C#-এ foreach লুপ অ্যারে বা কালেকশনের প্রতিটি এলিমেন্টের মাধ্যমে সহজে ইটারেট করতে সাহায্য করে। এটি ইনডেক্স ম্যানেজ করার প্রয়োজন নেই।
উদাহরণ ১: স্ট্রিং অ্যারে ইটারেট ও Array.Exists
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);
}
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"));
Console.WriteLine("\nOne or more products begin with the letter 'C'? = {0}", Array.Exists(products, ele => ele.StartsWith("C")));
Console.WriteLine("One or more planets begin with 'D'? = {0}", Array.Exists(products, ele => ele.StartsWith("D")));
Console.WriteLine("One or more products begin with the letter 'T'? = {0}", Array.Exists(products, ele => ele.StartsWith("T")));
Console.WriteLine("One or more planets begin with 'E'? = {0}", Array.Exists(products, ele => ele.StartsWith("E")));
Console.WriteLine("Is the array having fixed size? = " + products.IsFixedSize);
}
}
আউটপুট
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 the letter 'C'? = True One or more planets begin with 'D'? = False One or more products begin with the letter 'T'? = True One or more planets begin with 'E'? = True Is the array having fixed size? = True
উদাহরণ ২: দুটি অ্যারে তুলনা
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));
}
}
আউটপুট
First String array... John Jacob Tim Second String array... Tom Brad Bradley Are both the array objects equal? = False
সারসংক্ষেপ
foreach— রিড-অনলি ইটারেশন, মডিফাই করা যায় না।Array.Exists(array, predicate)— শর্ত মেনে এলিমেন্ট আছে কিনা চেক করে।IsFixedSize— অ্যারে সবসময় ফিক্সড সাইজ (true)।Equals— রেফারেন্স সমতা চেক করে, কন্টেন্ট নয়।
