Queryable.DistinctBy 方法
定義
重要
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多載
| 名稱 | Description |
|---|---|
| DistinctBy<TSource,TKey>(IQueryable<TSource>, Expression<Func<TSource,TKey>>) |
根據指定的索引鍵選取器函式，從序列傳回不同的專案。 |
| DistinctBy<TSource,TKey>(IQueryable<TSource>, Expression<Func<TSource,TKey>>, IEqualityComparer<TKey>) |
根據指定的索引鍵選取器函式，從序列傳回不同的專案。 |
DistinctBy<TSource,TKey>(IQueryable<TSource>, Expression<Func<TSource,TKey>>)
- 來源:
- Queryable.cs
- 來源:
- Queryable.cs
- 來源:
- Queryable.cs
- 來源:
- Queryable.cs
- 來源:
- Queryable.cs
根據指定的索引鍵選取器函式，從序列傳回不同的專案。
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);[System.Diagnostics.CodeAnalysis.RequiresDynamicCode("Enumerating collections as IQueryable can require creating new generic types or methods, which requires creating code at runtime. This may not work when AOT compiling.")]
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>[<System.Diagnostics.CodeAnalysis.RequiresDynamicCode("Enumerating collections as IQueryable can require creating new generic types or methods, which requires creating code at runtime. This may not work when AOT compiling.")>]
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)類型參數
- TSource
元素 source的類型。
- TKey
區分元素的鑰匙類型。
參數
- source
- IQueryable<TSource>
移除重複元素的序列。
- keySelector
- Expression<Func<TSource,TKey>>
一個用來提取每個元素鍵值的函式。
傳回
IQueryable<TSource>
包含 IQueryable<T> 源序列中不同元素的 。
- 屬性
例外狀況
source 是 null。
適用於
DistinctBy<TSource,TKey>(IQueryable<TSource>, Expression<Func<TSource,TKey>>, IEqualityComparer<TKey>)
- 來源:
- Queryable.cs
- 來源:
- Queryable.cs
- 來源:
- Queryable.cs
- 來源:
- Queryable.cs
- 來源:
- Queryable.cs
根據指定的索引鍵選取器函式，從序列傳回不同的專案。
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);[System.Diagnostics.CodeAnalysis.RequiresDynamicCode("Enumerating collections as IQueryable can require creating new generic types or methods, which requires creating code at runtime. This may not work when AOT compiling.")]
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>[<System.Diagnostics.CodeAnalysis.RequiresDynamicCode("Enumerating collections as IQueryable can require creating new generic types or methods, which requires creating code at runtime. This may not work when AOT compiling.")>]
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)類型參數
- TSource
元素 source的類型。
- TKey
區分元素的鑰匙類型。
參數
- source
- IQueryable<TSource>
移除重複元素的序列。
- keySelector
- Expression<Func<TSource,TKey>>
一個用來提取每個元素鍵值的函式。
- comparer
- IEqualityComparer<TKey>
還有 IEqualityComparer<T> 比較鑰匙。
傳回
IQueryable<TSource>
包含 IQueryable<T> 源序列中不同元素的 。
- 屬性
例外狀況
source 是 null。
