C#中的Dictionary.Keys属性
C#中的Dictionary.Keys属性用于获取Dictionary中的所有键。
语法
以下是语法-
public System.Collections.Generic.Dictionary<TKey, TValue>.KeyCollection Keys { get; }示例
现在让我们看一个实现Dictionary.Keys属性的示例-
using System;
using System.Collections.Generic;
public class Demo {
public static void Main(){
Dictionary<string, string> dict =
new Dictionary<string, string>();
dict.Add("One", "Kagido");
dict.Add("Two", "Ngidi");
dict.Add("Three", "Devillers");
dict.Add("Four", "Smith");
dict.Add("Five", "Warner");
Console.WriteLine("Count of elements = "+dict.Count);
Console.WriteLine("\nKey/value pairs...");
foreach(KeyValuePair<string, string> res in dict){
Console.WriteLine("Key = {0}, Value = {1}", res.Key, res.Value);
}
Console.Write("\nAll the keys..\n");
Dictionary<string, string>.KeyCollection allKeys =
dict.Keys;
foreach(string str in allKeys){
Console.WriteLine("Key = {0}", str);
}
}
}输出结果
这将产生以下输出-
Count of elements = 5 Key/value pairs... Key = One, Value = Kagido Key = Two, Value = Ngidi Key = Three, Value = Devillers Key = Four, Value = Smith Key = Five, Value = Warner All the keys.. Key = One Key = Two Key = Three Key = Four Key = Five
示例
现在让我们来看另一个实现Dictionary.Keys属性的示例-
using System;
using System.Collections.Generic;
public class Demo {
public static void Main(){
Dictionary<string, string> dict =
new Dictionary<string, string>();
dict.Add("One", "Chris");
dict.Add("Two", "Steve");
dict.Add("Three", "Messi");
dict.Add("Four", "Ryan");
dict.Add("Five", "Nathan");
Console.WriteLine("Count of elements = "+dict.Count);
Console.WriteLine("\nKey/value pairs...");
foreach(KeyValuePair<string, string> res in dict){
Console.WriteLine("Key = {0}, Value = {1}", res.Key, res.Value);
}
Console.WriteLine("Value for key three = "+dict["Three"]);
dict["Three"] = "Katie";
Console.WriteLine("Updated value associated with key Three...");
Console.WriteLine(dict["Three"]);
Console.Write("\nAll the keys..\n");
Dictionary<string, string>.KeyCollection allKeys = dict.Keys;
foreach(string str in allKeys){
Console.WriteLine("Key = {0}", str);
}
}
}输出结果
这将产生以下输出-
Count of elements = 5 Key/value pairs... Key = One, Value = Chris Key = Two, Value = Steve Key = Three, Value = Messi Key = Four, Value = Ryan Key = Five, Value = Nathan Value for key three = Messi Updated value associated with key Three... Katie All the keys.. Key = One Key = Two Key = Three Key = Four Key = Five