C# C# |获取包含混合字典

C# |获取包含混合字典

中关键字的集合

原文:https://www . geeksforgeeks . org/c-sharp-get-an-I collection-包含-key-in-hybrid dictionary/

杂交词典。Keys 属性用于获取包含混合字典中的键的 ICollection。

语法:

public System.Collections.ICollection Keys { get; }

返回值:它返回一个包含混合字典中的键的集合。

以下程序说明了混合词典的使用。按键属性:

例 1:

// C# code to get an ICollection containing
// the keys in the HybridDictionary.
using System;
using System.Collections;
using System.Collections.Specialized;

class GFG {

    // Driver code
    public static void Main()
    {

        // Creating a HybridDictionary named myDict
        HybridDictionary myDict = new HybridDictionary();

        // Adding key/value pairs in myDict
        myDict.Add("A", "Apple");
        myDict.Add("B", "Banana");
        myDict.Add("C", "Cat");
        myDict.Add("D", "Dog");
        myDict.Add("E", "Elephant");
        myDict.Add("F", "Fish");

        // Creating a String arr named myArr
        String[] myArr = new String[myDict.Count];

        // copying the Keys in HybridDictionary
        // to a one-dimensional Array instance
        // at the specified index.
        myDict.Keys.CopyTo(myArr, 0);

        // To get an ICollection containing
        // the keys in the HybridDictionary
        for (int i = 0; i < myDict.Count; i++)
            Console.WriteLine(myArr[i]);
    }
}

输出:

A
B
C
D
E
F

例 2:

// C# code to get an ICollection containing
// the keys in the HybridDictionary.
using System;
using System.Collections;
using System.Collections.Specialized;

class GFG {

    // Driver code
    public static void Main()
    {

        // Creating a HybridDictionary named myDict
        HybridDictionary myDict = new HybridDictionary();

        // Adding key/value pairs in myDict
        myDict.Add("I", "first");
        myDict.Add("II", "second");
        myDict.Add("III", "third");
        myDict.Add("IV", "fourth");
        myDict.Add("V", "fifth");

        // Creating a String arr named myArr
        String[] myArr = new String[myDict.Count];

        // copying the Keys in HybridDictionary
        // to a one-dimensional Array instance
        // at the specified index.
        myDict.Keys.CopyTo(myArr, 0);

        // To get an ICollection containing
        // the keys in the HybridDictionary
        for (int i = 0; i < myDict.Count; i++)
            Console.WriteLine(myArr[i]);
    }
}

输出:

I
II
III
IV
V

注:

icocollection 中值的顺序未指定，但它与 Values 方法返回的 icocollection 中关联值的顺序相同。
返回的 ICollection 不是静态副本。取而代之的是，ICollection 指的是原始混合字典中的键。因此，对混合词典的更改将继续反映在 ICollection 中。
检索该属性的值是一个 O(1)操作。

参考: