📜  C#|在StringDictionary中获取值的集合

📅  最后修改于: 2021-05-29 22:19:55             🧑  作者: Mango

StringDictionary.Values属性用于获取StringDictionary中的值的集合。

句法:

public virtual System.Collections.ICollection Values { get; }

返回值:一个ICollection,它提供StringDictionary中的值。

范例1:

// C# code to get a collection
// of values in the StringDictionary
using System;
using System.Collections;
using System.Collections.Specialized;
  
class GFG {
  
    // Driver code
    public static void Main()
    {
  
        // Creating a StringDictionary named myDict
        StringDictionary myDict = new StringDictionary();
  
        // Adding key and value into the StringDictionary
        myDict.Add("A", "Apple");
        myDict.Add("B", "Banana");
        myDict.Add("C", "Cat");
        myDict.Add("D", "Dog");
  
        // Getting a collection of values
        // in the StringDictionary
        foreach(string val in myDict.Values)
        {
            Console.WriteLine(val);
        }
    }
}

输出:

Dog
Banana
Cat
Apple

范例2:

// C# code to get a collection
// of values in the StringDictionary
using System;
using System.Collections;
using System.Collections.Specialized;
  
class GFG {
  
    // Driver code
    public static void Main()
    {
  
        // Creating a StringDictionary named myDict
        StringDictionary myDict = new StringDictionary();
  
        // Adding key and value into the StringDictionary
        myDict.Add("3", "prime & odd");
        myDict.Add("2", "prime & even");
        myDict.Add("4", "non-prime & even");
        myDict.Add("9", "non-prime & odd");
  
        // Getting a collection of values
        // in the StringDictionary
        foreach(string val in myDict.Values)
        {
            Console.WriteLine(val);
        }
    }
}

输出:

prime & even
prime & odd
non-prime & odd
non-prime & even

笔记:

  • ICollection中值的顺序未指定,但与Keys方法返回的ICollection中的关联键相同。
  • 返回的ICollection不是静态副本。而是,ICollection返回原始StringDictionary中的值。因此,对StringDictionary的更改将继续反映在ICollection中。
  • 检索此属性的值是O(1)操作。

参考:

  • https://docs.microsoft.com/zh-cn/dotnet/api/system.collections.specialized.stringdictionary.values?view=netframework-4.7.2