ListDictionary.Count属性用于获取ListDictionary中包含的键/值对的数量。
句法:
public int Count { get; }
返回值: ListDictionary中包含的键/值对的数量。
下面的程序说明了ListDictionary.Count属性的用法:
范例1:
// C# code to get the number
// of key/value pairs contained
// in the ListDictionary
using System;
using System.Collections;
using System.Collections.Specialized;
class GFG {
// Driver code
public static void Main()
{
// Creating a ListDictionary named myDict
ListDictionary myDict = new ListDictionary();
// Adding key/value pairs in myDict
myDict.Add("Australia", "Canberra");
myDict.Add("Belgium", "Brussels");
myDict.Add("Netherlands", "Amsterdam");
myDict.Add("China", "Beijing");
myDict.Add("Russia", "Moscow");
myDict.Add("India", "New Delhi");
// Displaying the number of key/value
// pairs contained in the ListDictionary
Console.WriteLine(myDict.Count);
}
}
输出:
6
范例2:
// C# code to get the number
// of key/value pairs contained
// in the ListDictionary
using System;
using System.Collections;
using System.Collections.Specialized;
class GFG {
// Driver code
public static void Main()
{
// Creating a ListDictionary named myDict
ListDictionary myDict = new ListDictionary();
// Adding key/value pairs in myDict
myDict.Add("I", "first");
myDict.Add("II", "second");
myDict.Add("III", "third");
myDict.Add("IV", "fourth");
myDict.Add("V", "fifth");
// Displaying the number of key/value
// pairs contained in the ListDictionary
Console.WriteLine(myDict.Count);
}
}
输出:
5
注意: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.listdictionary.count?view=netframework-4.7.2