Queryable.DistinctBy Method
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
| DistinctBy<TSource,TKey>(IQueryable<TSource>, Expression<Func<TSource,TKey>>) |
Returns distinct elements from a sequence according to a specified key selector function. |
| DistinctBy<TSource,TKey>(IQueryable<TSource>, Expression<Func<TSource,TKey>>, IEqualityComparer<TKey>) |
Returns distinct elements from a sequence according to a specified key selector function. |
- Source:
- Queryable.cs
- Source:
- Queryable.cs
- Source:
- Queryable.cs
Returns distinct elements from a sequence according to a specified key selector function.
public:
generic <typename TSource, typename TKey>
[System::Runtime::CompilerServices::Extension]
static System::Linq::IQueryable<TSource> ^ DistinctBy(System::Linq::IQueryable<TSource> ^ source, System::Linq::Expressions::Expression<Func<TSource, TKey> ^> ^ keySelector);public static System.Linq.IQueryable<TSource> DistinctBy<TSource,TKey>(this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<Func<TSource,TKey>> keySelector);static member DistinctBy : System.Linq.IQueryable<'Source> * System.Linq.Expressions.Expression<Func<'Source, 'Key>> -> System.Linq.IQueryable<'Source><Extension()>
Public Function DistinctBy(Of TSource, TKey) (source As IQueryable(Of TSource), keySelector As Expression(Of Func(Of TSource, TKey))) As IQueryable(Of TSource)Type Parameters
- TSource
The type of the elements of source.
- TKey
The type of key to distinguish elements by.
Parameters
- source
- IQueryable<TSource>
The sequence to remove duplicate elements from.
- keySelector
- Expression<Func<TSource,TKey>>
A function to extract the key for each element.
Returns
An IQueryable<T> that contains distinct elements from the source sequence.
Exceptions
source is null.
Applies to
.NET 9 and other versions
| Product | Versions |
|---|---|
| .NET | 6, 7, 8, 9 |
DistinctBy<TSource,TKey>(IQueryable<TSource>, Expression<Func<TSource,TKey>>, IEqualityComparer<TKey>)
- Source:
- Queryable.cs
- Source:
- Queryable.cs
- Source:
- Queryable.cs
Returns distinct elements from a sequence according to a specified key selector function.
public:
generic <typename TSource, typename TKey>
[System::Runtime::CompilerServices::Extension]
static System::Linq::IQueryable<TSource> ^ DistinctBy(System::Linq::IQueryable<TSource> ^ source, System::Linq::Expressions::Expression<Func<TSource, TKey> ^> ^ keySelector, System::Collections::Generic::IEqualityComparer<TKey> ^ comparer);public static System.Linq.IQueryable<TSource> DistinctBy<TSource,TKey>(this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<Func<TSource,TKey>> keySelector, System.Collections.Generic.IEqualityComparer<TKey>? comparer);static member DistinctBy : System.Linq.IQueryable<'Source> * System.Linq.Expressions.Expression<Func<'Source, 'Key>> * System.Collections.Generic.IEqualityComparer<'Key> -> System.Linq.IQueryable<'Source><Extension()>
Public Function DistinctBy(Of TSource, TKey) (source As IQueryable(Of TSource), keySelector As Expression(Of Func(Of TSource, TKey)), comparer As IEqualityComparer(Of TKey)) As IQueryable(Of TSource)Type Parameters
- TSource
The type of the elements of source.
- TKey
The type of key to distinguish elements by.
Parameters
- source
- IQueryable<TSource>
The sequence to remove duplicate elements from.
- keySelector
- Expression<Func<TSource,TKey>>
A function to extract the key for each element.
- comparer
- IEqualityComparer<TKey>
An IEqualityComparer<T> to compare keys.
Returns
An IQueryable<T> that contains distinct elements from the source sequence.
Exceptions
source is null.
Applies to
.NET 9 and other versions
| Product | Versions |
|---|---|
| .NET | 6, 7, 8, 9 |
.NET feedback
.NET is an open source project. Select a link to provide feedback: