C# में ऐरे में foreach लूप का उपयोग

आइए ऐरे में foreach लूप के उपयोग का उदाहरण देखें।

उदाहरण 1: बेसिक foreach लूप

using System;

public class Demo {
    public static void Main() {
        string[] products = new string[] { "Electronics", "Accessories", "Clothing", "Toys", "Clothing", "Furniture" };
        
        Console.WriteLine("Products list...");
        foreach (string s in products) {
            Console.WriteLine(s);
        }
        
        // Array.Exists के साथ खोज
        Console.WriteLine("Is the products Accessories in the array? = {0}", 
            Array.Exists(products, ele => ele == "Accessories"));
        Console.WriteLine("Is the products Stationery in the array? = {0}", 
            Array.Exists(products, ele => ele == "Stationery"));
        
        // StartsWith के साथ पैटर्न खोज
        Console.WriteLine("\nOne or more products begin with 'C'? = {0}", 
            Array.Exists(products, ele => ele.StartsWith("C")));
        Console.WriteLine("One or more products begin with 'D'? = {0}", 
            Array.Exists(products, ele => ele.StartsWith("D")));
        Console.WriteLine("One or more products begin with 'T'? = {0}", 
            Array.Exists(products, ele => ele.StartsWith("T")));
        Console.WriteLine("One or more products begin with 'E'? = {0}", 
            Array.Exists(products, ele => ele.StartsWith("E")));
        
        // ऐरे गुण
        Console.WriteLine("Is the array having fixed size? = " + products.IsFixedSize);
    }
}

आउटपुट

Products list...
Electronics
Accessories
Clothing
Toys
Clothing
Furniture
Is the products Accessories in the array? = True
Is the products Stationery in the array? = False
One or more products begin with 'C'? = True
One or more products begin with 'D'? = False
One or more products begin with 'T'? = True
One or more products begin with 'E'? = True
Is the array having fixed size? = True

उदाहरण 2: दो ऐरे की तुलना

using System;

public class Demo {
    public static void Main() {
        String[] strArr1 = new String[3] { "John", "Jacob", "Tim" };
        String[] strArr2 = new String[3] { "Tom", "Brad", "Bradley" };
        
        Console.WriteLine("First String array...");
        foreach (string val in strArr1) {
            Console.WriteLine(val);
        }
        
        Console.WriteLine("Second String array...");
        foreach (string val in strArr2) {
            Console.WriteLine(val);
        }
        
        Console.WriteLine("Are both the array objects equal? = " + strArr1.Equals(strArr2));
    }
}

आउटपुट

First String array...
John
Jacob
Tim
Second String array...
Tom
Brad
Bradley
Are both the array objects equal? = False

महत्वपूर्ण बिंदु

• foreach केवल पढ़ने के लिए है - लूप वेरिएबल को असाइन नहीं कर सकते
• Array.Exists प्रेडिकेट के आधार पर एलिमेंट खोजता है
• StartsWith स्ट्रिंग प्रीफिक्स मिलान के लिए उपयोगी
• IsFixedSize ऐरे हमेशा true लौटाता है (C# में ऐरे फिक्स्ड साइज़ होते हैं)
• Equals रेफरेंस समानता जांचता है, कंटेंट समानता नहीं

कंटेंट समानता के लिए

// SequenceEqual एक्सटेंशन मेथड (System.Linq आवश्यक)
bool contentEqual = strArr1.SequenceEqual(strArr2);  // False

// या मैन्युअल तुलना
bool equal = strArr1.Length == strArr2.Length && 
             strArr1.Zip(strArr2, (a, b) => a == b).All(x => x);