C#中SortedList和SortedDictionary的区别

在 C# 中， SortedList是根据键排序的键/值对的集合。默认情况下，此集合按升序对键/值对进行排序。它是通用和非通用类型的集合。通用 SortedList 在System.Collections.Generic命名空间中定义，而非通用 SortedList 在System.Collections命名空间下定义。

例子：

// C# program to illustrate how
// to create a sortedlist
using System;
using System.Collections;
  
class GFG {
  
    // Main Method
    static public void Main()
    {
  
        // Creating a sortedlist
        // Using SortedList class
        SortedList my_Slist = new SortedList();
  
        // Adding key/value pairs in
        // SortedList using Add() method
        my_Slist.Add(1.02, "Dog");
        my_Slist.Add(1.07, "Cat");
        my_Slist.Add(1.04, "Rat");
        my_Slist.Add(1.01, "Bird");
  
        foreach(DictionaryEntry pair in my_Slist)
        {
            Console.WriteLine("{0} and {1}",
                      pair.Key, pair.Value);
        }
        Console.WriteLine();
    }
}

输出：

1.01 and Bird
1.02 and Dog
1.04 and Rat
1.07 and Cat

在 C# 中， SortedDictionary是一个泛型集合，用于以排序形式存储键/值对，并在键上完成排序。 SortedDictionary 在System.Collection.Generic命名空间下定义。它本质上是动态的，这意味着排序字典的大小根据需要增长。

例子：

// C# program to illustrate how
// to create a sorted dictionary
using System;
using System.Collections.Generic;
  
class GFG {
  
    // Main Method
    static public void Main()
    {
  
        // Creating sorted dictionary
        // Using SortedDictionary class
        SortedDictionary My_sdict = 
            new SortedDictionary();
  
        // Adding key/value pair in Sorted
        // Dictionary Using Add() method
        My_sdict.Add(004, "Roscosmos");
        My_sdict.Add(003, "ESA");
        My_sdict.Add(001, "NASA");
        My_sdict.Add(005, "ISRO");
        My_sdict.Add(002, "CNSA");
        Console.WriteLine("Top 5 space agencies 2018:");
  
        // Accessing the key/value pair of the
        // SortedDictionary Using foreach loop
        foreach(KeyValuePair pair in My_sdict)
        {
            Console.WriteLine("Rank: {0} and Name: {1}",
                                  pair.Key, pair.Value);
        }
    }
}

输出：

Top 5 space agencies 2018:
Rank: 1 and Name: NASA
Rank: 2 and Name: CNSA
Rank: 3 and Name: ESA
Rank: 4 and Name: Roscosmos
Rank: 5 and Name: ISRO

以下是 SortedList 和 SortedDictionary 之间的一些区别：

SortedList	SortedDictionary
The memory of SortedList is an overhead.	The memory of SortedDictionary is not bottlenecked.
In SortedList, the elements are stored in a continuous block in memory.	In SortedDictionary, the elements are stored in separate object that can spread all over the heap.
In SoterdList, the memory fragmentation is high.	In SoterdDictionary, the memory fragmentation is low.
It require less memory for storage.	It require more memory for storage.
In SortedList, less inserts and delete operations are required.	In SortedDictionary, more inserts and delete operations are required.
In SortedList, you can access elements using the index.	In SortedDictionary, you can access elements using index or key. Here key access is sufficient there is no need of accessing elements using index.
In SortedList, data are already in sorted form.	In SortedDictionary, data are in un-sorted form.