检查StringDictionary是否在C#中包含特定键
要检查StringDictionary是否包含特定键，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("A", "John");
strDict1.Add("B", "Andy");
strDict1.Add("C", "Tim");
strDict1.Add("D", "Ryan");
strDict1.Add("E", "Kevin");
strDict1.Add("F", "Katie");
strDict1.Add("G", "Brad");
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("\nIs Dictionary2 equal to Dictionary1? = "+strDict2.Equals(strDict1));
}
}输出结果
这将产生以下输出-
StringDictionary1 elements... a John b Andy c Tim d Ryan e Kevin f Katie g Brad Does StringDictionary1 has key G? True StringDictionary2 elements... a John b Andy c Tim d Ryan e Kevin f Katie g Brad Is Dictionary2 equal to Dictionary1? = False
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("A", "John");
strDict1.Add("B", "Andy");
strDict1.Add("C", "Tim");
strDict1.Add("D", "Ryan");
strDict1.Add("E", "Kevin");
strDict1.Add("F", "Katie");
strDict1.Add("G", "Brad");
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("\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... a John b Andy c Tim d Ryan e Kevin f Katie g Brad Does StringDictionary1 has key G? True StringDictionary2 elements... a John b Andy c Tim d Ryan e Kevin f Katie g Brad Is Dictionary2 equal to Dictionary1? = False Does StringDictionary2 has key B? True