在 C# 中检查 SortedList 对象是否包含特定键?
csharpserver side programmingprogramming
在 C# 中检查 SortedList 对象是否包含特定键，代码如下 −
示例
using System;
using System.Collections;
public class Demo {
public static void Main() {
SortedList list = new SortedList ();
list.Add("A", "Books");
list.Add("B", "Electronics");
list.Add("C", "Appliances");
list.Add("D", "Pet Supplies");
list.Add("E", "Clothing");
list.Add("F", "Footwear");
Console.WriteLine("Value associated with key E = "+list["E"]);
list["E"] = "HDD";
Console.WriteLine("Value associated with key E [Updated] = "+list["E"]);
Console.Write("Does the list has key C? = "+list.Contains("C"));
}
}
输出
这将产生以下输出 −
Value associated with key E = Clothing Value associated with key E [Updated] = HDD Does the list has key C? = True
示例
现在让我们看另一个例子 −
using System;
using System.Collections;
public class Demo {
public static void Main(String[] args) {
SortedList sortedList = new SortedList();
sortedList.Add("A", "1");
sortedList.Add("B", "2");
sortedList.Add("C", "3");
sortedList.Add("D", "4");
sortedList.Add("E", "5");
sortedList.Add("F", "6");
sortedList.Add("G", "7");
sortedList.Add("H", "8");
sortedList.Add("I", "9");
sortedList.Add("J", "10");
Console.WriteLine("SortedList elements...");
foreach(DictionaryEntry d in sortedList) {
Console.WriteLine("Key = "+d.Key + ", Value = " + d.Value);
}
Console.WriteLine("Count of SortedList key-value pairs = "+sortedList.Count);
sortedList.RemoveAt(3);
Console.WriteLine("
Enumerator to iterate through the SortedList...");
IDictionaryEnumerator demoEnum = sortedList.GetEnumerator();
while (demoEnum.MoveNext())
Console.WriteLine("Key = " + demoEnum.Key + ", Value = "+ demoEnum.Value);
Console.WriteLine("Count of SortedList key-value pairs (Updated) = "+sortedList.Count);
Console.WriteLine("
Does the list has key C? = "+sortedList.Contains("C"));
Console.WriteLine("Does the list has key M? = "+sortedList.Contains("M"));
}
}
输出
这将产生以下输出 −
SortedList elements... Key = A, Value = 1 Key = B, Value = 2 Key = C, Value = 3 Key = D, Value = 4 Key = E, Value = 5 Key = F, Value = 6 Key = G, Value = 7 Key = H, Value = 8 Key = I, Value = 9 Key = J, Value = 10 Count of SortedList key-value pairs = 10 Enumerator to iterate through the SortedList... Key = A, Value = 1 Key = B, Value = 2 Key = C, Value = 3 Key = E, Value = 5 Key = F, Value = 6 Key = G, Value = 7 Key = H, Value = 8 Key = I, Value = 9 Key = J, Value = 10 Count of SortedList key-value pairs (Updated) = 9 Does the list has key C? = True Does the list has key M? = False
