如何在 C# 中创建有序字典
原文:https://www . geeksforgeeks . org/how-to-create-ordered dictionary-in-c-sharp/
OrderedDictionary()构造函数用于初始化 OrderedDictionary 类的新实例，该实例将为空，并将具有默认的初始容量。orderedddictionary 类表示可由键或索引访问的键/值对的集合。它存在于System.Collections.Specialized命名空间中。
语法:
public OrderedDictionary();
例 1:
// C# Program to illustrate how
// to create a OrderedDictionary
using System;
using System.Collections;
using System.Collections.Specialized;
class Geeks {
// Main Method
public static void Main(String[] args)
{
// od is the OrderedDictionary object
// OrderedDictionary() is the constructor
// used to initializes a new
// instance of the OrderedDictionary class
OrderedDictionary od = new OrderedDictionary();
// Count property is used to get the
// number of elements in OrderedDictionary
// It will give 0 as no elements
// are present currently
Console.WriteLine("The number of elements: "
+od.Count);
}
}
Output:
The number of elements: 0
例 2:
// C# Program to illustrate how
// to create a OrderedDictionary
using System;
using System.Collections;
using System.Collections.Specialized;
class Geeks {
// Main Method
public static void Main(String[] args)
{
// od is the OrderedDictionary object
// OrderedDictionary() is the constructor
// used to initializes a new
// instance of the OrderedDictionary class
OrderedDictionary od = new OrderedDictionary();
Console.Write("Before Add Method: ");
// Count property is used to get the
// number of elements in OrderedDictionary
// It will give 0 as no elements
// are present currently
Console.WriteLine(od.Count);
// Adding key/value pairs in od
od.Add("1", "C");
od.Add("2", "C++");
od.Add("3", "Java");
od.Add("4", "C#");
Console.Write("After Add Method: ");
// Count property is used to get the
// number of elements in ld
Console.WriteLine(od.Count);
}
}
Output:
Before Add Method: 0
After Add Method: 4
参考:
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