C# 中的 HybridDictionary 類?
HybridDictionary 類透過使用 ListDictionary 實現 IDictionary 介面,當集合較小時使用 ListDictionary,當集合變大時切換到 Hashtable。
以下是 HybridDictionary 類的屬性:
| 序號 | 屬性及描述 |
|---|---|
| 1 | Count 獲取 HybridDictionary 中包含的鍵值對的數量。 |
| 2 | IsFixedSize 獲取一個值,該值指示 HybridDictionary 是否具有固定大小。 |
| 3 | IsReadOnly 獲取一個值,該值指示 HybridDictionary 是否為只讀。 |
| 4 | IsSynchronized 獲取一個值,該值指示 HybridDictionary 是否已同步(執行緒安全)。 |
| 5 | Item[Object] 獲取或設定與指定鍵關聯的值。 |
| 6 | Keys 獲取包含 HybridDictionary 中鍵的 ICollection。 |
| 7 | SyncRoot 獲取一個物件,該物件可用於同步對 HybridDictionary 的訪問。 |
| 8 | Values 獲取包含 HybridDictionary 中值的 ICollection。 |
以下是 HybridDictionary 類的一些方法:
| 序號 | 方法及描述 |
|---|---|
| 1 | Add(Object, Object) 向 HybridDictionary 中新增具有指定鍵和值的條目。 |
| 2 | Clear() 移除 HybridDictionary 中的所有條目。 |
| 3 | Contains(Object) 確定 HybridDictionary 是否包含特定鍵。 |
| 4 | CopyTo(Array, Int32) 將 HybridDictionary 條目複製到指定索引處的一維陣列例項。 |
| 5 | Equals(Object) 確定指定物件是否等於當前物件。(繼承自 Object) |
| 6 | GetEnumerator() 返回一個 IDictionaryEnumerator,該列舉器遍歷 HybridDictionary。 |
| 7 | GetHashCode() 用作預設雜湊函式。(繼承自 Object) |
| 8 | GetType() 獲取當前例項的 Type。(繼承自 Object) |
要計算 HybridDictionary 中鍵值對的數量,程式碼如下:
示例
現在讓我們看一些示例:
using System;
using System.Collections;
using System.Collections.Specialized;
public class Demo {
public static void Main() {
HybridDictionary dict1 = new HybridDictionary();
dict1.Add("A", "SUV");
dict1.Add("B", "MUV");
dict1.Add("C", "AUV");
Console.WriteLine("HybridDictionary1 elements...");
foreach(DictionaryEntry d in dict1) {
Console.WriteLine(d.Key + " " + d.Value);
}
Console.WriteLine("Count of Key/value pairs in Dictionary1 = "+dict1.Count);
HybridDictionary dict2 = new HybridDictionary();
dict2.Add("1", "One");
dict2.Add("2", "Two");
dict2.Add("3", "Three");
dict2.Add("4", "Four");
dict2.Add("5", "Five");
dict2.Add("6", "Six");
Console.WriteLine("
HybridDictionary2 elements...");
foreach(DictionaryEntry d in dict2) {
Console.WriteLine(d.Key + " " + d.Value);
}
Console.WriteLine("Count of Key/value pairs in Dictionary2 = "+dict1.Count);
dict2.Clear();
Console.WriteLine("Count of Key/value pairs in Dictionary2 (Updated) = "+dict2.Count);
}
}輸出
這將產生以下輸出:
HybridDictionary1 elements... A SUV B MUV C AUV Count of Key/value pairs in Dictionary1 = 3 HybridDictionary2 elements... 1 One 2 Two 3 Three 4 Four 5 Five 6 Six Count of Key/value pairs in Dictionary2 = 3 Count of Key/value pairs in Dictionary2 (Updated) = 0
要檢查 HybridDictionary 是否已同步,程式碼如下:
示例
using System;
using System.Collections;
using System.Collections.Specialized;
public class Demo {
public static void Main() {
HybridDictionary dict1 = new HybridDictionary();
dict1.Add("A", "Books");
dict1.Add("B", "Electronics");
dict1.Add("C", "Smart Wearables");
dict1.Add("D", "Pet Supplies");
dict1.Add("E", "Clothing");
dict1.Add("F", "Footwear");
Console.WriteLine("HybridDictionary1 elements...");
foreach(DictionaryEntry d in dict1) {
Console.WriteLine(d.Key + " " + d.Value);
}
Console.WriteLine("Is the HybridDictionary1 having fixed size? = "+dict1.IsFixedSize);
Console.WriteLine("If HybridDictionary1 read-only? = "+dict1.IsReadOnly);
Console.WriteLine("Is HybridDictionary1 synchronized = "+dict1.IsSynchronized);
HybridDictionary dict2 = new HybridDictionary();
dict2.Add("1", "One");
dict2.Add("2", "Two");
dict2.Add("3", "Three");
dict2.Add("4", "Four");
dict2.Add("5", "Five");
dict2.Add("6", "Six");
Console.WriteLine("
HybridDictionary2 elements...");
foreach(DictionaryEntry d in dict2) {
Console.WriteLine(d.Key + " " + d.Value);
}
Console.WriteLine("Is HybridDictionary1 equal to HybridDictionary2? = "+(dict1.Equals(dict2)));
Console.WriteLine("Is the HybridDictionary2 having fixed size? = "+dict2.IsFixedSize);
Console.WriteLine("If HybridDictionary2 read-only? = "+dict2.IsReadOnly);
Console.WriteLine("Is HybridDictionary2 synchronized = "+dict2.IsSynchronized);
}
}輸出
這將產生以下輸出:
HybridDictionary1 elements... A Books B Electronics C Smart Wearables D Pet Supplies E Clothing F Footwear Is the HybridDictionary1 having fixed size? = False If HybridDictionary1 read-only? = False Is HybridDictionary1 synchronized = False HybridDictionary2 elements... 1 One 2 Two 3 Three 4 Four 5 Five 6 Six Is HybridDictionary1 equal to HybridDictionary2? = False Is the HybridDictionary2 having fixed size? = False If HybridDictionary2 read-only? = False Is HybridDictionary2 synchronized = False
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