Class AsyncExtensions

Namespace

LinqToDB.Async

Assembly

linq2db.dll

Provides helper methods for asynchronous operations.

public static class AsyncExtensions

Inheritance

object

AsyncExtensions

Inherited Members

object.GetType()

object.MemberwiseClone()

object.ToString()

object.Equals(object)

object.Equals(object, object)

object.ReferenceEquals(object, object)

object.GetHashCode()

Methods

AllAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource, bool>>, CancellationToken)

public static Task<bool> AllAsync<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, bool>> predicate, CancellationToken token = default)

Parameters

source IQueryable<TSource>

predicate Expression<Func<TSource, bool>>

token CancellationToken

Returns

Task<bool>

Type Parameters

TSource

AnyAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource, bool>>, CancellationToken)

public static Task<bool> AnyAsync<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, bool>> predicate, CancellationToken token = default)

Parameters

source IQueryable<TSource>

predicate Expression<Func<TSource, bool>>

token CancellationToken

Returns

Task<bool>

Type Parameters

TSource

AnyAsync<TSource>(IQueryable<TSource>, CancellationToken)

public static Task<bool> AnyAsync<TSource>(this IQueryable<TSource> source, CancellationToken token = default)

Parameters

source IQueryable<TSource>

token CancellationToken

Returns

Task<bool>

Type Parameters

TSource

AsAsyncEnumerable<TSource>(IQueryable<TSource>)

Returns an IAsyncEnumerable<T> that can be enumerated asynchronously.

public static IAsyncEnumerable<TSource> AsAsyncEnumerable<TSource>(this IQueryable<TSource> source)

Parameters

source IQueryable<TSource>

Source sequence.

Returns

IAsyncEnumerable<TSource>

A query that can be enumerated asynchronously.

Type Parameters

TSource

Source sequence element type.

AverageAsync(IQueryable<decimal>, CancellationToken)

public static Task<decimal> AverageAsync(this IQueryable<decimal> source, CancellationToken token = default)

Parameters

source IQueryable<decimal>

token CancellationToken

Returns

Task<decimal>

AverageAsync(IQueryable<double>, CancellationToken)

public static Task<double> AverageAsync(this IQueryable<double> source, CancellationToken token = default)

Parameters

source IQueryable<double>

token CancellationToken

Returns

Task<double>

AverageAsync(IQueryable<int>, CancellationToken)

public static Task<double> AverageAsync(this IQueryable<int> source, CancellationToken token = default)

Parameters

source IQueryable<int>

token CancellationToken

Returns

Task<double>

AverageAsync(IQueryable<long>, CancellationToken)

public static Task<double> AverageAsync(this IQueryable<long> source, CancellationToken token = default)

Parameters

source IQueryable<long>

token CancellationToken

Returns

Task<double>

AverageAsync(IQueryable<decimal?>, CancellationToken)

public static Task<decimal?> AverageAsync(this IQueryable<decimal?> source, CancellationToken token = default)

Parameters

source IQueryable<decimal?>

token CancellationToken

Returns

Task<decimal?>

AverageAsync(IQueryable<double?>, CancellationToken)

public static Task<double?> AverageAsync(this IQueryable<double?> source, CancellationToken token = default)

Parameters

source IQueryable<double?>

token CancellationToken

Returns

Task<double?>

AverageAsync(IQueryable<int?>, CancellationToken)

public static Task<double?> AverageAsync(this IQueryable<int?> source, CancellationToken token = default)

Parameters

source IQueryable<int?>

token CancellationToken

Returns

Task<double?>

AverageAsync(IQueryable<long?>, CancellationToken)

public static Task<double?> AverageAsync(this IQueryable<long?> source, CancellationToken token = default)

Parameters

source IQueryable<long?>

token CancellationToken

Returns

Task<double?>

AverageAsync(IQueryable<float?>, CancellationToken)

public static Task<float?> AverageAsync(this IQueryable<float?> source, CancellationToken token = default)

Parameters

source IQueryable<float?>

token CancellationToken

Returns

Task<float?>

AverageAsync(IQueryable<float>, CancellationToken)

public static Task<float> AverageAsync(this IQueryable<float> source, CancellationToken token = default)

Parameters

source IQueryable<float>

token CancellationToken

Returns

Task<float>

AverageAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource, decimal>>, CancellationToken)

public static Task<decimal> AverageAsync<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, decimal>> selector, CancellationToken token = default)

Parameters

source IQueryable<TSource>

selector Expression<Func<TSource, decimal>>

token CancellationToken

Returns

Task<decimal>

Type Parameters

TSource

AverageAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource, double>>, CancellationToken)

public static Task<double> AverageAsync<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, double>> selector, CancellationToken token = default)

Parameters

source IQueryable<TSource>

selector Expression<Func<TSource, double>>

token CancellationToken

Returns

Task<double>

Type Parameters

TSource

AverageAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource, int>>, CancellationToken)

public static Task<double> AverageAsync<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, int>> selector, CancellationToken token = default)

Parameters

source IQueryable<TSource>

selector Expression<Func<TSource, int>>

token CancellationToken

Returns

Task<double>

Type Parameters

TSource

AverageAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource, long>>, CancellationToken)

public static Task<double> AverageAsync<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, long>> selector, CancellationToken token = default)

Parameters

source IQueryable<TSource>

selector Expression<Func<TSource, long>>

token CancellationToken

Returns

Task<double>

Type Parameters

TSource

AverageAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource, decimal?>>, CancellationToken)

public static Task<decimal?> AverageAsync<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, decimal?>> selector, CancellationToken token = default)

Parameters

source IQueryable<TSource>

selector Expression<Func<TSource, decimal?>>

token CancellationToken

Returns

Task<decimal?>

Type Parameters

TSource

AverageAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource, double?>>, CancellationToken)

public static Task<double?> AverageAsync<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, double?>> selector, CancellationToken token = default)

Parameters

source IQueryable<TSource>

selector Expression<Func<TSource, double?>>

token CancellationToken

Returns

Task<double?>

Type Parameters

TSource

AverageAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource, int?>>, CancellationToken)

public static Task<double?> AverageAsync<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, int?>> selector, CancellationToken token = default)

Parameters

source IQueryable<TSource>

selector Expression<Func<TSource, int?>>

token CancellationToken

Returns

Task<double?>

Type Parameters

TSource

AverageAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource, long?>>, CancellationToken)

public static Task<double?> AverageAsync<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, long?>> selector, CancellationToken token = default)

Parameters

source IQueryable<TSource>

selector Expression<Func<TSource, long?>>

token CancellationToken

Returns

Task<double?>

Type Parameters

TSource

AverageAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource, float?>>, CancellationToken)

public static Task<float?> AverageAsync<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, float?>> selector, CancellationToken token = default)

Parameters

source IQueryable<TSource>

selector Expression<Func<TSource, float?>>

token CancellationToken

Returns

Task<float?>

Type Parameters

TSource

AverageAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource, float>>, CancellationToken)

public static Task<float> AverageAsync<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, float>> selector, CancellationToken token = default)

Parameters

source IQueryable<TSource>

selector Expression<Func<TSource, float>>

token CancellationToken

Returns

Task<float>

Type Parameters

TSource

ContainsAsync<TSource>(IQueryable<TSource>, TSource, CancellationToken)

public static Task<bool> ContainsAsync<TSource>(this IQueryable<TSource> source, TSource item, CancellationToken token = default)

Parameters

source IQueryable<TSource>

item TSource

token CancellationToken

Returns

Task<bool>

Type Parameters

TSource

CountAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource, bool>>, CancellationToken)

public static Task<int> CountAsync<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, bool>> predicate, CancellationToken token = default)

Parameters

source IQueryable<TSource>

predicate Expression<Func<TSource, bool>>

token CancellationToken

Returns

Task<int>

Type Parameters

TSource

CountAsync<TSource>(IQueryable<TSource>, CancellationToken)

public static Task<int> CountAsync<TSource>(this IQueryable<TSource> source, CancellationToken token = default)

Parameters

source IQueryable<TSource>

token CancellationToken

Returns

Task<int>

Type Parameters

TSource

FirstAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource, bool>>, CancellationToken)

public static Task<TSource> FirstAsync<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, bool>> predicate, CancellationToken token = default)

Parameters

source IQueryable<TSource>

predicate Expression<Func<TSource, bool>>

token CancellationToken

Returns

Task<TSource>

Type Parameters

TSource

FirstAsync<TSource>(IQueryable<TSource>, CancellationToken)

public static Task<TSource> FirstAsync<TSource>(this IQueryable<TSource> source, CancellationToken token = default)

Parameters

source IQueryable<TSource>

token CancellationToken

Returns

Task<TSource>

Type Parameters

TSource

FirstOrDefaultAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource, bool>>, CancellationToken)

public static Task<TSource?> FirstOrDefaultAsync<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, bool>> predicate, CancellationToken token = default)

Parameters

source IQueryable<TSource>

predicate Expression<Func<TSource, bool>>

token CancellationToken

Returns

Task<TSource>

Type Parameters

TSource

FirstOrDefaultAsync<TSource>(IQueryable<TSource>, CancellationToken)

public static Task<TSource?> FirstOrDefaultAsync<TSource>(this IQueryable<TSource> source, CancellationToken token = default)

Parameters

source IQueryable<TSource>

token CancellationToken

Returns

Task<TSource>

Type Parameters

TSource

ForEachAsync<TSource>(IQueryable<TSource>, Action<TSource>, CancellationToken)

Asynchronously apply provided action to each element in source sequence. Sequence elements processed sequentially.

public static Task ForEachAsync<TSource>(this IQueryable<TSource> source, Action<TSource> action, CancellationToken token = default)

Parameters

source IQueryable<TSource>

Source sequence.

action Action<TSource>

Action to apply to each sequence element.

token CancellationToken

Optional asynchronous operation cancellation token.

Returns

Task

Asynchronous operation completion task.

Type Parameters

TSource

Source sequence element type.

ForEachUntilAsync<TSource>(IQueryable<TSource>, Func<TSource, bool>, CancellationToken)

Asynchronously apply provided function to each element in source sequence sequentially. Sequence enumeration stops if function returns false.

public static Task ForEachUntilAsync<TSource>(this IQueryable<TSource> source, Func<TSource, bool> func, CancellationToken token = default)

Parameters

source IQueryable<TSource>

Source sequence.

func Func<TSource, bool>

Function to apply to each sequence element. Returning false from function will stop numeration.

token CancellationToken

Optional asynchronous operation cancellation token.

Returns

Task

Asynchronous operation completion task.

Type Parameters

TSource

Source sequence element type.

LongCountAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource, bool>>, CancellationToken)

public static Task<long> LongCountAsync<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, bool>> predicate, CancellationToken token = default)

Parameters

source IQueryable<TSource>

predicate Expression<Func<TSource, bool>>

token CancellationToken

Returns

Task<long>

Type Parameters

TSource

LongCountAsync<TSource>(IQueryable<TSource>, CancellationToken)

public static Task<long> LongCountAsync<TSource>(this IQueryable<TSource> source, CancellationToken token = default)

Parameters

source IQueryable<TSource>

token CancellationToken

Returns

Task<long>

Type Parameters

TSource

MaxAsync<TSource>(IQueryable<TSource>, CancellationToken)

public static Task<TSource?> MaxAsync<TSource>(this IQueryable<TSource> source, CancellationToken token = default)

Parameters

source IQueryable<TSource>

token CancellationToken

Returns

Task<TSource>

Type Parameters

TSource

MaxAsync<TSource, TResult>(IQueryable<TSource>, Expression<Func<TSource, TResult>>, CancellationToken)

public static Task<TResult?> MaxAsync<TSource, TResult>(this IQueryable<TSource> source, Expression<Func<TSource, TResult>> selector, CancellationToken token = default)

Parameters

source IQueryable<TSource>

selector Expression<Func<TSource, TResult>>

token CancellationToken

Returns

Task<TResult>

Type Parameters

TSource

TResult

MinAsync<TSource>(IQueryable<TSource>, CancellationToken)

public static Task<TSource?> MinAsync<TSource>(this IQueryable<TSource> source, CancellationToken token = default)

Parameters

source IQueryable<TSource>

token CancellationToken

Returns

Task<TSource>

Type Parameters

TSource

MinAsync<TSource, TResult>(IQueryable<TSource>, Expression<Func<TSource, TResult>>, CancellationToken)

public static Task<TResult?> MinAsync<TSource, TResult>(this IQueryable<TSource> source, Expression<Func<TSource, TResult>> selector, CancellationToken token = default)

Parameters

source IQueryable<TSource>

selector Expression<Func<TSource, TResult>>

token CancellationToken

Returns

Task<TResult>

Type Parameters

TSource

TResult

SingleAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource, bool>>, CancellationToken)

public static Task<TSource> SingleAsync<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, bool>> predicate, CancellationToken token = default)

Parameters

source IQueryable<TSource>

predicate Expression<Func<TSource, bool>>

token CancellationToken

Returns

Task<TSource>

Type Parameters

TSource

SingleAsync<TSource>(IQueryable<TSource>, CancellationToken)

public static Task<TSource> SingleAsync<TSource>(this IQueryable<TSource> source, CancellationToken token = default)

Parameters

source IQueryable<TSource>

token CancellationToken

Returns

Task<TSource>

Type Parameters

TSource

SingleOrDefaultAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource, bool>>, CancellationToken)

public static Task<TSource?> SingleOrDefaultAsync<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, bool>> predicate, CancellationToken token = default)

Parameters

source IQueryable<TSource>

predicate Expression<Func<TSource, bool>>

token CancellationToken

Returns

Task<TSource>

Type Parameters

TSource

SingleOrDefaultAsync<TSource>(IQueryable<TSource>, CancellationToken)

public static Task<TSource?> SingleOrDefaultAsync<TSource>(this IQueryable<TSource> source, CancellationToken token = default)

Parameters

source IQueryable<TSource>

token CancellationToken

Returns

Task<TSource>

Type Parameters

TSource

SumAsync(IQueryable<decimal>, CancellationToken)

public static Task<decimal> SumAsync(this IQueryable<decimal> source, CancellationToken token = default)

Parameters

source IQueryable<decimal>

token CancellationToken

Returns

Task<decimal>

SumAsync(IQueryable<double>, CancellationToken)

public static Task<double> SumAsync(this IQueryable<double> source, CancellationToken token = default)

Parameters

source IQueryable<double>

token CancellationToken

Returns

Task<double>

SumAsync(IQueryable<int>, CancellationToken)

public static Task<int> SumAsync(this IQueryable<int> source, CancellationToken token = default)

Parameters

source IQueryable<int>

token CancellationToken

Returns

Task<int>

SumAsync(IQueryable<long>, CancellationToken)

public static Task<long> SumAsync(this IQueryable<long> source, CancellationToken token = default)

Parameters

source IQueryable<long>

token CancellationToken

Returns

Task<long>

SumAsync(IQueryable<decimal?>, CancellationToken)

public static Task<decimal?> SumAsync(this IQueryable<decimal?> source, CancellationToken token = default)

Parameters

source IQueryable<decimal?>

token CancellationToken

Returns

Task<decimal?>

SumAsync(IQueryable<double?>, CancellationToken)

public static Task<double?> SumAsync(this IQueryable<double?> source, CancellationToken token = default)

Parameters

source IQueryable<double?>

token CancellationToken

Returns

Task<double?>

SumAsync(IQueryable<int?>, CancellationToken)

public static Task<int?> SumAsync(this IQueryable<int?> source, CancellationToken token = default)

Parameters

source IQueryable<int?>

token CancellationToken

Returns

Task<int?>

SumAsync(IQueryable<long?>, CancellationToken)

public static Task<long?> SumAsync(this IQueryable<long?> source, CancellationToken token = default)

Parameters

source IQueryable<long?>

token CancellationToken

Returns

Task<long?>

SumAsync(IQueryable<float?>, CancellationToken)

public static Task<float?> SumAsync(this IQueryable<float?> source, CancellationToken token = default)

Parameters

source IQueryable<float?>

token CancellationToken

Returns

Task<float?>

SumAsync(IQueryable<float>, CancellationToken)

public static Task<float> SumAsync(this IQueryable<float> source, CancellationToken token = default)

Parameters

source IQueryable<float>

token CancellationToken

Returns

Task<float>

SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource, decimal>>, CancellationToken)

public static Task<decimal> SumAsync<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, decimal>> selector, CancellationToken token = default)

Parameters

source IQueryable<TSource>

selector Expression<Func<TSource, decimal>>

token CancellationToken

Returns

Task<decimal>

Type Parameters

TSource

SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource, double>>, CancellationToken)

public static Task<double> SumAsync<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, double>> selector, CancellationToken token = default)

Parameters

source IQueryable<TSource>

selector Expression<Func<TSource, double>>

token CancellationToken

Returns

Task<double>

Type Parameters

TSource

SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource, int>>, CancellationToken)

public static Task<int> SumAsync<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, int>> selector, CancellationToken token = default)

Parameters

source IQueryable<TSource>

selector Expression<Func<TSource, int>>

token CancellationToken

Returns

Task<int>

Type Parameters

TSource

SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource, long>>, CancellationToken)

public static Task<long> SumAsync<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, long>> selector, CancellationToken token = default)

Parameters

source IQueryable<TSource>

selector Expression<Func<TSource, long>>

token CancellationToken

Returns

Task<long>

Type Parameters

TSource

SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource, decimal?>>, CancellationToken)

public static Task<decimal?> SumAsync<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, decimal?>> selector, CancellationToken token = default)

Parameters

source IQueryable<TSource>

selector Expression<Func<TSource, decimal?>>

token CancellationToken

Returns

Task<decimal?>

Type Parameters

TSource

SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource, double?>>, CancellationToken)

public static Task<double?> SumAsync<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, double?>> selector, CancellationToken token = default)

Parameters

source IQueryable<TSource>

selector Expression<Func<TSource, double?>>

token CancellationToken

Returns

Task<double?>

Type Parameters

TSource

SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource, int?>>, CancellationToken)

public static Task<int?> SumAsync<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, int?>> selector, CancellationToken token = default)

Parameters

source IQueryable<TSource>

selector Expression<Func<TSource, int?>>

token CancellationToken

Returns

Task<int?>

Type Parameters

TSource

SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource, long?>>, CancellationToken)

public static Task<long?> SumAsync<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, long?>> selector, CancellationToken token = default)

Parameters

source IQueryable<TSource>

selector Expression<Func<TSource, long?>>

token CancellationToken

Returns

Task<long?>

Type Parameters

TSource

SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource, float?>>, CancellationToken)

public static Task<float?> SumAsync<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, float?>> selector, CancellationToken token = default)

Parameters

source IQueryable<TSource>

selector Expression<Func<TSource, float?>>

token CancellationToken

Returns

Task<float?>

Type Parameters

TSource

SumAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource, float>>, CancellationToken)

public static Task<float> SumAsync<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, float>> selector, CancellationToken token = default)

Parameters

source IQueryable<TSource>

selector Expression<Func<TSource, float>>

token CancellationToken

Returns

Task<float>

Type Parameters

TSource

ToArrayAsync<TSource>(IQueryable<TSource>, CancellationToken)

Asynchronously loads data from query to an array.

public static Task<TSource[]> ToArrayAsync<TSource>(this IQueryable<TSource> source, CancellationToken token = default)

Parameters

source IQueryable<TSource>

Source query.

token CancellationToken

Optional asynchronous operation cancellation token.

Returns

Task<TSource[]>

Array with query results.

Type Parameters

TSource

Query element type.

ToDictionaryAsync<TSource, TKey>(IQueryable<TSource>, Func<TSource, TKey>, IEqualityComparer<TKey>, CancellationToken)

Asynchronously loads data from query to a dictionary.

public static Task<Dictionary<TKey, TSource>> ToDictionaryAsync<TSource, TKey>(this IQueryable<TSource> source, Func<TSource, TKey> keySelector, IEqualityComparer<TKey> comparer, CancellationToken token = default) where TKey : notnull

Parameters

source IQueryable<TSource>

Source query.

keySelector Func<TSource, TKey>

Source element key selector.

comparer IEqualityComparer<TKey>

Dictionary key comparer.

token CancellationToken

Optional asynchronous operation cancellation token.

Returns

Task<Dictionary<TKey, TSource>>

Dictionary with query results.

Type Parameters

TSource

Query element type.

TKey

Dictionary key type.

ToDictionaryAsync<TSource, TKey>(IQueryable<TSource>, Func<TSource, TKey>, CancellationToken)

Asynchronously loads data from query to a dictionary.

public static Task<Dictionary<TKey, TSource>> ToDictionaryAsync<TSource, TKey>(this IQueryable<TSource> source, Func<TSource, TKey> keySelector, CancellationToken token = default) where TKey : notnull

Parameters

source IQueryable<TSource>

Source query.

keySelector Func<TSource, TKey>

Source element key selector.

token CancellationToken

Optional asynchronous operation cancellation token.

Returns

Task<Dictionary<TKey, TSource>>

Dictionary with query results.

Type Parameters

TSource

Query element type.

TKey

Dictionary key type.

ToDictionaryAsync<TSource, TKey, TElement>(IQueryable<TSource>, Func<TSource, TKey>, Func<TSource, TElement>, IEqualityComparer<TKey>, CancellationToken)

Asynchronously loads data from query to a dictionary.

public static Task<Dictionary<TKey, TElement>> ToDictionaryAsync<TSource, TKey, TElement>(this IQueryable<TSource> source, Func<TSource, TKey> keySelector, Func<TSource, TElement> elementSelector, IEqualityComparer<TKey> comparer, CancellationToken token = default) where TKey : notnull

Parameters

source IQueryable<TSource>

Source query.

keySelector Func<TSource, TKey>

Source element key selector.

elementSelector Func<TSource, TElement>

Dictionary element selector.

comparer IEqualityComparer<TKey>

Dictionary key comparer.

token CancellationToken

Optional asynchronous operation cancellation token.

Returns

Task<Dictionary<TKey, TElement>>

Dictionary with query results.

Type Parameters

TSource

Query element type.

TKey

Dictionary key type.

TElement

Dictionary element type.

ToDictionaryAsync<TSource, TKey, TElement>(IQueryable<TSource>, Func<TSource, TKey>, Func<TSource, TElement>, CancellationToken)

Asynchronously loads data from query to a dictionary.

public static Task<Dictionary<TKey, TElement>> ToDictionaryAsync<TSource, TKey, TElement>(this IQueryable<TSource> source, Func<TSource, TKey> keySelector, Func<TSource, TElement> elementSelector, CancellationToken token = default) where TKey : notnull

Parameters

source IQueryable<TSource>

Source query.

keySelector Func<TSource, TKey>

Source element key selector.

elementSelector Func<TSource, TElement>

Dictionary element selector.

token CancellationToken

Optional asynchronous operation cancellation token.

Returns

Task<Dictionary<TKey, TElement>>

Dictionary with query results.

Type Parameters

TSource

Query element type.

TKey

Dictionary key type.

TElement

Dictionary element type.

ToListAsync<TSource>(IQueryable<TSource>, CancellationToken)

Asynchronously loads data from query to a list.

public static Task<List<TSource>> ToListAsync<TSource>(this IQueryable<TSource> source, CancellationToken token = default)

Parameters

source IQueryable<TSource>

Source query.

token CancellationToken

Optional asynchronous operation cancellation token.

Returns

Task<List<TSource>>

List with query results.

Type Parameters

TSource

Query element type.

ToLookupAsync<TSource, TKey>(IQueryable<TSource>, Func<TSource, TKey>, IEqualityComparer<TKey>?, CancellationToken)

Asynchronously creates a ILookup<TKey, TElement> from an IEnumerable<T> according to a specified key selector function.

public static Task<ILookup<TKey, TSource>> ToLookupAsync<TSource, TKey>(this IQueryable<TSource> source, Func<TSource, TKey> keySelector, IEqualityComparer<TKey>? comparer, CancellationToken token = default) where TKey : notnull

Parameters

source IQueryable<TSource>

The IQueryable<T> to create a ILookup<TKey, TElement> from.

keySelector Func<TSource, TKey>

A function to extract a key from each element.

comparer IEqualityComparer<TKey>

An IEqualityComparer<T> to compare keys.

token CancellationToken

Optional asynchronous operation cancellation token.

Returns

Task<ILookup<TKey, TSource>>

A ILookup<TKey, TElement> that contains keys and values. The values within each group are in the same order as in source.

Type Parameters

TSource

The type of the elements of source.

TKey

The type of the key returned by keySelector.

ToLookupAsync<TSource, TKey>(IQueryable<TSource>, Func<TSource, TKey>, CancellationToken)

Asynchronously creates a ILookup<TKey, TElement> from an IEnumerable<T> according to a specified key selector function.

public static Task<ILookup<TKey, TSource>> ToLookupAsync<TSource, TKey>(this IQueryable<TSource> source, Func<TSource, TKey> keySelector, CancellationToken token = default) where TKey : notnull

Parameters

source IQueryable<TSource>

The IQueryable<T> to create a ILookup<TKey, TElement> from.

keySelector Func<TSource, TKey>

A function to extract a key from each element.

token CancellationToken

Optional asynchronous operation cancellation token.

Returns

Task<ILookup<TKey, TSource>>

A ILookup<TKey, TElement> that contains keys and values. The values within each group are in the same order as in source.

Type Parameters

TSource

The type of the elements of source.

TKey

The type of the key returned by keySelector.

ToLookupAsync<TSource, TKey, TElement>(IQueryable<TSource>, Func<TSource, TKey>, Func<TSource, TElement>, IEqualityComparer<TKey>?, CancellationToken)

Asynchronously creates a ILookup<TKey, TElement> from an IEnumerable<T> according to a specified key selector function.

public static Task<ILookup<TKey, TElement>> ToLookupAsync<TSource, TKey, TElement>(this IQueryable<TSource> source, Func<TSource, TKey> keySelector, Func<TSource, TElement> elementSelector, IEqualityComparer<TKey>? comparer, CancellationToken token = default) where TKey : notnull

Parameters

source IQueryable<TSource>

The IQueryable<T> to create a ILookup<TKey, TElement> from.

keySelector Func<TSource, TKey>

A function to extract a key from each element.

elementSelector Func<TSource, TElement>

A transform function to produce a result element value from each element.

comparer IEqualityComparer<TKey>

An IEqualityComparer<T> to compare keys.

token CancellationToken

Optional asynchronous operation cancellation token.

Returns

Task<ILookup<TKey, TElement>>

A ILookup<TKey, TElement> that contains keys and values. The values within each group are in the same order as in source.

Type Parameters

TSource

The type of the elements of source.

TKey

The type of the key returned by keySelector.

TElement

The type of the value returned by elementSelector.

ToLookupAsync<TSource, TKey, TElement>(IQueryable<TSource>, Func<TSource, TKey>, Func<TSource, TElement>, CancellationToken)

Asynchronously creates a ILookup<TKey, TElement> from an IEnumerable<T> according to a specified key selector function.

public static Task<ILookup<TKey, TElement>> ToLookupAsync<TSource, TKey, TElement>(this IQueryable<TSource> source, Func<TSource, TKey> keySelector, Func<TSource, TElement> elementSelector, CancellationToken token = default) where TKey : notnull

Parameters

source IQueryable<TSource>

The IQueryable<T> to create a ILookup<TKey, TElement> from.

keySelector Func<TSource, TKey>

A function to extract a key from each element.

elementSelector Func<TSource, TElement>

A transform function to produce a result element value from each element.

token CancellationToken

Optional asynchronous operation cancellation token.

Returns

Task<ILookup<TKey, TElement>>

A ILookup<TKey, TElement> that contains keys and values. The values within each group are in the same order as in source.

Type Parameters

TSource

The type of the elements of source.

TKey

The type of the key returned by keySelector.

TElement

The type of the value returned by elementSelector.