System.Linq 命名空间

提供一组用于查询实现 IEnumerable<T> 的对象的 static（在 Visual Basic 中为 Shared）方法。Provides a set of static (Shared in Visual Basic) methods for querying objects that implement IEnumerable<T>.

表示一个表达式树，并提供在重写之后执行表达式树的功能。Represents an expression tree and provides functionality to execute the expression tree after rewriting it.

表示一个表达式树，并提供在重写之后执行表达式树的功能。Represents an expression tree and provides functionality to execute the expression tree after rewriting it.

将 IEnumerable 表示为 EnumerableQuery 数据源。Represents an IEnumerable as an EnumerableQuery data source.

表示作为 IQueryable<T> 数据源的 IEnumerable<T> 集合。Represents an IEnumerable<T> collection as an IQueryable<T> data source.

LINQ 扩展方法重写，它们为 ImmutableArray<T> 提供的效率高于标准 LINQ 方法。LINQ extension method overrides that offer greater efficiency for ImmutableArray<T> than the standard LINQ methods NuGet package: System.Collections.Immutable（关于不可变集合和安装方法）NuGet package: System.Collections.Immutable (about immutable collections and how to install)

表示键的集合，其中每个键映射到一个或多个值。Represents a collection of keys each mapped to one or more values.

表示已排序的并行序列。Represents a sorted, parallel sequence.

提供一组用于查询实现 ParallelQuery{TSource} 的对象的方法。Provides a set of methods for querying objects that implement ParallelQuery{TSource}. 这是 Enumerable 的并行等效项。This is the parallel equivalent of Enumerable.

表示并行序列。Represents a parallel sequence.

表示并行序列。Represents a parallel sequence.

提供一组用于查询实现 IQueryable<T> 的数据结构的 static（在 Visual Basic 中为 Shared）方法。Provides a set of static (Shared in Visual Basic) methods for querying data structures that implement IQueryable<T>.

表示具有公共键的对象的集合。Represents a collection of objects that have a common key.

定义索引器、大小属性以及将键映射到 IEnumerable<T> 值序列的数据结构的布尔搜索方法。Defines an indexer, size property, and Boolean search method for data structures that map keys to IEnumerable<T> sequences of values.

表示一个排序的序列。Represents a sorted sequence.

表示排序操作的结果。Represents the result of a sorting operation.

表示排序操作的结果。Represents the result of a sorting operation.

提供针对特定数据源（其中数据类型未指定）评估查询的功能。Provides functionality to evaluate queries against a specific data source wherein the type of the data is not specified.

提供针对特定数据源（其中数据类型未未知）评估查询的功能。Provides functionality to evaluate queries against a specific data source wherein the type of the data is known.

定义用于创建和执行 IQueryable 对象所描述的查询的方法。Defines methods to create and execute queries that are described by an IQueryable object.

查询执行模式是一个提示，指定在对查询进行并行化时系统应如何处理性能权衡。The query execution mode is a hint that specifies how the system should handle performance trade-offs when parallelizing queries.

指定要在查询中使用的首选 输出合并 类型。Specifies the preferred type of output merge to use in a query. 换而言之，它指示 PLINQ 应如何将来自各个分区的结果合并回单个结果序列。In other words, it indicates how PLINQ should merge the results from the various partitions back into a single result sequence. 这只是一个提示，并且在对所有查询进行并行化时系统可能不会遵循此提示。This is a hint only, and may not be respected by the system when parallelizing all queries.