Queryable.UnionBy 方法
定义
重要
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重载
UnionBy<TSource,TKey>(IQueryable<TSource>, IEnumerable<TSource>, Expression<Func<TSource,TKey>>)
- Source:
- Queryable.cs
- Source:
- Queryable.cs
- Source:
- Queryable.cs
- Source:
- Queryable.cs
- Source:
- Queryable.cs
根据指定的键选择器函数生成两个序列的集并集。
public:
generic <typename TSource, typename TKey>
[System::Runtime::CompilerServices::Extension]
static System::Linq::IQueryable<TSource> ^ UnionBy(System::Linq::IQueryable<TSource> ^ source1, System::Collections::Generic::IEnumerable<TSource> ^ source2, System::Linq::Expressions::Expression<Func<TSource, TKey> ^> ^ keySelector);public static System.Linq.IQueryable<TSource> UnionBy<TSource,TKey>(this System.Linq.IQueryable<TSource> source1, System.Collections.Generic.IEnumerable<TSource> source2, 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> UnionBy<TSource,TKey>(this System.Linq.IQueryable<TSource> source1, System.Collections.Generic.IEnumerable<TSource> source2, System.Linq.Expressions.Expression<Func<TSource,TKey>> keySelector);static member UnionBy : System.Linq.IQueryable<'Source> * seq<'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 UnionBy : System.Linq.IQueryable<'Source> * seq<'Source> * System.Linq.Expressions.Expression<Func<'Source, 'Key>> -> System.Linq.IQueryable<'Source><Extension()>
Public Function UnionBy(Of TSource, TKey) (source1 As IQueryable(Of TSource), source2 As IEnumerable(Of TSource), keySelector As Expression(Of Func(Of TSource, TKey))) As IQueryable(Of TSource)类型参数
- TSource
输入序列的元素的类型。
- TKey
要标识元素的键的类型。
参数
- source1
- IQueryable<TSource>
IQueryable<T>其不同元素构成联合的第一个集。
- source2
- IEnumerable<TSource>
IEnumerable<T>其不同元素构成联合的第二组。
- keySelector
- Expression<Func<TSource,TKey>>
用于提取每个元素的键的函数。
返回
IQueryable<TSource>
一个 IEnumerable<T> 包含两个输入序列中的元素，不包括重复项。
- 属性
例外
source1 或 source2 为 null.
适用于
UnionBy<TSource,TKey>(IQueryable<TSource>, IEnumerable<TSource>, Expression<Func<TSource,TKey>>, IEqualityComparer<TKey>)
- Source:
- Queryable.cs
- Source:
- Queryable.cs
- Source:
- Queryable.cs
- Source:
- Queryable.cs
- Source:
- Queryable.cs
根据指定的键选择器函数生成两个序列的集并集。
public:
generic <typename TSource, typename TKey>
[System::Runtime::CompilerServices::Extension]
static System::Linq::IQueryable<TSource> ^ UnionBy(System::Linq::IQueryable<TSource> ^ source1, System::Collections::Generic::IEnumerable<TSource> ^ source2, System::Linq::Expressions::Expression<Func<TSource, TKey> ^> ^ keySelector, System::Collections::Generic::IEqualityComparer<TKey> ^ comparer);public static System.Linq.IQueryable<TSource> UnionBy<TSource,TKey>(this System.Linq.IQueryable<TSource> source1, System.Collections.Generic.IEnumerable<TSource> source2, 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> UnionBy<TSource,TKey>(this System.Linq.IQueryable<TSource> source1, System.Collections.Generic.IEnumerable<TSource> source2, System.Linq.Expressions.Expression<Func<TSource,TKey>> keySelector, System.Collections.Generic.IEqualityComparer<TKey>? comparer);static member UnionBy : System.Linq.IQueryable<'Source> * seq<'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 UnionBy : System.Linq.IQueryable<'Source> * seq<'Source> * System.Linq.Expressions.Expression<Func<'Source, 'Key>> * System.Collections.Generic.IEqualityComparer<'Key> -> System.Linq.IQueryable<'Source><Extension()>
Public Function UnionBy(Of TSource, TKey) (source1 As IQueryable(Of TSource), source2 As IEnumerable(Of TSource), keySelector As Expression(Of Func(Of TSource, TKey)), comparer As IEqualityComparer(Of TKey)) As IQueryable(Of TSource)类型参数
- TSource
输入序列的元素的类型。
- TKey
要标识元素的键的类型。
参数
- source1
- IQueryable<TSource>
IQueryable<T>其不同元素构成联合的第一个集。
- source2
- IEnumerable<TSource>
IEnumerable<T>其不同元素构成联合的第二组。
- keySelector
- Expression<Func<TSource,TKey>>
用于提取每个元素的键的函数。
- comparer
- IEqualityComparer<TKey>
要 IEqualityComparer<T> 比较的值。
返回
IQueryable<TSource>
一个 IEnumerable<T> 包含两个输入序列中的元素，不包括重复项。
- 属性
例外
source1 或 source2 为 null.
