如何在 C# 中创建列表字典
原文:https://www . geesforgeks . org/如何创建 c-sharp 中的 list dictionary/
ListDictionary()构造函数用于使用默认比较器初始化 ListDictionary 类的一个新的空实例。列表词典是一个专门的集合。它属于System.Collections.Specialized命名空间。此类型表示非泛型字典类型。它是用链表实现的。这个类是小列表的字典集合(System.Collections.IDictionary)的简单实现。
语法:
public ListDictionary ();
例 1:
// C# Program to illustrate how
// to create a ListDictionary
using System;
using System.Collections;
using System.Collections.Specialized;
class Geeks {
// Main Method
public static void Main(String[] args)
{
// ld is the ListDictionary object
// ListDictionary() is the constructor
// used to initializes a new
// instance of the ListDictionary class
ListDictionary ld = new ListDictionary();
// Count property is used to get the
// number of elements in ListDictionary
// It will give 0 as no elements
// are present currently
Console.WriteLine("The number of elements: "+
ld.Count);
}
}
Output:
The number of elements: 0
例 2:
// C# Program to illustrate how
// to create a ListDictionary
using System;
using System.Collections;
using System.Collections.Specialized;
class Geeks {
// Main Method
public static void Main(String[] args)
{
// ld is the ListDictionary object
// ListDictionary() is the constructor
// used to initializes a new
// instance of the ListDictionary class
ListDictionary ld = new ListDictionary();
Console.Write("Before Add Method: ");
// Count property is used to get the
// number of elements in ListDictionary
// It will give 0 as no elements
// are present currently
Console.WriteLine(ld.Count);
// Adding key/value pairs in ld
ld.Add("Australia", "Canberra");
ld.Add("Belgium", "Brussels");
ld.Add("Netherlands", "Amsterdam");
ld.Add("China", "Beijing");
ld.Add("Russia", "Moscow");
ld.Add("India", "New Delhi");
Console.Write("After Add Method: ");
// Count property is used to get the
// number of elements in ld
Console.WriteLine(ld.Count);
}
}
Output:
Before Add Method: 0
After Add Method: 6
参考:
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