C#中的SortedDictionary.Keys属性
C#中的SortedDictionary.Keys属性用于获取包含SortedDictionary<TKey，TValue>中的键的集合。
语法
语法如下-
public System.Collections.Generic.SortedDictionary<TKey,TValue>.KeyCollection Keys { get; }示例
现在让我们看一个例子-
using System;
using System.Collections;
using System.Collections.Generic;
public class Demo {
public static void Main(){
SortedDictionary<int, string> sortedDict = new SortedDictionary<int, string>();
sortedDict.Add(1, "SUV");
sortedDict.Add(2, "MUV");
sortedDict.Add(3, "Utility Vehicle");
sortedDict.Add(4, "AUV");
sortedDict.Add(5, "Hatchback");
sortedDict.Add(6, "Convertible");
Console.WriteLine("SortedDictionary key-value pairs...");
IDictionaryEnumerator demoEnum = sortedDict.GetEnumerator();
while (demoEnum.MoveNext())
Console.WriteLine("Key = " + demoEnum.Key + ", Value = " + demoEnum.Value);
Console.WriteLine("Count of SortedDictionary key-value pairs = "+sortedDict.Count);
sortedDict.Add(7, "Seven");
sortedDict.Add(8, "Eight");
Console.WriteLine("\nSortedDictionary key-value pairs...UPDATED");
demoEnum = sortedDict.GetEnumerator();
while (demoEnum.MoveNext())
Console.WriteLine("Key = " + demoEnum.Key + ", Value = " + demoEnum.Value);
Console.WriteLine("Count of SortedDictionary key-value pairs (UPDATED) = "+sortedDict.Count);
Console.WriteLine("Value in the SortedDictionary key-value pair key five = "+sortedDict[5]);
sortedDict[5] = "Crossover";
Console.WriteLine("Value in the SortedDictionary key-value pair key five (updated) = "+sortedDict[5]);
SortedDictionary<int, string>.KeyCollection keyColl = sortedDict.Keys;
Console.WriteLine("\nKeys...");
foreach( int i in keyColl ){
Console.WriteLine(i);
}
}
}输出结果
这将产生以下输出-
SortedDictionary key-value pairs... Key = 1, Value = SUV Key = 2, Value = MUV Key = 3, Value = Utility Vehicle Key = 4, Value = AUV Key = 5, Value = Hatchback Key = 6, Value = Convertible Count of SortedDictionary key-value pairs = 6 SortedDictionary key-value pairs...UPDATED Key = 1, Value = SUV Key = 2, Value = MUV Key = 3, Value = Utility Vehicle Key = 4, Value = AUV Key = 5, Value = Hatchback Key = 6, Value = Convertible Key = 7, Value = Seven Key = 8, Value = Eight Count of SortedDictionary key-value pairs (UPDATED) = 8 Value in the SortedDictionary key-value pair key five = Hatchback Value in the SortedDictionary key-value pair key five (updated) = Crossover Keys... 1 2 3 4 5 6 7 8
示例
现在让我们来看另一个示例-
using System;
using System.Collections;
using System.Collections.Generic;
public class Demo {
public static void Main(){
SortedDictionary<int, string> sortedDict = new SortedDictionary<int, string>();
sortedDict.Add(100, "Mobile");
sortedDict.Add(200, "Laptop");
sortedDict.Add(300, "Desktop");
sortedDict.Add(400, "Speakers");
sortedDict.Add(500, "Headphone");
sortedDict.Add(600, "Earphone");
Console.WriteLine("SortedDictionary key-value pairs...");
IDictionaryEnumerator demoEnum = sortedDict.GetEnumerator();
while (demoEnum.MoveNext())
Console.WriteLine("Key = " + demoEnum.Key + ", Value = " + demoEnum.Value);
Console.WriteLine("\nThe SortedDictionary has the key 200? = "+sortedDict.ContainsKey(200));
SortedDictionary<int, string>.KeyCollection keyColl = sortedDict.Keys;
Console.WriteLine("\nKeys...");
foreach( int i in keyColl ){
Console.WriteLine(i);
}
}
}输出结果
这将产生以下输出-
SortedDictionary key-value pairs... Key = 100, Value = Mobile Key = 200, Value = Laptop Key = 300, Value = Desktop Key = 400, Value = Speakers Key = 500, Value = Headphone Key = 600, Value = Earphone The SortedDictionary has the key 200? = True Keys... 100 200 300 400 500 600