获取C#中ListDictionary中包含的键/值对的数量
要获取ListDictionary中包含的键/值对的数量,代码如下-
示例
using System;using System.Collections;
using System.Collections.Specialized;
public class Demo {
public static void Main(){
ListDictionary dict1 = new ListDictionary();
dict1.Add("A", "Books");
dict1.Add("B", "Electronics");
dict1.Add("C", "Smart Wearables");
dict1.Add("D", "Pet Supplies");
dict1.Add("E", "Clothing");
dict1.Add("F", "Footwear");
Console.WriteLine("ListDictionary1 elements...");
foreach(DictionaryEntry d in dict1){
Console.WriteLine(d.Key + " " + d.Value);
}
ListDictionary dict2 = new ListDictionary();
dict2.Add("1", "One");
dict2.Add("2", "Two");
dict2.Add("3", "Three");
dict2.Add("4", "Four");
dict2.Add("5", "Five");
dict2.Add("6", "Six");
Console.WriteLine("\nListDictionary2 elements...");
foreach(DictionaryEntry d in dict2){
Console.WriteLine(d.Key + " " + d.Value);
}
Console.WriteLine("Count of key/value pairs in Dictionary 2 = "+dict2.Count);
ListDictionary dict3 = new ListDictionary();
dict3 = dict2;
Console.WriteLine("\nIs ListDictionary3 equal to ListDictionary2? = "+(dict3.Equals(dict2)));
dict3.Clear();
Console.WriteLine("Count of key/value pairs in Dictionary 3 = "+dict3.Count);
}
}
输出结果
这将产生以下输出-
ListDictionary1 elements...A Books
B Electronics
C Smart Wearables
D Pet Supplies
E Clothing
F Footwear
ListDictionary2 elements...
1 One
2 Two
3 Three
4 Four
5 Five
6 Six
Count of key/value pairs in Dictionary 2 = 6
Is ListDictionary3 equal to ListDictionary2? = True
Count of key/value pairs in Dictionary 3 = 0
示例
让我们看另一个例子-
using System;using System.Collections;
using System.Collections.Specialized;
public class Demo {
public static void Main(){
ListDictionary dict1 = new ListDictionary();
dict1.Add("A", "Books");
dict1.Add("B", "Electronics");
dict1.Add("C", "Smart Wearables");
dict1.Add("D", "Pet Supplies");
dict1.Add("E", "Clothing");
Console.WriteLine("ListDictionary1 elements...");
foreach(DictionaryEntry d in dict1){
Console.WriteLine(d.Key + " " + d.Value);
}
Console.WriteLine("Count of key/value pairs in Dictionary1 = "+dict1.Count);
ListDictionary dict2 = new ListDictionary();
dict2.Add("1", "One");
dict2.Add("2", "Two");
dict2.Add("3", "Three");
dict2.Add("4", "Four");
dict2.Add("5", "Five");
dict2.Add("6", "Six");
Console.WriteLine("\nListDictionary2 key-value pairs...");
IDictionaryEnumerator demoEnum = dict2.GetEnumerator();
while (demoEnum.MoveNext())
Console.WriteLine("Key = " + demoEnum.Key + ", Value = "+ demoEnum.Value);
Console.WriteLine("Count of key/value pairs in Dictionary2 = "+dict2.Count);
}
}
输出结果
这将产生以下输出-
ListDictionary1 elements...A Books
B Electronics
C Smart Wearables
D Pet Supplies
E Clothing
Count of key/value pairs in Dictionary1 = 5
ListDictionary2 key-value pairs...
Key = 1, Value = One
Key = 2, Value = Two
Key = 3, Value = Three
Key = 4, Value = Four
Key = 5, Value = Five
Key = 6, Value = Six
Count of key/value pairs in Dictionary2 = 6
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