📜  C#|在SortedList对象中获取键

📅  最后修改于: 2021-05-29 16:43:08             🧑  作者: Mango

SortedList.Keys属性用于获取SortedList对象中的键。

句法:

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

属性值:一个ICollection对象,其中包含SortedList对象中的键。

下面的程序说明了上面讨论的属性的用法:

范例1:

// C# code to get an ICollection containing
// the keys in the SortedList
using System;
using System.Collections;
  
class GFG {
  
    // Driver code
    public static void Main()
    {
  
        // Creating a SortedList
        SortedList mylist = new SortedList();
  
        // Adding elements in SortedList
        mylist.Add("4", "Even");
        mylist.Add("9", "Odd");
        mylist.Add("5", "Odd and Prime");
        mylist.Add("2", "Even and Prime");
  
        // Get a collection of the keys.
        ICollection c = mylist.Keys;
  
        // Displaying the contents
        foreach(string str in c)
            Console.WriteLine(str + ": " + mylist[str]);
    }
}
输出:
2: Even and Prime
4: Even
5: Odd and Prime
9: Odd

范例2:

// C# code to get an ICollection containing
// the keys in the SortedList.
using System;
using System.Collections;
  
class GFG {
  
    // Driver code
    public static void Main()
    {
  
        // Creating a SortedList
        SortedList mylist = new SortedList();
  
        // Adding elements in SortedList
        mylist.Add("India", "Country");
        mylist.Add("Chandigarh", "City");
        mylist.Add("Mars", "Planet");
        mylist.Add("China", "Country");
  
        // Get a collection of the keys.
        ICollection c = mylist.Keys;
  
        // Displaying the contents
        foreach(string str in c)
            Console.WriteLine(str + ": " + mylist[str]);
    }
}
输出:
Chandigarh: City
China: Country
India: Country
Mars: Planet

笔记:

  • ICollection对象是SortedList对象的键的只读视图。对基础SortedList的修改将立即反映在ICollection中。
  • ICollection的元素按与SortedList的键相同的顺序排序。
  • 此属性类似于GetKeyList方法,但返回ICollection对象而不是IList对象。
  • 此方法是O(1)操作。

参考:

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