此属性用于获取字典中包含的键/值对的数量。
句法：
public int Count { get; }
返回值：词典中包含的键/值对的数量。
下面是说明上述财产的使用的程序：
范例1：
// C# code to count the number of
// key/value pairs in Dictionary
using System;
using System.Collections.Generic;
class GFG {
// Driver code
public static void Main()
{
// Create a new dictionary of
// strings, with string keys.
Dictionary myDict =
new Dictionary();
// 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");
// To get count of key/value
// pairs in myDict
Console.WriteLine("Total key/value pairs"+
" in myDict are : " + myDict.Count);
}
}
输出：
Total key/value pairs in myDict are : 6
范例2：
// C# code to count the number of
// key/value pairs in Dictionary
using System;
using System.Collections.Generic;
class GFG {
// Driver code
public static void Main()
{
// Create a new dictionary of
// strings, with string keys.
Dictionary myDict =
new Dictionary();
// Adding key/value pairs in myDict
myDict.Add(1, "C");
myDict.Add(2, "C++");
myDict.Add(3, "Java");
myDict.Add(4, "Python");
myDict.Add(5, "C#");
myDict.Add(6, "HTML");
// To get count of key/value pairs in myDict
Console.WriteLine("Total key/value pairs"+
" in myDict are : " + myDict.Count);
}
}
输出：
Total key/value pairs in myDict are : 6
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.generic.dictionary-2.count?view=netframework-4.7.2#System_Collections_Generic_Dictionary_2_Count