ReadOnlyDictionary<TKey,TValue>.KeyCollection 类

定义

表示 ReadOnlyDictionary<TKey,TValue> 对象的键的只读集合。Represents a read-only collection of the keys of a ReadOnlyDictionary<TKey,TValue> object.

public: ref class ReadOnlyDictionary<TKey, TValue>::KeyCollection sealed : System::Collections::Generic::ICollection<TKey>, System::Collections::Generic::IEnumerable<TKey>, System::Collections::Generic::IReadOnlyCollection<TKey>, System::Collections::ICollection
[System.Serializable]
public sealed class ReadOnlyDictionary<TKey,TValue>.KeyCollection : System.Collections.Generic.ICollection<TKey>, System.Collections.Generic.IEnumerable<TKey>, System.Collections.Generic.IReadOnlyCollection<TKey>, System.Collections.ICollection
type ReadOnlyDictionary<'Key, 'Value>.KeyCollection = class
    interface ICollection<'Key>
    interface ICollection
    interface IReadOnlyCollection<'Key>
    interface seq<'Key>
    interface IEnumerable
Public NotInheritable Class ReadOnlyDictionary(Of TKey, TValue).KeyCollection
Implements ICollection, ICollection(Of TKey), IEnumerable(Of TKey), IReadOnlyCollection(Of TKey)

类型参数

TKey
TValue
继承
ReadOnlyDictionary<TKey,TValue>.KeyCollection
属性
实现

属性

Count

获取集合中的元素数。Gets the number of elements in the collection.

方法

CopyTo(TKey[], Int32)

从特定的数组索引开始,将集合的元素复制到一个数组中。Copies the elements of the collection to an array, starting at a specific array index.

Equals(Object)

确定指定的对象是否等于当前对象。Determines whether the specified object is equal to the current object.

(继承自 Object)
GetEnumerator()

返回一个循环访问集合的枚举器。Returns an enumerator that iterates through the collection.

GetHashCode()

用作默认哈希函数。Serves as the default hash function.

(继承自 Object)
GetType()

获取当前实例的 TypeGets the Type of the current instance.

(继承自 Object)
MemberwiseClone()

创建当前 Object 的浅表副本。Creates a shallow copy of the current Object.

(继承自 Object)
ToString()

返回一个表示当前对象的 string。Returns a string that represents the current object.

(继承自 Object)

显式界面实现

ICollection.CopyTo(Array, Int32)

从特定的数组索引开始,将集合的元素复制到一个数组中。Copies the elements of the collection to an array, starting at a specific array index.

ICollection.IsSynchronized

获取一个值,该值指示对集合的访问是否同步(线程安全)。Gets a value that indicates whether access to the collection is synchronized (thread safe).

ICollection.SyncRoot

获取可用于同步对集合的访问的对象。Gets an object that can be used to synchronize access to the collection.

ICollection<TKey>.Add(TKey)

任何情况下均引发 NotSupportedException 异常。Throws a NotSupportedException exception in all cases.

ICollection<TKey>.Clear()

任何情况下均引发 NotSupportedException 异常。Throws a NotSupportedException exception in all cases.

ICollection<TKey>.Contains(TKey)

确定集合中是否包含特定值。Determines whether the collection contains a specific value.

ICollection<TKey>.IsReadOnly

获取一个值,该值指示字典是否为只读。Gets a value that indicates whether the dictionary is read-only.

ICollection<TKey>.Remove(TKey)

任何情况下均引发 NotSupportedException 异常。Throws a NotSupportedException exception in all cases.

IEnumerable.GetEnumerator()

返回一个循环访问集合的枚举器。Returns an enumerator that iterates through the collection.

扩展方法

CopyToDataTable<T>(IEnumerable<T>)

在给定其泛型参数 TDataTable 的输入 DataRow 对象的情况下,返回包含 IEnumerable<T> 对象副本的 DataRowReturns a DataTable that contains copies of the DataRow objects, given an input IEnumerable<T> object where the generic parameter T is DataRow.

CopyToDataTable<T>(IEnumerable<T>, DataTable, LoadOption)

在给定其泛型参数 TDataRow 的输入 DataTable 对象的情况下,将 IEnumerable<T> 对象复制到指定的 DataRowCopies DataRow objects to the specified DataTable, given an input IEnumerable<T> object where the generic parameter T is DataRow.

CopyToDataTable<T>(IEnumerable<T>, DataTable, LoadOption, FillErrorEventHandler)

在给定其泛型参数 TDataRow 的输入 DataTable 对象的情况下,将 IEnumerable<T> 对象复制到指定的 DataRowCopies DataRow objects to the specified DataTable, given an input IEnumerable<T> object where the generic parameter T is DataRow.

Cast<TResult>(IEnumerable)

IEnumerable 的元素强制转换为指定的类型。Casts the elements of an IEnumerable to the specified type.

OfType<TResult>(IEnumerable)

根据指定类型筛选 IEnumerable 的元素。Filters the elements of an IEnumerable based on a specified type.

AsParallel(IEnumerable)

启用查询的并行化。Enables parallelization of a query.

AsQueryable(IEnumerable)

IEnumerable 转换为 IQueryableConverts an IEnumerable to an IQueryable.

Ancestors<T>(IEnumerable<T>)

返回元素集合,其中包含源集合中每个节点的上级。Returns a collection of elements that contains the ancestors of every node in the source collection.

Ancestors<T>(IEnumerable<T>, XName)

返回经过筛选的元素集合,其中包含源集合中每个节点的上级。Returns a filtered collection of elements that contains the ancestors of every node in the source collection. 集合中仅包括具有匹配 XName 的元素。Only elements that have a matching XName are included in the collection.

DescendantNodes<T>(IEnumerable<T>)

返回源集合中每个文档和元素的子代节点的集合。Returns a collection of the descendant nodes of every document and element in the source collection.

Descendants<T>(IEnumerable<T>)

返回元素集合,其中包含源集合中每个元素和文档的子代元素。Returns a collection of elements that contains the descendant elements of every element and document in the source collection.

Descendants<T>(IEnumerable<T>, XName)

返回经过筛选的元素集合,其中包含源集合中每个元素和文档的子代元素。Returns a filtered collection of elements that contains the descendant elements of every element and document in the source collection. 集合中仅包括具有匹配 XName 的元素。Only elements that have a matching XName are included in the collection.

Elements<T>(IEnumerable<T>)

返回源集合中每个元素和文档的子元素的集合。Returns a collection of the child elements of every element and document in the source collection.

Elements<T>(IEnumerable<T>, XName)

返回源集合中经过筛选的每个元素和文档的子元素集合。Returns a filtered collection of the child elements of every element and document in the source collection. 集合中仅包括具有匹配 XName 的元素。Only elements that have a matching XName are included in the collection.

InDocumentOrder<T>(IEnumerable<T>)

返回节点集合(其中包含源集合中的所有节点),并按文档顺序排列。Returns a collection of nodes that contains all nodes in the source collection, sorted in document order.

Nodes<T>(IEnumerable<T>)

返回源集合中每个文档和元素的子节点集合。Returns a collection of the child nodes of every document and element in the source collection.

Remove<T>(IEnumerable<T>)

将源集合中的每个节点从其父节点中移除。Removes every node in the source collection from its parent node.

适用于