QueryableExtensions.ToDictionaryAsync Method
Definition
Important
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Overloads
ToDictionaryAsync<TSource,TKey,TElement>(IQueryable<TSource>, Func<TSource,TKey>, Func<TSource,TElement>)
Creates a Dictionary<TKey,TValue> from an IQueryable<T> by enumerating it asynchronously according to a specified key selector and an element selector function.
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
public static System.Threading.Tasks.Task<System.Collections.Generic.Dictionary<TKey,TElement>> ToDictionaryAsync<TSource,TKey,TElement> (this System.Linq.IQueryable<TSource> source, Func<TSource,TKey> keySelector, Func<TSource,TElement> elementSelector);static member ToDictionaryAsync : System.Linq.IQueryable<'Source> * Func<'Source, 'Key> * Func<'Source, 'Element> -> System.Threading.Tasks.Task<System.Collections.Generic.Dictionary<'Key, 'Element>><Extension()>
Public Function ToDictionaryAsync(Of TSource, TKey, TElement) (source As IQueryable(Of TSource), keySelector As Func(Of TSource, TKey), elementSelector As Func(Of TSource, TElement)) As Task(Of Dictionary(Of TKey, TElement))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.
Parameters
- source
- IQueryable<TSource>
An IQueryable<T> to create a Dictionary<TKey,TValue> 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.
Returns
A task that represents the asynchronous operation.
The task result contains a Dictionary<TKey,TValue> that contains values of type
TElement selected from the input sequence.
- Attributes
Remarks
Multiple active operations on the same context instance are not supported. Use 'await' to ensure that any asynchronous operations have completed before calling another method on this context.
Applies to
ToDictionaryAsync<TSource,TKey,TElement>(IQueryable<TSource>, Func<TSource,TKey>, Func<TSource,TElement>, IEqualityComparer<TKey>)
Creates a Dictionary<TKey,TValue> from an IQueryable<T> by enumerating it asynchronously according to a specified key selector function, a comparer, and an element selector function.
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
public static System.Threading.Tasks.Task<System.Collections.Generic.Dictionary<TKey,TElement>> ToDictionaryAsync<TSource,TKey,TElement> (this System.Linq.IQueryable<TSource> source, Func<TSource,TKey> keySelector, Func<TSource,TElement> elementSelector, System.Collections.Generic.IEqualityComparer<TKey> comparer);static member ToDictionaryAsync : System.Linq.IQueryable<'Source> * Func<'Source, 'Key> * Func<'Source, 'Element> * System.Collections.Generic.IEqualityComparer<'Key> -> System.Threading.Tasks.Task<System.Collections.Generic.Dictionary<'Key, 'Element>><Extension()>
Public Function ToDictionaryAsync(Of TSource, TKey, TElement) (source As IQueryable(Of TSource), keySelector As Func(Of TSource, TKey), elementSelector As Func(Of TSource, TElement), comparer As IEqualityComparer(Of TKey)) As Task(Of Dictionary(Of TKey, TElement))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.
Parameters
- source
- IQueryable<TSource>
An IQueryable<T> to create a Dictionary<TKey,TValue> 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.
Returns
A task that represents the asynchronous operation.
The task result contains a Dictionary<TKey,TValue> that contains values of type
TElement selected from the input sequence.
- Attributes
Remarks
Multiple active operations on the same context instance are not supported. Use 'await' to ensure that any asynchronous operations have completed before calling another method on this context.
Applies to
ToDictionaryAsync<TSource,TKey,TElement>(IQueryable<TSource>, Func<TSource,TKey>, Func<TSource,TElement>, CancellationToken)
Creates a Dictionary<TKey,TValue> from an IQueryable<T> by enumerating it asynchronously according to a specified key selector and an element selector function.
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
public static System.Threading.Tasks.Task<System.Collections.Generic.Dictionary<TKey,TElement>> ToDictionaryAsync<TSource,TKey,TElement> (this System.Linq.IQueryable<TSource> source, Func<TSource,TKey> keySelector, Func<TSource,TElement> elementSelector, System.Threading.CancellationToken cancellationToken);static member ToDictionaryAsync : System.Linq.IQueryable<'Source> * Func<'Source, 'Key> * Func<'Source, 'Element> * System.Threading.CancellationToken -> System.Threading.Tasks.Task<System.Collections.Generic.Dictionary<'Key, 'Element>>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.
Parameters
- source
- IQueryable<TSource>
An IQueryable<T> to create a Dictionary<TKey,TValue> 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.
- cancellationToken
- CancellationToken
A CancellationToken to observe while waiting for the task to complete.
Returns
A task that represents the asynchronous operation.
The task result contains a Dictionary<TKey,TValue> that contains values of type
TElement selected from the input sequence.
- Attributes
Remarks
Multiple active operations on the same context instance are not supported. Use 'await' to ensure that any asynchronous operations have completed before calling another method on this context.
Applies to
ToDictionaryAsync<TSource,TKey,TElement>(IQueryable<TSource>, Func<TSource,TKey>, Func<TSource,TElement>, IEqualityComparer<TKey>, CancellationToken)
Creates a Dictionary<TKey,TValue> from an IQueryable<T> by enumerating it asynchronously according to a specified key selector function, a comparer, and an element selector function.
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
public static System.Threading.Tasks.Task<System.Collections.Generic.Dictionary<TKey,TElement>> ToDictionaryAsync<TSource,TKey,TElement> (this System.Linq.IQueryable<TSource> source, Func<TSource,TKey> keySelector, Func<TSource,TElement> elementSelector, System.Collections.Generic.IEqualityComparer<TKey> comparer, System.Threading.CancellationToken cancellationToken);static member ToDictionaryAsync : System.Linq.IQueryable<'Source> * Func<'Source, 'Key> * Func<'Source, 'Element> * System.Collections.Generic.IEqualityComparer<'Key> * System.Threading.CancellationToken -> System.Threading.Tasks.Task<System.Collections.Generic.Dictionary<'Key, 'Element>>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.
Parameters
- source
- IQueryable<TSource>
An IQueryable<T> to create a Dictionary<TKey,TValue> 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.
- cancellationToken
- CancellationToken
A CancellationToken to observe while waiting for the task to complete.
Returns
A task that represents the asynchronous operation.
The task result contains a Dictionary<TKey,TValue> that contains values of type
TElement selected from the input sequence.
- Attributes
Remarks
Multiple active operations on the same context instance are not supported. Use 'await' to ensure that any asynchronous operations have completed before calling another method on this context.
Applies to
ToDictionaryAsync<TSource,TKey>(IQueryable<TSource>, Func<TSource,TKey>)
Creates a Dictionary<TKey,TValue> from an IQueryable<T> by enumerating it asynchronously according to a specified key selector function.
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
public static System.Threading.Tasks.Task<System.Collections.Generic.Dictionary<TKey,TSource>> ToDictionaryAsync<TSource,TKey> (this System.Linq.IQueryable<TSource> source, Func<TSource,TKey> keySelector);static member ToDictionaryAsync : System.Linq.IQueryable<'Source> * Func<'Source, 'Key> -> System.Threading.Tasks.Task<System.Collections.Generic.Dictionary<'Key, 'Source>><Extension()>
Public Function ToDictionaryAsync(Of TSource, TKey) (source As IQueryable(Of TSource), keySelector As Func(Of TSource, TKey)) As Task(Of Dictionary(Of TKey, TSource))Type Parameters
- TSource
The type of the elements of source.
- TKey
The type of the key returned by keySelector .
Parameters
- source
- IQueryable<TSource>
An IQueryable<T> to create a Dictionary<TKey,TValue> from.
- keySelector
- Func<TSource,TKey>
A function to extract a key from each element.
Returns
A task that represents the asynchronous operation. The task result contains a Dictionary<TKey,TValue> that contains selected keys and values.
- Attributes
Remarks
Multiple active operations on the same context instance are not supported. Use 'await' to ensure that any asynchronous operations have completed before calling another method on this context.
Applies to
ToDictionaryAsync<TSource,TKey>(IQueryable<TSource>, Func<TSource,TKey>, IEqualityComparer<TKey>)
Creates a Dictionary<TKey,TValue> from an IQueryable<T> by enumerating it asynchronously according to a specified key selector function and a comparer.
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
public static System.Threading.Tasks.Task<System.Collections.Generic.Dictionary<TKey,TSource>> ToDictionaryAsync<TSource,TKey> (this System.Linq.IQueryable<TSource> source, Func<TSource,TKey> keySelector, System.Collections.Generic.IEqualityComparer<TKey> comparer);static member ToDictionaryAsync : System.Linq.IQueryable<'Source> * Func<'Source, 'Key> * System.Collections.Generic.IEqualityComparer<'Key> -> System.Threading.Tasks.Task<System.Collections.Generic.Dictionary<'Key, 'Source>><Extension()>
Public Function ToDictionaryAsync(Of TSource, TKey) (source As IQueryable(Of TSource), keySelector As Func(Of TSource, TKey), comparer As IEqualityComparer(Of TKey)) As Task(Of Dictionary(Of TKey, TSource))Type Parameters
- TSource
The type of the elements of source.
- TKey
The type of the key returned by keySelector .
Parameters
- source
- IQueryable<TSource>
An IQueryable<T> to create a Dictionary<TKey,TValue> from.
- keySelector
- Func<TSource,TKey>
A function to extract a key from each element.
- comparer
- IEqualityComparer<TKey>
An IEqualityComparer<T> to compare keys.
Returns
A task that represents the asynchronous operation. The task result contains a Dictionary<TKey,TValue> that contains selected keys and values.
- Attributes
Remarks
Multiple active operations on the same context instance are not supported. Use 'await' to ensure that any asynchronous operations have completed before calling another method on this context.
Applies to
ToDictionaryAsync<TSource,TKey>(IQueryable<TSource>, Func<TSource,TKey>, CancellationToken)
Creates a Dictionary<TKey,TValue> from an IQueryable<T> by enumerating it asynchronously according to a specified key selector function.
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
public static System.Threading.Tasks.Task<System.Collections.Generic.Dictionary<TKey,TSource>> ToDictionaryAsync<TSource,TKey> (this System.Linq.IQueryable<TSource> source, Func<TSource,TKey> keySelector, System.Threading.CancellationToken cancellationToken);static member ToDictionaryAsync : System.Linq.IQueryable<'Source> * Func<'Source, 'Key> * System.Threading.CancellationToken -> System.Threading.Tasks.Task<System.Collections.Generic.Dictionary<'Key, 'Source>>Type Parameters
- TSource
The type of the elements of source.
- TKey
The type of the key returned by keySelector .
Parameters
- source
- IQueryable<TSource>
An IQueryable<T> to create a Dictionary<TKey,TValue> from.
- keySelector
- Func<TSource,TKey>
A function to extract a key from each element.
- cancellationToken
- CancellationToken
A CancellationToken to observe while waiting for the task to complete.
Returns
A task that represents the asynchronous operation. The task result contains a Dictionary<TKey,TValue> that contains selected keys and values.
- Attributes
Remarks
Multiple active operations on the same context instance are not supported. Use 'await' to ensure that any asynchronous operations have completed before calling another method on this context.
Applies to
ToDictionaryAsync<TSource,TKey>(IQueryable<TSource>, Func<TSource,TKey>, IEqualityComparer<TKey>, CancellationToken)
Creates a Dictionary<TKey,TValue> from an IQueryable<T> by enumerating it asynchronously according to a specified key selector function and a comparer.
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
public static System.Threading.Tasks.Task<System.Collections.Generic.Dictionary<TKey,TSource>> ToDictionaryAsync<TSource,TKey> (this System.Linq.IQueryable<TSource> source, Func<TSource,TKey> keySelector, System.Collections.Generic.IEqualityComparer<TKey> comparer, System.Threading.CancellationToken cancellationToken);static member ToDictionaryAsync : System.Linq.IQueryable<'Source> * Func<'Source, 'Key> * System.Collections.Generic.IEqualityComparer<'Key> * System.Threading.CancellationToken -> System.Threading.Tasks.Task<System.Collections.Generic.Dictionary<'Key, 'Source>>Type Parameters
- TSource
The type of the elements of source.
- TKey
The type of the key returned by keySelector .
Parameters
- source
- IQueryable<TSource>
An IQueryable<T> to create a Dictionary<TKey,TValue> from.
- keySelector
- Func<TSource,TKey>
A function to extract a key from each element.
- comparer
- IEqualityComparer<TKey>
An IEqualityComparer<T> to compare keys.
- cancellationToken
- CancellationToken
A CancellationToken to observe while waiting for the task to complete.
Returns
A task that represents the asynchronous operation. The task result contains a Dictionary<TKey,TValue> that contains selected keys and values.
- Attributes
Remarks
Multiple active operations on the same context instance are not supported. Use 'await' to ensure that any asynchronous operations have completed before calling another method on this context.
Applies to
Entity Framework