ReadOnlyDictionary<TKey,TValue> 类

定义

表示键/值对的只读泛型集合。Represents a read-only, generic collection of key/value pairs.

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

类型参数

TKey

字典中键的类型。The type of keys in the dictionary.

TValue

字典中值的类型。The type of values in the dictionary.

继承
ReadOnlyDictionary<TKey,TValue>
属性
实现

构造函数

ReadOnlyDictionary<TKey,TValue>(IDictionary<TKey,TValue>)

初始化 ReadOnlyDictionary<TKey,TValue> 类的新实例,该实例是指定字典周围的包装。Initializes a new instance of the ReadOnlyDictionary<TKey,TValue> class that is a wrapper around the specified dictionary.

属性

Count

获取字典中项的数目。Gets the number of items in the dictionary.

Dictionary

获取由 ReadOnlyDictionary<TKey,TValue> 对象包装的字典。Gets the dictionary that is wrapped by this ReadOnlyDictionary<TKey,TValue> object.

Item[TKey]

获取具有指定键的元素。Gets the element that has the specified key.

Keys

获取包含字典中的键的键集合。Gets a key collection that contains the keys of the dictionary.

Values

获取包含词典中的值的集合。Gets a collection that contains the values in the dictionary.

方法

ContainsKey(TKey)

确定字典是否包含具有指定键的元素。Determines whether the dictionary contains an element that has the specified key.

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()

返回循环访问 ReadOnlyDictionary<TKey,TValue> 的枚举数。Returns an enumerator that iterates through the ReadOnlyDictionary<TKey,TValue>.

GetHashCode()

作为默认哈希函数。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()

返回表示当前对象的字符串。Returns a string that represents the current object.

(继承自 Object)
TryGetValue(TKey, TValue)

检索与指定键关联的值。Retrieves the value that is associated with the specified key.

显式界面实现

ICollection.CopyTo(Array, Int32)

从指定的数组索引开始,将字典中的元素复制到一个数组中。Copies the elements of the dictionary to an array, starting at the specified array index.

ICollection.IsSynchronized

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

ICollection.SyncRoot

获取可用于同步对字典的访问的对象。Gets an object that can be used to synchronize access to the dictionary.

ICollection<KeyValuePair<TKey,TValue>>.Add(KeyValuePair<TKey,TValue>)

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

ICollection<KeyValuePair<TKey,TValue>>.Clear()

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

ICollection<KeyValuePair<TKey,TValue>>.Contains(KeyValuePair<TKey,TValue>)

确定字典是否包含特定值。Determines whether the dictionary contains a specific value.

ICollection<KeyValuePair<TKey,TValue>>.CopyTo(KeyValuePair<TKey,TValue>[], Int32)

从指定的数组索引开始,将字典中的元素复制到一个数组中。Copies the elements of the dictionary to an array, starting at the specified array index.

ICollection<KeyValuePair<TKey,TValue>>.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<KeyValuePair<TKey,TValue>>.Remove(KeyValuePair<TKey,TValue>)

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

IDictionary.Add(Object, Object)

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

IDictionary.Clear()

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

IDictionary.Contains(Object)

确定字典是否包含具有指定键的元素。Determines whether the dictionary contains an element that has the specified key.

IDictionary.GetEnumerator()

返回字典的一个枚举数。Returns an enumerator for the dictionary.

IDictionary.IsFixedSize

获取一个值,该值指示字典是否具有固定大小。Gets a value that indicates whether the dictionary has a fixed size.

IDictionary.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.

IDictionary.Item[Object]

获取具有指定键的元素。Gets the element that has the specified key.

IDictionary.Keys

获取包含词典中的键的集合。Gets a collection that contains the keys of the dictionary.

IDictionary.Remove(Object)

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

IDictionary.Values

获取包含词典中的值的集合。Gets a collection that contains the values in the dictionary.

IDictionary<TKey,TValue>.Add(TKey, TValue)

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

IDictionary<TKey,TValue>.Item[TKey]

获取具有指定键的元素。Gets the element that has the specified key.

IDictionary<TKey,TValue>.Keys

获取包含词典中的键的集合。Gets a collection that contains the keys of the dictionary.

IDictionary<TKey,TValue>.Remove(TKey)

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

IDictionary<TKey,TValue>.Values

获取包含词典中的值的集合。Gets a collection that contains the values in the dictionary.

IEnumerable.GetEnumerator()

返回循环访问集合的枚举数。Returns an enumerator that iterates through a collection.

IReadOnlyDictionary<TKey,TValue>.Keys

获取包含只读字典中的密钥的可枚举集合。Gets an enumerable collection that contains the keys in the read-only dictionary.

IReadOnlyDictionary<TKey,TValue>.Values

获取包含只读字典中的值的可枚举集合。Gets an enumerable collection that contains the values in the read-only dictionary.

扩展方法

GetValueOrDefault<TKey,TValue>(IReadOnlyDictionary<TKey,TValue>, TKey)
GetValueOrDefault<TKey,TValue>(IReadOnlyDictionary<TKey,TValue>, TKey, TValue)
Remove<TKey,TValue>(IDictionary<TKey,TValue>, TKey, TValue)
TryAdd<TKey,TValue>(IDictionary<TKey,TValue>, TKey, TValue)
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