在C#中的StringDictionary中获取键的集合
要获取StringDictionary中的键集合，代码如下-
示例
using System;
using System.Collections;
using System.Collections.Specialized;
public class Demo {
public static void Main(){
StringDictionary strDict1 = new StringDictionary();
strDict1.Add("U", "Electronics");
strDict1.Add("V", "Toys");
strDict1.Add("W", "Books");
strDict1.Add("X", "Accessories");
Console.WriteLine("StringDictionary1 elements...");
foreach(DictionaryEntry d in strDict1){
Console.WriteLine(d.Key + " " + d.Value);
}
Console.WriteLine("Does StringDictionary1 has key G? "+strDict1.ContainsKey("G"));
StringDictionary strDict2 = new StringDictionary();
strDict2.Add("A", "John");
strDict2.Add("B", "Andy");
strDict2.Add("C", "Tim");
strDict2.Add("D", "Ryan");
strDict2.Add("E", "Kevin");
strDict2.Add("F", "Katie");
strDict2.Add("G", "Brad");
Console.WriteLine("\nStringDictionary2 elements...");
foreach(DictionaryEntry d in strDict2){
Console.WriteLine(d.Key + " " + d.Value);
}
Console.WriteLine("\nCollection of keys (StringDictionary2)...");
String[] keyArr = new String[strDict2.Count];
strDict2.Keys.CopyTo(keyArr, 0);
for (int i = 0; i < strDict2.Count; i++) {
Console.WriteLine("Key "+(i+1)+" = "+keyArr[i]);
}
Console.WriteLine("\nIs Dictionary2 equal to Dictionary1? = "+strDict2.Equals(strDict1));
Console.WriteLine("Does StringDictionary2 has key B? "+strDict2.ContainsKey("B"));
}
}输出结果
这将产生以下输出-
StringDictionary1 elements... x Accessories u Electronics v Toys w Books Does StringDictionary1 has key G? False StringDictionary2 elements... a John b Andy c Tim d Ryan e Kevin f Katie g Brad Collection of keys (StringDictionary2)... Key 1 = a Key 2 = b Key 3 = c Key 4 = d Key 5 = e Key 6 = f Key 7 = g Is Dictionary2 equal to Dictionary1? = False Does StringDictionary2 has key B? True
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(){
StringDictionary strDict1 = new StringDictionary();
strDict1.Add("S", "Home Appliances");
strDict1.Add("T", "Smart Wearable Tech");
strDict1.Add("U", "Electronics");
strDict1.Add("V", "Toys");
strDict1.Add("W", "Books");
strDict1.Add("X", "Accessories");
Console.WriteLine("StringDictionary elements...");
foreach(DictionaryEntry d in strDict1){
Console.WriteLine(d.Key + " " + d.Value);
}
Console.WriteLine("\nCollection of keys and values...");
String[] keyArr = new String[strDict1.Count];
strDict1.Keys.CopyTo(keyArr, 0);
for (int i = 0; i < strDict1.Count; i++) {
Console.WriteLine("Key "+(i+1)+" = "+keyArr[i]+", Value "+(i+1)+" = "+strDict1[keyArr[i]]);
}
Console.WriteLine("\nDoes StringDictionary has key B? "+strDict1.ContainsKey("B"));
}
}输出结果
这将产生以下输出-
StringDictionary elements... x Accessories s Home Appliances t Smart Wearable Tech u Electronics v Toys w Books Collection of keys and values... Key 1 = x, Value 1 = Accessories Key 2 = s, Value 2 = Home Appliances Key 3 = t, Value 3 = Smart Wearable Tech Key 4 = u, Value 4 = Electronics Key 5 = v, Value 5 = Toys Key 6 = w, Value 6 = Books Does StringDictionary has key B? False