How to search in C# array?

Question

Ravi Vishwakarma · Answer

Here we are discuss to search a text in the array.
Step 1: Create Student class with override 
ToString() in C#
using System.Reflection;
using System.Text;
namespace ConsoleApp1
{
    // Define the Student class
    public class Student
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public int Age { get; set; }
        public string Grade { get; set; }
        public float? Marks { get; set; }
        public string FatherName { get; set; }
        public override string ToString()
        {
            StringBuilder sb = new StringBuilder("");
            foreach (PropertyInfo property in this.GetType().GetProperties())
            {
                sb.AppendFormat("{0}: {1} ", property.Name, property.GetValue(this));
            }
            return sb.ToString();
        }
    }
}
Step 2: Create DisplayStudent method to display a student list on the console, Which is generic type display method.
public void DisplayStudentandlt;TArray>(TArray[] data)
        {
            // Print a separator line
            Console.WriteLine("-----------------------------------------------");
            // Print the total number of records
            Console.BackgroundColor = ConsoleColor.Red;
            Console.WriteLine("Total Records : " + (data != null ? data.Length : 0));
            Console.ResetColor();
            // Iterate through the data array and print each item
            foreach (var item in data)
            {
                Console.WriteLine(item);
            }
            // Print another separator line
            Console.WriteLine("-----------------------------------------------");
        }
Step 3: Create SearchStudents method to search the use query in the list of students, This method has one extra feature which is the
whole search.
public Student[] SearchStudents(string SearchQuery, bool IsApplyWholeSearch = false)
        {
            // List to store matching students
            IListandlt;Student> NewStudents = new Listandlt;Student>();
            if (students != null)
            {
                if (!IsApplyWholeSearch)
                {
                    // Iterate through the students array
                    foreach (Student item in this.students)
                    {
                        // Check if the student's name contains the search query (case-insensitive)
                        if (item.Name.Contains(SearchQuery, StringComparison.OrdinalIgnoreCase))
                        {
                            // Add matching student to the list
                            NewStudents.Add(item);
                        }
                    }
                }
                else
                {
                    // Iterate through the students array
                    foreach (Student item in this.students)
                    {
                        foreach (var property in item.GetType().GetProperties())
                        {
                            // // Get the value of the property, Check if the student fields contains the search query (case-insensitive)
                            if (property.GetValue(item).ToString().Contains(SearchQuery, StringComparison.OrdinalIgnoreCase))
                            {
                                // Add matching student to the list
                                NewStudents.Add(item);
                                break; // Break inner loop if a match is found
                            }
                        }
                    }
                }
            }
            // Convert the list to an array
            Student[] _students = new Student[NewStudents.Count];
            NewStudents.CopyTo(_students, 0);
            return _students;
        }
Step 4: Bind the whole code in one program.
using System;
using System.Collections.Generic;
namespace ConsoleApp1
{
    public class Program
    {
        // Create an array to hold 10 students
        Student[] students = new Student[10];
        public static void Main()
        {
            // Instantiate the Program class
            Program Program = new Program();
            // Initialize student data
            Program.InitlizeData();
            // Display all students initially
            Program.DisplayStudentandlt;Student>(Program.students);
            // Variable to hold user input
            string str = string.Empty;
            do
            {
                Console.WriteLine("Enter student name to search, or Press exit to close program.");
                // Read user input
                str = Console.ReadLine();
                // Check if the input is not empty or "exit"
                if (!string.IsNullOrEmpty(str) andand !str.Equals("exit", StringComparison.OrdinalIgnoreCase))
                {
                    // Display search results
                    Program.DisplayStudentandlt;Student>(Program.SearchStudents(str, true));
                }
                else
                {
                    // Exit the program if "exit" is entered
                    return;
                }
            } while (true);
            // Wait for the user to press a key before closing (not reached due to return above)
            Console.ReadLine();
        }
        public void InitlizeData()
        {
            // Populate the array with 10 student records
            students[0] = new Student { Id = 1, Name = "Alice Bob", Age = 20, Grade = "A", Marks = 950, FatherName = "Nich Alice" };
            students[1] = new Student { Id = 2, Name = "Bob Hank", Age = 21, Grade = "B", Marks = 250, FatherName = "John Martin" };
            students[2] = new Student { Id = 3, Name = "Charlie", Age = 22, Grade = "A", Marks = 50, FatherName = "Dash Can" };
            students[3] = new Student { Id = 4, Name = "David Eve", Age = 23, Grade = "C", Marks = 530, FatherName = "" };
            students[4] = new Student { Id = 5, Name = "Eve", Age = 20, Grade = "B", Marks = 150, FatherName = "Bob Charlie" };
            students[5] = new Student { Id = 6, Name = "Frank", Age = 21, Grade = "A", Marks = 510, FatherName = "Nich Alice" };
            students[6] = new Student { Id = 7, Name = "Eve Grace", Age = 22, Grade = "B", Marks = 50, FatherName = "Nich Frank" };
            students[7] = new Student { Id = 8, Name = "Hank", Age = 23, Grade = "C", Marks = 540, FatherName = "Nich Eve" };
            students[8] = new Student { Id = 9, Name = "Ivy", Age = 20, Grade = "A", Marks = 510, FatherName = "Hank Ivy" };
            students[9] = new Student { Id = 10, Name = "Jack Ma", Age = 21, Grade = "B", Marks = 520, FatherName = "Jack Alice" };
        }
        public Student[] SearchStudents(string SearchQuery, bool IsApplyWholeSearch = false)
        {
            // List to store matching students
            IListandlt;Student> NewStudents = new Listandlt;Student>();
            if (students != null)
            {
                if (!IsApplyWholeSearch)
                {
                    // Iterate through the students array
                    foreach (Student item in this.students)
                    {
                        // Check if the student's name contains the search query (case-insensitive)
                        if (item.Name.Contains(SearchQuery, StringComparison.OrdinalIgnoreCase))
                        {
                            // Add matching student to the list
                            NewStudents.Add(item);
                        }
                    }
                }
                else
                {
                    // Iterate through the students array
                    foreach (Student item in this.students)
                    {
                        foreach (var property in item.GetType().GetProperties())
                        {
                            // // Get the value of the property, Check if the student fields contains the search query (case-insensitive)
                            if (property.GetValue(item).ToString().Contains(SearchQuery, StringComparison.OrdinalIgnoreCase))
                            {
                                // Add matching student to the list
                                NewStudents.Add(item);
                                break; // Break inner loop if a match is found
                            }
                        }
                    }
                }
            }
            // Convert the list to an array
            Student[] _students = new Student[NewStudents.Count];
            NewStudents.CopyTo(_students, 0);
            return _students;
        }
        public void DisplayStudentandlt;TArray>(TArray[] data)
        {
            // Print a separator line
            Console.WriteLine("-----------------------------------------------");
            // Print the total number of records
            Console.BackgroundColor = ConsoleColor.Red;
            Console.WriteLine("Total Records : " + (data != null ? data.Length : 0));
            Console.ResetColor();
            // Iterate through the data array and print each item
            foreach (var item in data)
            {
                Console.WriteLine(item);
            }
            // Print another separator line
            Console.WriteLine("-----------------------------------------------");
        }
    }
}
Output:and 
and

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How to search in C# array?

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