C#-এ SortedList-এ নির্দিষ্ট কী আছে কিনা চেক করা

SortedList ক্লাসে নির্দিষ্ট কী আছে কিনা চেক করার জন্য Contains(key) মেথড ব্যবহার করা হয়। এটি কী অনুযায়ী সর্টেড রয়েছে।

উদাহরণ ১: Contains মেথড ব্যবহার

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"));
    }
}

আউটপুট

Value associated with key E = Clothing
Value associated with key E [Updated] = HDD
Does the list has key C? = True

উদাহরণ ২: ইটারেটর ও Contains চেক

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("\nEnumerator 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("\nDoes the list has key C? = " + sortedList.Contains("C"));
        Console.WriteLine("Does the list has key M? = " + sortedList.Contains("M"));
    }
}

আউটপুট

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

সারসংক্ষেপ

• Contains(key) — কী আছে কিনা বুলিয়ান রিটার্ন করে।
• ContainsKey ও ContainsValue মেথডও আছে (IDictionary ইন্টারফেস থেকে)।
• SortedList কী অনুযায়ী স্বয়ংক্রিয়ভাবে সর্টেড থাকে।