OrderedDictionary 类

定义

命名空间:
System.Collections.Specialized
程序集:
System.dll, System.Collections.Specialized.dll
程序集:
System.dll
程序集:
netstandard.dll

表示键或索引可访问的键/值对的集合。

public ref class OrderedDictionary : System::Collections::IDictionary, System::Collections::Specialized::IOrderedDictionary
public ref class OrderedDictionary : System::Collections::IDictionary, System::Collections::Specialized::IOrderedDictionary, System::Runtime::Serialization::IDeserializationCallback, System::Runtime::Serialization::ISerializable
public ref class OrderedDictionary : System::Collections::Specialized::IOrderedDictionary, System::Runtime::Serialization::IDeserializationCallback, System::Runtime::Serialization::ISerializable
public class OrderedDictionary : System.Collections.IDictionary, System.Collections.Specialized.IOrderedDictionary
[System.Serializable]
public class OrderedDictionary : System.Collections.IDictionary, System.Collections.Specialized.IOrderedDictionary, System.Runtime.Serialization.IDeserializationCallback, System.Runtime.Serialization.ISerializable
public class OrderedDictionary : System.Collections.Specialized.IOrderedDictionary, System.Runtime.Serialization.IDeserializationCallback, System.Runtime.Serialization.ISerializable
type OrderedDictionary = class
    interface ICollection
    interface IEnumerable
    interface IDictionary
    interface IOrderedDictionary
[<System.Serializable>]
type OrderedDictionary = class
    interface IOrderedDictionary
    interface IDictionary
    interface ICollection
    interface IEnumerable
    interface ISerializable
    interface IDeserializationCallback
type OrderedDictionary = class
    interface ICollection
    interface IEnumerable
    interface IDictionary
    interface IOrderedDictionary
    interface IDeserializationCallback
    interface ISerializable
Public Class OrderedDictionary
Implements IDictionary, IOrderedDictionary
Public Class OrderedDictionary
Implements IDeserializationCallback, IDictionary, IOrderedDictionary, ISerializable
Public Class OrderedDictionary
Implements IDeserializationCallback, IOrderedDictionary, ISerializable
继承
Object
OrderedDictionary
派生
属性
SerializableAttribute
实现
ICollection IDictionary IEnumerable IOrderedDictionary IDeserializationCallback ISerializable

示例

下面的代码示例演示集合的 OrderedDictionary 创建、填充和修改，以及显示内容的两种方法 OrderedDictionary：一种使用 Keys 和 Values 属性，另一种通过 GetEnumerator 该方法创建枚举器。

// The following code example enumerates the elements of a OrderedDictionary.
using System;
using System.Collections;
using System.Collections.Specialized;

public class OrderedDictionarySample
{
    public static void Main()
    {

        // Creates and initializes a OrderedDictionary.
        OrderedDictionary myOrderedDictionary = new OrderedDictionary();
        myOrderedDictionary.Add("testKey1", "testValue1");
        myOrderedDictionary.Add("testKey2", "testValue2");
        myOrderedDictionary.Add("keyToDelete", "valueToDelete");
        myOrderedDictionary.Add("testKey3", "testValue3");

        ICollection keyCollection = myOrderedDictionary.Keys;
        ICollection valueCollection = myOrderedDictionary.Values;

        // Display the contents using the key and value collections
        DisplayContents(keyCollection, valueCollection, myOrderedDictionary.Count);

        // Modifying the OrderedDictionary
        if (!myOrderedDictionary.IsReadOnly)
        {
            // Insert a new key to the beginning of the OrderedDictionary
            myOrderedDictionary.Insert(0, "insertedKey1", "insertedValue1");

            // Modify the value of the entry with the key "testKey2"
            myOrderedDictionary["testKey2"] = "modifiedValue";

            // Remove the last entry from the OrderedDictionary: "testKey3"
            myOrderedDictionary.RemoveAt(myOrderedDictionary.Count - 1);

            // Remove the "keyToDelete" entry, if it exists
            if (myOrderedDictionary.Contains("keyToDelete"))
            {
                myOrderedDictionary.Remove("keyToDelete");
            }
        }

        Console.WriteLine(
            "{0}Displaying the entries of a modified OrderedDictionary.",
            Environment.NewLine);
        DisplayContents(keyCollection, valueCollection, myOrderedDictionary.Count);

        // Clear the OrderedDictionary and add new values
        myOrderedDictionary.Clear();
        myOrderedDictionary.Add("newKey1", "newValue1");
        myOrderedDictionary.Add("newKey2", "newValue2");
        myOrderedDictionary.Add("newKey3", "newValue3");

        // Display the contents of the "new" Dictionary using an enumerator
        IDictionaryEnumerator myEnumerator =
            myOrderedDictionary.GetEnumerator();

        Console.WriteLine(
            "{0}Displaying the entries of a \"new\" OrderedDictionary.",
            Environment.NewLine);

        DisplayEnumerator(myEnumerator);
    }

    // Displays the contents of the OrderedDictionary from its keys and values
    public static void DisplayContents(
        ICollection keyCollection, ICollection valueCollection, int dictionarySize)
    {
        String[] myKeys = new String[dictionarySize];
        String[] myValues = new String[dictionarySize];
        keyCollection.CopyTo(myKeys, 0);
        valueCollection.CopyTo(myValues, 0);

        // Displays the contents of the OrderedDictionary
        Console.WriteLine("   INDEX KEY                       VALUE");
        for (int i = 0; i < dictionarySize; i++)
        {
            Console.WriteLine("   {0,-5} {1,-25} {2}",
                i, myKeys[i], myValues[i]);
        }
        Console.WriteLine();
    }

    // Displays the contents of the OrderedDictionary using its enumerator
    public static void DisplayEnumerator(IDictionaryEnumerator myEnumerator)
    {
        Console.WriteLine("   KEY                       VALUE");
        while (myEnumerator.MoveNext())
        {
            Console.WriteLine("   {0,-25} {1}",
                myEnumerator.Key, myEnumerator.Value);
        }
    }
}

/*
This code produces the following output.

   INDEX KEY                       VALUE
   0     testKey1                  testValue1
   1     testKey2                  testValue2
   2     keyToDelete               valueToDelete
   3     testKey3                  testValue3


Displaying the entries of a modified OrderedDictionary.
   INDEX KEY                       VALUE
   0     insertedKey1              insertedValue1
   1     testKey1                  testValue1
   2     testKey2                  modifiedValue


Displaying the entries of a "new" OrderedDictionary.
   KEY                       VALUE
   newKey1                   newValue1
   newKey2                   newValue2
   newKey3                   newValue3

*/

' The following code example enumerates the elements of a OrderedDictionary.
Imports System.Collections
Imports System.Collections.Specialized

Public Class OrderedDictionarySample

    Public Shared Sub Main()

        ' Creates and initializes a OrderedDictionary.
        Dim myOrderedDictionary As New OrderedDictionary()
        myOrderedDictionary.Add("testKey1", "testValue1")
        myOrderedDictionary.Add("testKey2", "testValue2")
        myOrderedDictionary.Add("keyToDelete", "valueToDelete")
        myOrderedDictionary.Add("testKey3", "testValue3")

        Dim keyCollection As ICollection = myOrderedDictionary.Keys
        Dim valueCollection As ICollection = myOrderedDictionary.Values

        ' Display the contents Imports the key and value collections
        DisplayContents( _
            keyCollection, valueCollection, myOrderedDictionary.Count)

        ' Modifying the OrderedDictionary
        If Not myOrderedDictionary.IsReadOnly Then

            ' Insert a new key to the beginning of the OrderedDictionary
            myOrderedDictionary.Insert(0, "insertedKey1", "insertedValue1")

            ' Modify the value of the entry with the key "testKey2"
            myOrderedDictionary("testKey2") = "modifiedValue"

            ' Remove the last entry from the OrderedDictionary: "testKey3"
            myOrderedDictionary.RemoveAt(myOrderedDictionary.Count - 1)

            ' Remove the "keyToDelete" entry, if it exists
            If (myOrderedDictionary.Contains("keyToDelete")) Then
                myOrderedDictionary.Remove("keyToDelete")
            End If
        End If

        Console.WriteLine( _
            "{0}Displaying the entries of a modified OrderedDictionary.", _
            Environment.NewLine)
        DisplayContents( _
            keyCollection, valueCollection, myOrderedDictionary.Count)

        ' Clear the OrderedDictionary and add new values
        myOrderedDictionary.Clear()
        myOrderedDictionary.Add("newKey1", "newValue1")
        myOrderedDictionary.Add("newKey2", "newValue2")
        myOrderedDictionary.Add("newKey3", "newValue3")

        ' Display the contents of the "new" Dictionary Imports an enumerator
        Dim myEnumerator As IDictionaryEnumerator = _
            myOrderedDictionary.GetEnumerator()

        Console.WriteLine( _
            "{0}Displaying the entries of a 'new' OrderedDictionary.", _
            Environment.NewLine)

        DisplayEnumerator(myEnumerator)
    End Sub

    ' Displays the contents of the OrderedDictionary from its keys and values
    Public Shared Sub DisplayContents( _
        ByVal keyCollection As ICollection, _
        ByVal valueCollection As ICollection, ByVal dictionarySize As Integer)

        Dim myKeys(dictionarySize) As [String]
        Dim myValues(dictionarySize) As [String]
        keyCollection.CopyTo(myKeys, 0)
        valueCollection.CopyTo(myValues, 0)

        ' Displays the contents of the OrderedDictionary
        Console.WriteLine("   INDEX KEY                       VALUE")
        Dim i As Integer
        For i = 0 To dictionarySize - 1
            Console.WriteLine("   {0,-5} {1,-25} {2}", _
                 i, myKeys(i), myValues(i))
        Next i
        Console.WriteLine()
    End Sub

    ' Displays the contents of the OrderedDictionary using its enumerator
    Public Shared Sub DisplayEnumerator( _
        ByVal myEnumerator As IDictionaryEnumerator)

        Console.WriteLine("   KEY                       VALUE")
        While myEnumerator.MoveNext()
            Console.WriteLine("   {0,-25} {1}", _
                myEnumerator.Key, myEnumerator.Value)
        End While
    End Sub
End Class

'This code produces the following output.
'
'   INDEX KEY                       VALUE
'0:              testKey1(testValue1)
'1:              testKey2(testValue2)
'2:              keyToDelete(valueToDelete)
'3:              testKey3(testValue3)
'
'
'Displaying the entries of a modified OrderedDictionary.
'   INDEX KEY                       VALUE
'0:              insertedKey1(insertedValue1)
'1:              testKey1(testValue1)
'2:              testKey2(modifiedValue)
'
'
'Displaying the entries of a "new" OrderedDictionary.
'                KEY(VALUE)
'                newKey1(newValue1)
'                newKey2(newValue2)
'                newKey3(newValue3)

注解

每个元素都是存储在对象中的 DictionaryEntry 键/值对。 键不能 null，但值可以是。

与类的SortedDictionary<TKey,TValue>元素不同，元素OrderedDictionary不按键排序。 可以通过键或索引访问元素。

C# 语言的 foreach 语句 （For Each in Visual Basic） 返回集合中每个元素的类型的对象。 由于集合的每个元素 OrderedDictionary 都是键/值对，因此元素类型不是键的类型或值的类型。 相反，元素类型为 DictionaryEntry. 以下代码显示了语法。

foreach (DictionaryEntry de in myOrderedDictionary)
{
    //...
}

For Each de As DictionaryEntry In myOrderedDictionary
    '...
Next de

该 foreach 语句是枚举器周围的包装器，它只允许从集合（而不是写入到集合）进行读取。

构造函数

名称 说明
OrderedDictionary()

初始化 OrderedDictionary 类的新实例。
OrderedDictionary(IEqualityComparer)

使用指定的比较器初始化类的新实例 OrderedDictionary 。
OrderedDictionary(Int32, IEqualityComparer)

使用指定的初始容量和比较器初始化类的新实例 OrderedDictionary 。
OrderedDictionary(Int32)

使用指定的初始容量初始化类的新实例 OrderedDictionary 。
OrderedDictionary(SerializationInfo, StreamingContext)

初始化使用指定SerializationInfo对象StreamingContext可序列化的OrderedDictionary类的新实例。

属性

名称 说明
Count

获取集合中包含的 OrderedDictionary 键/值对的数目。
IsReadOnly

获取一个值，该值指示集合是否 OrderedDictionary 为只读。
Item[Int32]

获取或设置指定索引处的值。
Item[Object]

获取或设置具有指定键的值。
Keys

获取一个 ICollection 对象，该对象包含集合中的 OrderedDictionary 键。
Values

获取一个 ICollection 对象，该对象包含集合中的 OrderedDictionary 值。

方法

名称 说明
Add(Object, Object)

将具有指定键和值的条目添加到具有最低可用索引的 OrderedDictionary 集合中。
AsReadOnly()

返回当前 OrderedDictionary 集合的只读副本。
Clear()

从集合中删除所有元素 OrderedDictionary 。
Contains(Object)

确定集合是否 OrderedDictionary 包含特定键。
CopyTo(Array, Int32)

将 OrderedDictionary 元素复制到指定索引处的一维 Array 对象。
Equals(Object)

确定指定的对象是否等于当前对象。

(继承自 Object)
GetEnumerator()

返回循环 IDictionaryEnumerator 访问集合的对象 OrderedDictionary 。
GetHashCode()

用作默认哈希函数。

(继承自 Object)
GetObjectData(SerializationInfo, StreamingContext)

ISerializable实现接口并返回序列化OrderedDictionary集合所需的数据。
GetType()

获取当前实例的 Type。

(继承自 Object)
Insert(Int32, Object, Object)

在集合中插入具有指定键和值的新条目 OrderedDictionary （位于指定索引处）。
MemberwiseClone()

创建当前 Object的浅表副本。

(继承自 Object)
OnDeserialization(Object)

实现接口， ISerializable 并在反序列化完成后由反序列化事件调用。
Remove(Object)

从集合中删除具有指定键的 OrderedDictionary 项。
RemoveAt(Int32)

从集合中移除指定索引处的 OrderedDictionary 项。
ToString()

返回一个表示当前对象的字符串。

(继承自 Object)

显式接口实现

名称 说明
ICollection.IsSynchronized

获取一个值，该值指示是否同步对 OrderedDictionary 对象的访问（线程安全）。
ICollection.SyncRoot

获取一个对象，该对象可用于同步对 OrderedDictionary 对象的访问。
IDeserializationCallback.OnDeserialization(Object)

实现接口， ISerializable 并在反序列化完成后由反序列化事件调用。
IDictionary.IsFixedSize

获取一个值，该值指示是否 OrderedDictionary 具有固定大小。
IEnumerable.GetEnumerator()

返回循环 IDictionaryEnumerator 访问集合的对象 OrderedDictionary 。

扩展方法

名称 说明
AsParallel(IEnumerable)

启用查询的并行化。
AsQueryable(IEnumerable)

将 IEnumerable 转换为 IQueryable。
Cast<TResult>(IEnumerable)

将 IEnumerable 的元素强制转换为指定类型。
OfType<TResult>(IEnumerable)

根据指定类型筛选 IEnumerable 的元素。

适用于