|---|
| Select | Stöds | Function Select(Of TSource, TResult) ( _ source As IQueryable(Of TSource), _ selector As Expression(Of Func(Of TSource, TResult)) _ ) As IQueryable(Of TResult) |
IQueryable<TResult> Select<TSource, TResult>( this IQueryable<TSource> source, Expression<Func<TSource, TResult>> selector ) |
| Select | Stöds inte | Function Select(Of TSource, TResult) ( _ source As IQueryable(Of TSource), _ selector As Expression(Of Func(Of TSource, Integer, TResult)) _ ) As IQueryable(Of TResult) |
IQueryable<TResult> Select<TSource, TResult>( this IQueryable<TSource> source, Expression<Func<TSource, int, TResult>> selector ) |
| SelectMany | Stöds | Function SelectMany(Of TSource, TResult) ( _ source As IQueryable(Of TSource), _ selector As Expression(Of Func(Of TSource, IEnumerable(Of TResult))) _ ) As IQueryable(Of TResult) |
IQueryable<TResult> SelectMany<TSource, TResult>( this IQueryable<TSource> source, Expression<Func<TSource, IEnumerable<TResult>>> selector ) |
| SelectMany | Stöds inte | Function SelectMany(Of TSource, TResult) ( _ source As IQueryable(Of TSource), _ selector As Expression(Of Func(Of TSource, Integer, IEnumerable(Of TResult))) _ ) As IQueryable(Of TResult) |
IQueryable<TResult> SelectMany<TSource, TResult>( this IQueryable<TSource> source, Expression<Func<TSource, int, IEnumerable<TResult>>> selector ) |
| SelectMany | Stöds | Function SelectMany(Of TSource, TCollection, TResult) ( _ source As IQueryable(Of TSource), _ collectionSelector As Expression(Of Func(Of TSource, IEnumerable(Of TCollection))), _ resultSelector As Expression(Of Func(Of TSource, TCollection, TResult)) _ ) As IQueryable(Of TResult) |
IQueryable<TResult> SelectMany\<TSource, TCollection, TResult>( this IQueryable<TSource> source, Expression<Func<TSource, IEnumerable<TCollection>>> collectionSelector, Expression<Func\<TSource, TCollection, TResult>> resultSelector ) |
| SelectMany | Stöds inte | Function SelectMany(Of TSource, TCollection, TResult) ( _ source As IQueryable(Of TSource), _ collectionSelector As Expression(Of Func(Of TSource, Integer, IEnumerable(Of TCollection))), _ resultSelector As Expression(Of Func(Of TSource, TCollection, TResult)) _ ) As IQueryable(Of TResult) |
IQueryable<TResult> SelectMany\<TSource, TCollection, TResult>( this IQueryable<TSource> source, Expression<Func<TSource, int, IEnumerable<TCollection>>> collectionSelector, Expression<Func\<TSource, TCollection, TResult>> resultSelector ) |
| Where | Stöds | Function Where(Of TSource) ( _ source As IQueryable(Of TSource), _ predicate As Expression(Of Func(Of TSource, Boolean)) _ ) As IQueryable(Of TSource) |
IQueryable<TSource> Where<TSource>( this IQueryable<TSource> source, Expression<Func\<TSource, bool>> predicate ) |
| Where | Stöds inte | Function Where(Of TSource) ( _ source As IQueryable(Of TSource), _ predicate As Expression(Of Func(Of TSource, Integer, Boolean)) _ ) As IQueryable(Of TSource) |
IQueryable<TSource> Where<TSource>( this IQueryable<TSource> source, Expression<Func\<TSource, int, bool>> predicate ) |
Kopplingsmetoder
LINQ-kopplingsmetoderna stöds i LINQ till entiteter, med undantag för dem som accepterar en IEqualityComparer eftersom jämförelsen inte kan översättas till datakällan. Mer information finns i Vanliga frågeoperatorer i LINQ till entitetsfrågor. I följande tabell visas de anslutningsmetoder som stöds och inte stöds.
| Metod | Support | Visual Basic-funktionssignatur | C#-metodsignatur |
|---|---|---|---|
| GroupJoin | Stöds | Function GroupJoin(Of TOuter, TInner, TKey, TResult) ( _ outer As IQueryable(Of TOuter), _ inner As IEnumerable(Of TInner), _ outerKeySelector As Expression(Of Func(Of TOuter, TKey)), _ innerKeySelector As Expression(Of Func(Of TInner, TKey)), _ resultSelector As Expression(Of Func(Of TOuter, IEnumerable(Of TInner), TResult)) _ ) As IQueryable(Of TResult) |
IQueryable<TResult> GroupJoin<TOuter, TInner, TKey, TResult>( this IQueryable<TOuter> outer, IEnumerable<TInner> inner, Expression<Func<TOuter, TKey>> outerKeySelector, Expression<Func<TInner, TKey>> innerKeySelector, Expression<Func<TOuter, IEnumerable<TInner>, TResult>> resultSelector ) |
| GroupJoin | Stöds inte | Function GroupJoin(Of TOuter, TInner, TKey, TResult) ( _ outer As IQueryable(Of TOuter), _ inner As IEnumerable(Of TInner), _ outerKeySelector As Expression(Of Func(Of TOuter, TKey)), _ innerKeySelector As Expression(Of Func(Of TInner, TKey)), _ resultSelector As Expression(Of Func(Of TOuter, IEnumerable(Of TInner), TResult)), _ comparer As IEqualityComparer(Of TKey) _ ) As IQueryable(Of TResult) |
IQueryable<TResult> GroupJoin\<TOuter, TInner, TKey, TResult>( this IQueryable<TOuter> outer, IEnumerable<TInner> inner, Expression<Func\<TOuter, TKey>> outerKeySelector, Expression<Func\<TInner, TKey>> innerKeySelector, Expression<Func<TOuter, IEnumerable<TInner>, TResult>> resultSelector, IEqualityComparer<TKey> comparer ) |
| Join | Stöds | Function Join(Of TOuter, TInner, TKey, TResult) ( _ outer As IQueryable(Of TOuter), _ inner As IEnumerable(Of TInner), _ outerKeySelector As Expression(Of Func(Of TOuter, TKey)), _ innerKeySelector As Expression(Of Func(Of TInner, TKey)), _ resultSelector As Expression(Of Func(Of TOuter, TInner, TResult)) _ ) As IQueryable(Of TResult) |
IQueryable<TResult> Join<TOuter, TInner, TKey, TResult>( this IQueryable<TOuter> outer, IEnumerable<TInner> inner, Expression<Func<TOuter, TKey>> outerKeySelector, Expression<Func<TInner, TKey>> innerKeySelector, Expression<Func<TOuter, TInner, TResult>> resultSelector ) |
| Join | Stöds inte | Function Join(Of TOuter, TInner, TKey, TResult) ( _ outer As IQueryable(Of TOuter), _ inner As IEnumerable(Of TInner), _ outerKeySelector As Expression(Of Func(Of TOuter, TKey)), _ innerKeySelector As Expression(Of Func(Of TInner, TKey)), _ resultSelector As Expression(Of Func(Of TOuter, TInner, TResult)), _ comparer As IEqualityComparer(Of TKey) _ ) As IQueryable(Of TResult) |
IQueryable<TResult> Join\<TOuter, TInner, TKey, TResult>( this IQueryable<TOuter> outer, IEnumerable<TInner> inner, Expression<Func\<TOuter, TKey>> outerKeySelector, Expression<Func\<TInner, TKey>> innerKeySelector, Expression<Func\<TOuter, TInner, TResult>> resultSelector, IEqualityComparer<TKey> comparer ) |
Ange metoder
De flesta LINQ-uppsättningsmetoder stöds i LINQ till entitetsfrågor, med undantag för dem som använder en EqualityComparer<T>. Mer information finns i Vanliga frågeoperatorer i LINQ till entitetsfrågor. I följande tabell visas de uppsättningsmetoder som stöds och som inte stöds.
| Metod | Support | Visual Basic-funktionssignatur | C#-metodsignatur |
|---|---|---|---|
| All | Stöds | Function All(Of TSource) ( _ source As IQueryable(Of TSource), _ predicate As Expression(Of Func(Of TSource, Boolean)) _ ) As Boolean |
bool All<TSource>( this IQueryable<TSource> source, Expression<Func\<TSource, bool>> predicate ) |
| Any | Stöds | Function Any(Of TSource) ( _ source As IQueryable(Of TSource) _ ) As Boolean |
bool Any<TSource>( this IQueryable<TSource> source ) |
| Any | Stöds | Function Any(Of TSource) ( _ source As IQueryable(Of TSource), _ predicate As Expression(Of Func(Of TSource, Boolean)) _ ) As Boolean |
bool Any<TSource>( this IQueryable<TSource> source, Expression<Func\<TSource, bool>> predicate ) |
| Contains | Stöds | Function Contains(Of TSource) ( _ source As IQueryable(Of TSource), _ item As TSource _ ) As Boolean |
bool Contains<TSource>( this IQueryable<TSource> source, TSource item ) |
| Contains | Stöds inte | Function Contains(Of TSource) ( _ source As IQueryable(Of TSource), _ item As TSource, _ comparer As IEqualityComparer(Of TSource) _ ) As Boolean |
bool Contains<TSource>( this IQueryable<TSource> source, TSource item, IEqualityComparer<TSource> comparer ) |
| Concat | Stöds, men det finns ingen garanti för att ordningen bevaras |
Function Concat(Of TSource) ( _ source1 As IQueryable(Of TSource), _ source2 As IEnumerable(Of TSource) _ ) As IQueryable(Of TSource) |
IQueryable<TSource> Concat<TSource>( this IQueryable<TSource> source1, IEnumerable<TSource> source2 ) |
| DefaultIfEmpty | Stöds | Function DefaultIfEmpty(Of TSource) ( _ source As IQueryable(Of TSource) _ ) As IQueryable(Of TSource) |
IQueryable<TSource> DefaultIfEmpty<TSource>( this IQueryable<TSource> source ) |
| DefaultIfEmpty | Stöds | Function DefaultIfEmpty(Of TSource) ( _ source As IQueryable(Of TSource), _ defaultValue As TSource _ ) As IQueryable(Of TSource) |
IQueryable<TSource> DefaultIfEmpty<TSource>( this IQueryable<TSource> source, TSource defaultValue ) |
| Distinct | Stöds | Function Distinct(Of TSource) ( _ source As IQueryable(Of TSource) _ ) As IQueryable(Of TSource) |
IQueryable<TSource> Distinct<TSource>( this IQueryable<TSource> source ) |
| Distinct | Stöds inte | Function Distinct(Of TSource) ( _ source As IQueryable(Of TSource), _ comparer As IEqualityComparer(Of TSource) _ ) As IQueryable(Of TSource) |
IQueryable<TSource> Distinct<TSource>( this IQueryable<TSource> source, IEqualityComparer<TSource> comparer ) |
| Except | Stöds | Function Except(Of TSource) ( _ source1 As IQueryable(Of TSource), _ source2 As IEnumerable(Of TSource) _ ) As IQueryable(Of TSource) |
IQueryable<TSource> Except<TSource>( this IQueryable<TSource> source1, IEnumerable<TSource> source2 ) |
| Except | Stöds inte | Function Except(Of TSource) ( _ source1 As IQueryable(Of TSource), _ source2 As IEnumerable(Of TSource), _ comparer As IEqualityComparer(Of TSource) _ ) As IQueryable(Of TSource) |
IQueryable<TSource> Except<TSource>( this IQueryable<TSource> source1, IEnumerable<TSource> source2, IEqualityComparer<TSource> comparer ) |
| Intersect | Stöds | Function Intersect(Of TSource) ( _ source1 As IQueryable(Of TSource), _ source2 As IEnumerable(Of TSource) _ ) As IQueryable(Of TSource) |
IQueryable<TSource> Intersect<TSource>( this IQueryable<TSource> source1, IEnumerable<TSource> source2 ) |
| Intersect | Stöds inte | Function Intersect(Of TSource) ( _ source1 As IQueryable(Of TSource), _ source2 As IEnumerable(Of TSource), _ comparer As IEqualityComparer(Of TSource) _ ) As IQueryable(Of TSource) |
IQueryable<TSource> Intersect<TSource>( this IQueryable<TSource> source1, IEnumerable<TSource> source2, IEqualityComparer<TSource> comparer ) |
| Union | Stöds | Function Union(Of TSource) ( _ source1 As IQueryable(Of TSource), _ source2 As IEnumerable(Of TSource) _ ) As IQueryable(Of TSource) |
IQueryable<TSource> Union<TSource>( this IQueryable<TSource> source1, IEnumerable<TSource> source2 ) |
| Union | Stöds inte | Function Union(Of TSource) ( _ source1 As IQueryable(Of TSource), _ source2 As IEnumerable(Of TSource), _ comparer As IEqualityComparer(Of TSource) _ ) As IQueryable(Of TSource) |
IQueryable<TSource> Union<TSource>( this IQueryable<TSource> source1, IEnumerable<TSource> source2, IEqualityComparer<TSource> comparer ) |
Beställningsmetoder
De flesta LINQ-beställningsmetoder stöds i LINQ till entiteter, med undantag för dem som accepterar en IComparer<T>, eftersom jämförelsen inte kan översättas till datakällan. Mer information finns i Vanliga frågeoperatorer i LINQ till entitetsfrågor. I följande tabell visas de ordningsmetoder som stöds och inte stöds.
| Metod | Support | Visual Basic-funktionssignatur | C#-metodsignatur |
|---|---|---|---|
| OrderBy | Stöds | Function OrderBy(Of TSource, TKey) ( _ source As IQueryable(Of TSource), _ keySelector As Expression(Of Func(Of TSource, TKey)) _ ) As IOrderedQueryable(Of TSource) |
IOrderedQueryable<TSource> OrderBy<TSource, TKey>( this IQueryable<TSource> source, Expression<Func<TSource, TKey>> keySelector ) |
| OrderBy | Stöds inte | Function OrderBy(Of TSource, TKey) ( _ source As IQueryable(Of TSource), _ keySelector As Expression(Of Func(Of TSource, TKey)), _ comparer As IComparer(Of TKey) _ ) As IOrderedQueryable(Of TSource) |
IOrderedQueryable<TSource> OrderBy\<TSource, TKey>( this IQueryable<TSource> source, Expression<Func\<TSource, TKey>> keySelector, IComparer<TKey> comparer ) |
| OrderByDescending | Stöds | Function OrderByDescending(Of TSource, TKey) ( _ source As IQueryable(Of TSource), _ keySelector As Expression(Of Func(Of TSource, TKey)) _ ) As IOrderedQueryable(Of TSource) |
IOrderedQueryable<TSource> OrderByDescending<TSource, TKey>( this IQueryable<TSource> source, Expression<Func<TSource, TKey>> keySelector ) |
| OrderByDescending | Stöds inte | Function OrderByDescending(Of TSource, TKey) ( _ source As IQueryable(Of TSource), _ keySelector As Expression(Of Func(Of TSource, TKey)), _ comparer As IComparer(Of TKey) _ ) As IOrderedQueryable(Of TSource) |
IOrderedQueryable<TSource> OrderByDescending\<TSource, TKey>( this IQueryable<TSource> source, Expression<Func\<TSource, TKey>> keySelector, IComparer<TKey> comparer ) |
| ThenBy | Stöds | Function ThenBy(Of TSource, TKey) ( _ source As IOrderedQueryable(Of TSource), _ keySelector As Expression(Of Func(Of TSource, TKey)) _ ) As IOrderedQueryable(Of TSource) |
IOrderedQueryable<TSource> ThenBy<TSource, TKey>( this IOrderedQueryable<TSource> source, Expression<Func<TSource, TKey>> keySelector ) |
| ThenBy | Stöds inte | Function ThenBy(Of TSource, TKey) ( _ source As IOrderedQueryable(Of TSource), _ keySelector As Expression(Of Func(Of TSource, TKey)), _ comparer As IComparer(Of TKey) _ ) As IOrderedQueryable(Of TSource) |
IOrderedQueryable<TSource> ThenBy\<TSource, TKey>( this IOrderedQueryable<TSource> source, Expression<Func\<TSource, TKey>> keySelector, IComparer<TKey> comparer ) |
| ThenByDescending | Stöds | Function ThenByDescending(Of TSource, TKey) ( _ source As IOrderedQueryable(Of TSource), _ keySelector As Expression(Of Func(Of TSource, TKey)) _ ) As IOrderedQueryable(Of TSource) |
IOrderedQueryable<TSource> ThenByDescending<TSource, TKey>( this IOrderedQueryable<TSource> source, Expression<Func<TSource, TKey>> keySelector ) |
| ThenByDescending | Stöds inte | Function ThenByDescending(Of TSource, TKey) ( _ source As IOrderedQueryable(Of TSource), _ keySelector As Expression(Of Func(Of TSource, TKey)), _ comparer As IComparer(Of TKey) _ ) As IOrderedQueryable(Of TSource) |
IOrderedQueryable<TSource> ThenByDescending\<TSource, TKey>( this IOrderedQueryable<TSource> source, Expression<Func\<TSource, TKey>> keySelector, IComparer<TKey> comparer ) |
| Reverse | Stöds inte | Function Reverse(Of TSource) ( _ source As IQueryable(Of TSource) _ ) As IQueryable(Of TSource) |
IQueryable<TSource> Reverse<TSource>( this IQueryable<TSource> source ) |
Grupperingsmetoder
De flesta LINQ-grupperingsmetoder stöds i LINQ till entiteter, med undantag för dem som accepterar en IEqualityComparer<T>, eftersom jämförelsen inte kan översättas till datakällan. Mer information finns i Vanliga frågeoperatorer i LINQ till entitetsfrågor. I följande tabell visas de grupperingsmetoder som stöds och inte stöds.
| Metod | Support | Visual Basic-funktionssignatur | C#-metodsignatur |
|---|---|---|---|
| GroupBy | Stöds | Function GroupBy(Of TSource, TKey) ( _ source As IQueryable(Of TSource), _ keySelector As Expression(Of Func(Of TSource, TKey)) _ ) As IQueryable(Of IGrouping(Of TKey, TSource)) |
IQueryable<IGrouping<TKey, TSource>> GroupBy<TSource, TKey>( this IQueryable<TSource> source, Expression<Func<TSource, TKey>> keySelector ) |
| GroupBy | Stöds inte | Function GroupBy(Of TSource, TKey) ( _ source As IQueryable(Of TSource), _ keySelector As Expression(Of Func(Of TSource, TKey)), _ comparer As IEqualityComparer(Of TKey) _ ) As IQueryable(Of IGrouping(Of TKey, TSource)) |
IQueryable<IGrouping\<TKey, TSource>> GroupBy\<TSource, TKey>( this IQueryable<TSource> source, Expression<Func\<TSource, TKey>> keySelector, IEqualityComparer<TKey> comparer ) |
| GroupBy | Stöds | Function GroupBy(Of TSource, TKey, TElement) ( _ source As IQueryable(Of TSource), _ keySelector As Expression(Of Func(Of TSource, TKey)), _ elementSelector As Expression(Of Func(Of TSource, TElement)) _ ) As IQueryable(Of IGrouping(Of TKey, TElement)) |
IQueryable<IGrouping<TKey, TElement>> GroupBy<TSource, TKey, TElement>( this IQueryable<TSource> source, Expression<Func<TSource, TKey>> keySelector, Expression<Func<TSource, TElement>> elementSelector ) |
| GroupBy | Stöds | Function GroupBy(Of TSource, TKey, TResult) ( _ source As IQueryable(Of TSource), _ keySelector As Expression(Of Func(Of TSource, TKey)), _ resultSelector As Expression(Of Func(Of TKey, IEnumerable(Of TSource), TResult)) _ ) As IQueryable(Of TResult) |
IQueryable<TResult> GroupBy\<TSource, TKey, TResult>( this IQueryable<TSource> source, Expression<Func\<TSource, TKey>> keySelector, Expression<Func<TKey, IEnumerable<TSource>, TResult>> resultSelector ) |
| GroupBy | Stöds inte | Function GroupBy(Of TSource, TKey, TElement) ( _ source As IQueryable(Of TSource), _ keySelector As Expression(Of Func(Of TSource, TKey)), _ elementSelector As Expression(Of Func(Of TSource, TElement)), _ comparer As IEqualityComparer(Of TKey) _ ) As IQueryable(Of IGrouping(Of TKey, TElement)) |
IQueryable<IGrouping\<TKey, TElement>> GroupBy\<TSource, TKey, TElement>( this IQueryable<TSource> source, Expression<Func\<TSource, TKey>> keySelector, Expression<Func\<TSource, TElement>> elementSelector, IEqualityComparer<TKey> comparer |
| GroupBy | Stöds | Function GroupBy(Of TSource, TKey, TElement, TResult) ( _ source As IQueryable(Of TSource), _ keySelector As Expression(Of Func(Of TSource, TKey)), _ elementSelector As Expression(Of Func(Of TSource, TElement)), _ resultSelector As Expression(Of Func(Of TKey, IEnumerable(Of TElement), TResult)) _ ) As IQueryable(Of TResult) |
IQueryable<TResult> GroupBy<TSource, TKey, TElement, TResult>( this IQueryable<TSource> source, Expression<Func<TSource, TKey>> keySelector, Expression<Func<TSource, TElement>> elementSelector, Expression<Func<TKey, IEnumerable<TElement>, TResult>> resultSelector ) |
| GroupBy | Stöds inte | Function GroupBy(Of TSource, TKey, TResult) ( _ source As IQueryable(Of TSource), _ keySelector As Expression(Of Func(Of TSource, TKey)), _ resultSelector As Expression(Of Func(Of TKey, IEnumerable(Of TSource), TResult)), _ comparer As IEqualityComparer(Of TKey) _ ) As IQueryable(Of TResult) |
IQueryable<TResult> GroupBy\<TSource, TKey, TResult>( this IQueryable<TSource> source, Expression<Func\<TSource, TKey>> keySelector, Expression<Func<TKey, IEnumerable<TSource>, TResult>> resultSelector, IEqualityComparer<TKey> comparer ) |
| GroupBy | Stöds inte | Function GroupBy(Of TSource, TKey, TElement, TResult) ( _ source As IQueryable(Of TSource), _ keySelector As Expression(Of Func(Of TSource, TKey)), _ elementSelector As Expression(Of Func(Of TSource, TElement)), _ resultSelector As Expression(Of Func(Of TKey, IEnumerable(Of TElement), TResult)), _ comparer As IEqualityComparer(Of TKey) _ ) As IQueryable(Of TResult) |
IQueryable<TResult> GroupBy<TSource, TKey, TElement, TResult>( this IQueryable<TSource> source, Expression<Func<TSource, TKey>> keySelector, Expression<Func<TSource, TElement>> elementSelector, Expression<Func<TKey, IEnumerable<TElement>, TResult>> resultSelector, IEqualityComparer<TKey> comparer ) |
Aggregerade metoder
De flesta av de aggregeringsmetoder som accepterar primitiva datatyper stöds i LINQ till entiteter. Mer information finns i Vanliga frågeoperatorer i LINQ till entitetsfrågor. I följande tabell visas de aggregeringsmetoder som stöds och som inte stöds.
| Metod | Support | Visual Basic-funktionssignatur | C#-metodsignatur |
|---|---|---|---|
| Aggregate | Stöds inte | Function Aggregate(Of TSource) ( _ source As IQueryable(Of TSource), _ func As Expression(Of Func(Of TSource, TSource, TSource)) _ ) As TSource |
TSource Aggregate<TSource>( this IQueryable<TSource> source, Expression<Func\<TSource, TSource, TSource>> func ) |
| Aggregate | Stöds inte | Function Aggregate(Of TSource, TAccumulate) ( _ source As IQueryable(Of TSource), _ seed As TAccumulate, _ func As Expression(Of Func(Of TAccumulate, TSource, TAccumulate)) _ ) As TAccumulate |
TAccumulate Aggregate<TSource, TAccumulate>( this IQueryable<TSource> source, TAccumulate seed, Expression<Func<TAccumulate, TSource, TAccumulate>> func ) |
| Aggregate | Stöds inte | Function Aggregate(Of TSource, TAccumulate, TResult) ( _ source As IQueryable(Of TSource), _ seed As TAccumulate, _ func As Expression(Of Func(Of TAccumulate, TSource, TAccumulate)), _ selector As Expression(Of Func(Of TAccumulate, TResult)) _ ) As TResult |
TResult Aggregate<TSource, TAccumulate, TResult>( this IQueryable<TSource> source, TAccumulate seed, Expression<Func<TAccumulate, TSource, TAccumulate>> func, Expression<Func<TAccumulate, TResult>> selector ) |
| Average | Stöds | Function Average ( _ source As IQueryable(Of Decimal) _ ) As Decimal |
decimal Average( this IQueryable<decimal> source ) |
| Average | Stöds | Function Average ( _ source As IQueryable(Of Double) _ ) As Double |
double Average( this IQueryable<double> source ) |
| Average | Stöds | Function Average ( _ source As IQueryable(Of Integer) _ ) As Double |
double Average( this IQueryable<int> source ) |
| Average | Stöds | Function Average ( _ source As IQueryable(Of Long) _ ) As Double |
double Average( this IQueryable<long> source ) |
| Average | Stöds | Function Average ( _ source As IQueryable(Of Nullable(Of Decimal)) _ ) As Nullable(Of Decimal) |
Nullable<decimal> Average( this IQueryable<Nullable<decimal>> source ) |
| Average | Stöds | Function Average ( _ source As IQueryable(Of Nullable(Of Double)) _ ) As Nullable(Of Double) |
Nullable<double> Average( this IQueryable<Nullable<double>> source ) |
| Average | Stöds | Function Average ( _ source As IQueryable(Of Nullable(Of Integer)) _ ) As Nullable(Of Double) |
Nullable<double> Average( this IQueryable<Nullable<int>> source ) |
| Average | Stöds | Function Average ( _ source As IQueryable(Of Nullable(Of Long)) _ ) As Nullable(Of Double) |
Nullable<double> Average( this IQueryable<Nullable<long>> source ) |
| Average | Stöds | Function Average ( _ source As IQueryable(Of Nullable(Of Single)) _ ) As Nullable(Of Single) |
Nullable<float> Average( this IQueryable<Nullable<float>> source ) |
| Average | Stöds | Function Average ( _ source As IQueryable(Of Single) _ ) As Single |
float Average( this IQueryable<float> source ) |
| Average | Stöds inte | Function Average(Of TSource) ( _ source As IQueryable(Of TSource), _ selector As Expression(Of Func(Of TSource, Integer)) _ ) As Double |
double Average<TSource>( this IQueryable<TSource> source, Expression<Func\<TSource, int>> selector ) |
| Average | Stöds inte | Function Average(Of TSource) ( _ source As IQueryable(Of TSource), _ selector As Expression(Of Func(Of TSource, Nullable(Of Integer))) _ ) As Nullable(Of Double) |
Nullable<double> Average<TSource>( this IQueryable<TSource> source, Expression<Func<TSource, Nullable<int>>> selector ) |
| Average | Stöds inte | Function Average(Of TSource) ( _ source As IQueryable(Of TSource), _ selector As Expression(Of Func(Of TSource, Long)) _ ) As Double |
double Average<TSource>( this IQueryable<TSource> source, Expression<Func\<TSource, long>> selector ) |
| Average | Stöds inte | Function Average(Of TSource) ( _ source As IQueryable(Of TSource), _ selector As Expression(Of Func(Of TSource, Nullable(Of Long))) _ ) As Nullable(Of Double) |
Nullable<double> Average<TSource>( this IQueryable<TSource> source, Expression<Func<TSource, Nullable<long>>> selector ) |
| Average | Stöds inte | Function Average(Of TSource) ( _ source As IQueryable(Of TSource), _ selector As Expression(Of Func(Of TSource, Single)) _ ) As Single |
float Average<TSource>( this IQueryable<TSource> source, Expression<Func\<TSource, float>> selector ) |
| Average | Stöds inte | Function Average(Of TSource) ( _ source As IQueryable(Of TSource), _ selector As Expression(Of Func(Of TSource, Nullable(Of Single))) _ ) As Nullable(Of Single) |
Nullable<float> Average<TSource>( this IQueryable<TSource> source, Expression<Func<TSource, Nullable<float>>> selector ) |
| Average | Stöds inte | Function Average(Of TSource) ( _ source As IQueryable(Of TSource), _ selector As Expression(Of Func(Of TSource, Double)) _ ) As Double |
double Average<TSource>( this IQueryable<TSource> source, Expression<Func\<TSource, double>> selector ) |
| Average | Stöds inte | Function Average(Of TSource) ( _ source As IQueryable(Of TSource), _ selector As Expression(Of Func(Of TSource, Nullable(Of Double))) _ ) As Nullable(Of Double) |
Nullable<double> Average<TSource>( this IQueryable<TSource> source, Expression<Func<TSource, Nullable<double>>> selector ) |
| Average | Stöds inte | Function Average(Of TSource) ( _ source As IQueryable(Of TSource), _ selector As Expression(Of Func(Of TSource, Decimal)) _ ) As Decimal |
decimal Average<TSource>( this IQueryable<TSource> source, Expression<Func\<TSource, decimal>> selector ) |
| Average | Stöds inte | Function Average(Of TSource) ( _ source As IQueryable(Of TSource), _ selector As Expression(Of Func(Of TSource, Nullable(Of Decimal))) _ ) As Nullable(Of Decimal) |
Nullable<decimal> Average<TSource>( this IQueryable<TSource> source, Expression<Func<TSource, Nullable<decimal>>> selector ) |
| Count | Stöds | Function Count(Of TSource) ( _ source As IQueryable(Of TSource) _ ) As Integer |
int Count<TSource>( this IQueryable<TSource> source ) |
| Count | Stöds inte | Function Count(Of TSource) ( _ source As IQueryable(Of TSource), _ predicate As Expression(Of Func(Of TSource, Boolean)) _ ) As Integer |
int Count<TSource>( this IQueryable<TSource> source, Expression<Func\<TSource, bool>> predicate ) |
| LongCount | Stöds | Function LongCount(Of TSource) ( _ source As IQueryable(Of TSource) _ ) As Long |
long LongCount<TSource>( this IQueryable<TSource> source ) |
| LongCount | Stöds inte | Function LongCount(Of TSource) ( _ source As IQueryable(Of TSource), _ predicate As Expression(Of Func(Of TSource, Boolean)) _ ) As Long |
long LongCount<TSource>( this IQueryable<TSource> source, Expression<Func\<TSource, bool>> predicate ) |
| Max | Stöds | Function Max(Of TSource) ( _ source As IQueryable(Of TSource) _ ) As TSource |
TSource Max<TSource>( this IQueryable<TSource> source ) |
| Max | Stöds inte | Function Max(Of TSource, TResult) ( _ source As IQueryable(Of TSource), _ selector As Expression(Of Func(Of TSource, TResult)) _ ) As TResult |
TResult Max<TSource, TResult>( this IQueryable<TSource> source, Expression<Func<TSource, TResult>> selector ) |
| Min | Stöds | Function Min(Of TSource) ( _ source As IQueryable(Of TSource) _ ) As TSource |
TSource Min<TSource>( this IQueryable<TSource> source ) |
| Min | Stöds inte | Function Min(Of TSource, TResult) ( _ source As IQueryable(Of TSource), _ selector As Expression(Of Func(Of TSource, TResult)) _ ) As TResult |
TResult Min<TSource, TResult>( this IQueryable<TSource> source, Expression<Func<TSource, TResult>> selector ) |
| Sum | Stöds | Function Sum ( _ source As IQueryable(Of Decimal) _ ) As Decimal |
decimal Sum( this IQueryable<decimal> source ) |
| Sum | Stöds | Function Sum ( _ source As IQueryable(Of Double) _ ) As Double |
double Sum( this IQueryable<double> source |
| Sum | Stöds | Function Sum ( _ source As IQueryable(Of Integer) _ ) As Integer |
int Sum( this IQueryable<int> source ) |
| Sum | Stöds | Function Sum ( _ source As IQueryable(Of Long) _ ) As Long |
long Sum( this IQueryable<long> source ) |
| Sum | Stöds | Function Sum ( _ source As IQueryable(Of Nullable(Of Decimal)) _ ) As Nullable(Of Decimal) |
Nullable<decimal> Sum( this IQueryable<Nullable<decimal>> source ) |
| Sum | Stöds | Function Sum ( _ source As IQueryable(Of Nullable(Of Double)) _ ) As Nullable(Of Double) |
Function Sum ( _ source As IQueryable(Of Nullable(Of Double)) _ ) As Nullable(Of Double)Nullable<double> Sum( this IQueryable<Nullable<double>> source ) |
| Sum | Stöds | Function Sum ( _ source As IQueryable(Of Nullable(Of Integer)) _ ) As Nullable(Of Integer) |
Nullable<int> Sum( this IQueryable<Nullable<int>> source ) |
| Sum | Stöds | Function Sum ( _ source As IQueryable(Of Nullable(Of Long)) _ ) As Nullable(Of Long) |
Nullable<long> Sum( this IQueryable<Nullable<long>> source ) |
| Sum | Stöds | Function Sum ( _ source As IQueryable(Of Nullable(Of Single)) _ ) As Nullable(Of Single) |
Nullable<float> Sum( this IQueryable<Nullable<float>> source ) |
| Sum | Stöds | Function Sum ( _ source As IQueryable(Of Single) _ ) As Single |
float Sum( this IQueryable<float> source ) |
| Sum | Stöds inte | Function Sum(Of TSource) ( _ source As IQueryable(Of TSource), _ selector As Expression(Of Func(Of TSource, Integer)) _ ) As Integer |
int Sum<TSource>( this IQueryable<TSource> source, Expression<Func\<TSource, int>> selector ) |
| Sum | Stöds inte | Function Sum(Of TSource) ( _ source As IQueryable(Of TSource), _ selector As Expression(Of Func(Of TSource, Nullable(Of Integer))) _ ) As Nullable(Of Integer) |
Nullable<int> Sum<TSource>( this IQueryable<TSource> source, Expression<Func<TSource, Nullable<int>>> selector ) |
| Sum | Stöds inte | Function Sum(Of TSource) ( _ source As IQueryable(Of TSource), _ selector As Expression(Of Func(Of TSource, Long)) _ ) As Long |
long Sum<TSource>( this IQueryable<TSource> source, Expression<Func\<TSource, long>> selector ) |
| Sum | Stöds inte | Function Sum(Of TSource) ( _ source As IQueryable(Of TSource), _ selector As Expression(Of Func(Of TSource, Nullable(Of Long))) _ ) As Nullable(Of Long) |
Nullable<long> Sum<TSource>( this IQueryable<TSource> source, Expression<Func<TSource, Nullable<long>>> selector ) |
| Sum | Stöds inte | Function Sum(Of TSource) ( _ source As IQueryable(Of TSource), _ selector As Expression(Of Func(Of TSource, Nullable(Of Single))) _ ) As Nullable(Of Single) |
Nullable<float> Sum<TSource>( this IQueryable<TSource> source, Expression<Func<TSource, Nullable<float>>> selector ) |
| Sum | Stöds inte | Function Sum(Of TSource) ( _ source As IQueryable(Of TSource), _ selector As Expression(Of Func(Of TSource, Single)) _ ) As Single |
float Sum<TSource>( this IQueryable<TSource> source, Expression<Func\<TSource, float>> selector ) |
| Sum | Stöds inte | Function Sum(Of TSource) ( _ source As IQueryable(Of TSource), _ selector As Expression(Of Func(Of TSource, Double)) _ ) As Double |
double Sum<TSource>( this IQueryable<TSource> source, Expression<Func\<TSource, double>> selector ) |
| Sum | Stöds inte | Function Sum(Of TSource) ( _ source As IQueryable(Of TSource), _ selector As Expression(Of Func(Of TSource, Nullable(Of Double))) _ ) As Nullable(Of Double) |
Nullable<double> Sum<TSource>( this IQueryable<TSource> source, Expression<Func<TSource, Nullable<double>>> selector ) |
| Sum | Stöds inte | Function Sum(Of TSource) ( _ source As IQueryable(Of TSource), _ selector As Expression(Of Func(Of TSource, Decimal)) _ ) As Decimal |
decimal Sum<TSource>( this IQueryable<TSource> source, Expression<Func\<TSource, decimal>> selector ) |
| Sum | Stöds inte | Function Sum(Of TSource) ( _ source As IQueryable(Of TSource), _ selector As Expression(Of Func(Of TSource, Nullable(Of Decimal))) _ ) As Nullable(Of Decimal) |
Nullable<decimal> Sum<TSource>( this IQueryable<TSource> source, Expression<Func<TSource, Nullable<decimal>>> selector ) |
Typmetoder
LINQ-standardfrågeoperatorerna som hanterar KONVERTERING och testning av CLR-typ stöds i Entity Framework. Endast CLR-typer som mappas till konceptuella modelltyper stöds i LINQ till entiteter. En lista över konceptuella modelltyper finns i Konceptuella modelltyper (CSDL). I följande tabell visas de metoder som stöds och som inte stöds.
| Metod | Support | Visual Basic-funktionssignatur | C#-metodsignatur |
|---|---|---|---|
| Cast | Stöds för primitiva EDM-typer | Function Cast(Of TResult) ( _ source As IQueryable _ ) As IQueryable(Of TResult) |
IQueryable<TResult> Cast<TResult>( this IQueryable source ) |
| OfType | Stöds för EntityType | Function OfType(Of TResult) ( _ source As IQueryable _ ) As IQueryable(Of TResult) |
IQueryable<TResult> OfType<TResult>( this IQueryable source ) |
Växlingsmetoder
Ett antal LINQ-växlingsmetoder stöds inte i LINQ till entitetsfrågor. Mer information finns i Vanliga frågeoperatorer i LINQ till entitetsfrågor. I följande tabell visas de växlingsmetoder som stöds och inte stöds.
| Metod | Support | Visual Basic-funktionssignatur | C#-metodsignatur |
|---|---|---|---|
| ElementAt | Stöds inte | Function ElementAt(Of TSource) ( _ source As IQueryable(Of TSource), _ index As Integer _ ) As TSource |
TSource ElementAt<TSource>( this IQueryable<TSource> source, int index ) |
| ElementAtOrDefault | Stöds inte | Function ElementAtOrDefault(Of TSource) ( _ source As IQueryable(Of TSource), _ index As Integer _ ) As TSource |
TSource ElementAtOrDefault<TSource>( this IQueryable<TSource> source, int index ) |
| First | Stöds | Function First(Of TSource) ( _ source As IQueryable(Of TSource) _ ) As TSource |
TSource First<TSource>( this IQueryable<TSource> source ) |
| First | Stöds | Function First(Of TSource) ( _ source As IQueryable(Of TSource), _ predicate As Expression(Of Func(Of TSource, Boolean)) _ ) As TSource |
TSource First<TSource>( this IQueryable<TSource> source, Expression<Func\<TSource, bool>> predicate ) |
| FirstOrDefault | Stöds | Function FirstOrDefault(Of TSource) ( _ source As IQueryable(Of TSource) _ ) As TSource |
TSource FirstOrDefault<TSource>( this IQueryable<TSource> source ) |
| FirstOrDefault | Stöds | Function FirstOrDefault(Of TSource) ( _ source As IQueryable(Of TSource), _ predicate As Expression(Of Func(Of TSource, Boolean)) _ ) As TSource |
TSource FirstOrDefault<TSource>( this IQueryable<TSource> source, Expression<Func\<TSource, bool>> predicate ) |
| Last | Stöds inte | Function Last(Of TSource) ( _ source As IQueryable(Of TSource) _ ) As TSource |
TSource Last<TSource>( this IQueryable<TSource> source ) |
| Last | Stöds inte | Function Last(Of TSource) ( _ source As IQueryable(Of TSource), _ predicate As Expression(Of Func(Of TSource, Boolean)) _ ) As TSource |
TSource Last<TSource>( this IQueryable<TSource> source, Expression<Func\<TSource, bool>> predicate ) |
| LastOrDefault | Stöds inte | Function LastOrDefault(Of TSource) ( _ source As IQueryable(Of TSource) _ ) As TSource |
TSource LastOrDefault<TSource>( this IQueryable<TSource> source ) |
| LastOrDefault | Stöds inte | Function LastOrDefault(Of TSource) ( _ source As IQueryable(Of TSource), _ predicate As Expression(Of Func(Of TSource, Boolean)) _ ) As TSource |
TSource LastOrDefault<TSource>( this IQueryable<TSource> source, Expression<Func\<TSource, bool>> predicate ) |
| Single | Stöds | Function Single(Of TSource) ( _ source As IQueryable(Of TSource) _ ) As TSource |
TSource Single<TSource>( this IQueryable<TSource> source ) |
| Single | Stöds | Function Single(Of TSource) ( _ source As IQueryable(Of TSource), _ predicate As Expression(Of Func(Of TSource, Boolean)) _ ) As TSource |
TSource Single<TSource>( this IQueryable<TSource> source, Expression<Func\<TSource, bool>> predicate ) |
| SingleOrDefault | Stöds | Function SingleOrDefault(Of TSource) ( _ source As IQueryable(Of TSource) _ ) As TSource |
TSource SingleOrDefault<TSource>( this IQueryable<TSource> source ) |
| SingleOrDefault | Stöds | Function SingleOrDefault(Of TSource) ( _ source As IQueryable(Of TSource), _ predicate As Expression(Of Func(Of TSource, Boolean)) _ ) As TSource |
TSource SingleOrDefault<TSource>( this IQueryable<TSource> source, Expression<Func\<TSource, bool>> predicate ) |
| Skip | Stöds | Function Skip(Of TSource) ( _ source As IQueryable(Of TSource), _ count As Integer _ ) As IQueryable(Of TSource) |
IQueryable<TSource> Skip<TSource>( this IQueryable<TSource> source, int count ) |
| SkipWhile | Stöds inte | Function SkipWhile(Of TSource) ( _ source As IQueryable(Of TSource), _ predicate As Expression(Of Func(Of TSource, Boolean)) _ ) As IQueryable(Of TSource) |
IQueryable<TSource> SkipWhile<TSource>( this IQueryable<TSource> source, Expression<Func\<TSource, bool>> predicate ) |
| SkipWhile | Stöds inte | Function SkipWhile(Of TSource) ( _ source As IQueryable(Of TSource), _ predicate As Expression(Of Func(Of TSource, Integer, Boolean)) _ ) As IQueryable(Of TSource) |
IQueryable<TSource> SkipWhile<TSource>( this IQueryable<TSource> source, Expression<Func\<TSource, int, bool>> predicate ) |
| Take | Stöds | Function Take(Of TSource) ( _ source As IQueryable(Of TSource), _ count As Integer _ ) As IQueryable(Of TSource) |
IQueryable<TSource> Take<TSource>( this IQueryable<TSource> source, int count ) |
| TakeWhile | Stöds inte | Function TakeWhile(Of TSource) ( _ source As IQueryable(Of TSource), _ predicate As Expression(Of Func(Of TSource, Boolean)) _ ) As IQueryable(Of TSource) |
IQueryable<TSource> TakeWhile<TSource>( this IQueryable<TSource> source, Expression<Func\<TSource, bool>> predicate ) |
| TakeWhile | Stöds inte | Function TakeWhile(Of TSource) ( _ source As IQueryable(Of TSource), _ predicate As Expression(Of Func(Of TSource, Integer, Boolean)) _ ) As IQueryable(Of TSource) |
IQueryable<TSource> TakeWhile<TSource>( this IQueryable<TSource> source, Expression<Func\<TSource, int, bool>> predicate ) |