C#: Determine whether a string ends with a particular substring

Last update on August 25 2025 12:50:27 (UTC/GMT +8 hours)

Write a C# Sharp program to determine whether a string ends with a particular substring.
The results are affected by the choice of culture, whether case is ignored, and whether an ordinal comparison is performed.

Sample Solution:-

C# Sharp Code:

using System;
using System.Threading;

class Example43 
{
    public static void Main() 
    {
        // Define the input string for the demonstration
        string str = "Determine whether a string ends with another string, " +
                   "using\n  different values of StringComparison.";

        // Define the StringComparison values to test
        StringComparison[] scValues = {
            StringComparison.CurrentCulture,
            StringComparison.CurrentCultureIgnoreCase,
            StringComparison.InvariantCulture,
            StringComparison.InvariantCultureIgnoreCase,
            StringComparison.Ordinal,
            StringComparison.OrdinalIgnoreCase };

        // Clear the console and display the initial string
        Console.Clear();
        Console.WriteLine(str);

        // Display the current culture to emphasize its effect on comparison
        Console.WriteLine("The current culture is {0}.\n", 
                           Thread.CurrentThread.CurrentCulture.Name);

        // Determine whether different string comparison methods result in strings ending
        foreach (StringComparison sc in scValues)
        {
            Console.WriteLine("StringComparison.{0}:", sc);
            Test("xyzPQR", "PQR", sc); // Test if the first string ends with the second string
            Test("xyzPQR", "PQR", sc); // Test if the first string ends with the second string
            Console.WriteLine();
        }
    }

    // Method to perform the string comparison test
    protected static void Test(string x, string y, StringComparison comparison)
    {
        string resultFmt = "\"{0}\" {1} with \"{2}\".";
        string result = "does not end";

        // Check if the first string ends with the second string using the specified comparison
        if (x.EndsWith(y, comparison))
            result = "ends";

        // Display the result of the comparison
        Console.WriteLine(resultFmt, x, result, y);
    }
}

Sample Output:

StringComparison.CurrentCultureIgnoreCase:                                                                    
"xyzPQR" ends with "PQR".                                                                                     
"xyzPQR" ends with "PQR".                                                                                     
                                                                                                              
StringComparison.InvariantCulture:                                                                            
"xyzPQR" ends with "PQR".                                                                                     
"xyzPQR" ends with "PQR".                                                                                     
                                                                                                              
StringComparison.InvariantCultureIgnoreCase:                                                                  
"xyzPQR" ends with "PQR".                                                                                     
"xyzPQR" ends with "PQR".                                                                                     
                                                                                                              
StringComparison.Ordinal:                                                                                     
"xyzPQR" ends with "PQR".                                                                                     
"xyzPQR" ends with "PQR".                                                                                     
                                                                                                              
StringComparison.OrdinalIgnoreCase:                                                                           
"xyzPQR" ends with "PQR".                                                                                     
"xyzPQR" ends with "PQR".

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