Case-Insensitive String Comparison in C#?

Case-Insensitive String Comparison in C#?

In C#, you can perform a case-insensitive string comparison in several ways:

  • Use the String.Compare method with the StringComparison.OrdinalIgnoreCase option:
string str1 = "Hello"; string str2 = "hElLo"; if (String.Compare(str1, str2, StringComparison.OrdinalIgnoreCase) == 0) { Console.WriteLine("The two strings are equal."); } else { Console.WriteLine("The two strings are not equal."); }
  • Use the String.Equals method with the StringComparison.OrdinalIgnoreCase option:
string str1 = "Hello"; string str2 = "hElLo"; if (String.Equals(str1, str2, StringComparison.OrdinalIgnoreCase)) { Console.WriteLine("The two strings are equal."); } else { Console.WriteLine("The two strings are not equal."); }
  • Use the ToLower or ToUpper methods to convert both strings to the same case before comparing them:
string str1 = "Hello"; string str2 = "hElLo"; if (str1.ToLower() == str2.ToLower()) { Console.WriteLine("The two strings are equal."); } else { Console.WriteLine("The two strings are not equal."); }

Note that the first two methods are generally more efficient than the third method, especially for large strings, as they avoid creating new string objects.

Examples

  1. "C# case-insensitive string comparison example"

    string str1 = "Hello"; string str2 = "hello"; bool areEqual = string.Equals(str1, str2, StringComparison.OrdinalIgnoreCase); Console.WriteLine($"Are strings equal? {areEqual}");

    Description: Demonstrates the use of StringComparison.OrdinalIgnoreCase for case-insensitive comparison.

  2. "C# compare strings without case sensitivity"

    string text1 = "OpenAI"; string text2 = "openai"; bool isEqual = text1.Equals(text2, StringComparison.CurrentCultureIgnoreCase); Console.WriteLine($"Are texts equal? {isEqual}");

    Description: Illustrates case-insensitive comparison using StringComparison.CurrentCultureIgnoreCase.

  3. "IgnoreCase in C# string comparison"

    string phrase1 = "DotNet"; string phrase2 = "dotnet"; bool samePhrase = phrase1.Equals(phrase2, StringComparison.InvariantCultureIgnoreCase); Console.WriteLine($"Are phrases the same? {samePhrase}");

    Description: Showcases case-insensitive comparison with StringComparison.InvariantCultureIgnoreCase.

  4. "C# StringComparison options for case-insensitive"

    string word1 = "Programming"; string word2 = "programming"; bool match = string.Compare(word1, word2, StringComparison.OrdinalIgnoreCase) == 0; Console.WriteLine($"Do words match? {match}");

    Description: Describes various StringComparison options, highlighting StringComparison.OrdinalIgnoreCase.

  5. "C# case-insensitive string comparison performance"

    string textA = "Performance"; string textB = "performance"; bool isSimilar = textA.Equals(textB, StringComparison.OrdinalIgnoreCase); Console.WriteLine($"Are texts similar? {isSimilar}");

    Description: Discusses the performance considerations of using case-insensitive string comparison in C#.

  6. "C# StringComparison.CurrentCultureIgnoreCase example"

    string sentence1 = "CSharp"; string sentence2 = "csharp"; bool equalSentences = string.Compare(sentence1, sentence2, StringComparison.CurrentCultureIgnoreCase) == 0; Console.WriteLine($"Are sentences equal? {equalSentences}");

    Description: Offers an example utilizing StringComparison.CurrentCultureIgnoreCase for case-insensitive comparison.

  7. "C# case-insensitive StringComparison in LINQ"

    List<string> items = new List<string> { "Apple", "banana", "Orange" }; string searchItem = "orange"; var foundItem = items.FirstOrDefault(item => item.Equals(searchItem, StringComparison.OrdinalIgnoreCase)); Console.WriteLine($"Found item: {foundItem}");

    Description: Demonstrates case-insensitive comparison in LINQ using StringComparison.OrdinalIgnoreCase.

  8. "C# case-insensitive StringComparison in SQL queries"

    string userInput = "SQL Query"; var result = db.Items.Where(item => item.Description.Equals(userInput, StringComparison.OrdinalIgnoreCase)).ToList();

    Description: Shows how to use case-insensitive comparison in SQL queries with StringComparison.OrdinalIgnoreCase.

  9. "C# StringComparison.InvariantCultureIgnoreCase vs OrdinalIgnoreCase"

    string textX = "Test"; string textY = "test"; bool isEqualOrdinal = textX.Equals(textY, StringComparison.OrdinalIgnoreCase); bool isEqualInvariant = textX.Equals(textY, StringComparison.InvariantCultureIgnoreCase); Console.WriteLine($"Ordinal Equal: {isEqualOrdinal}, Invariant Equal: {isEqualInvariant}");

    Description: Compares the usage of StringComparison.OrdinalIgnoreCase and StringComparison.InvariantCultureIgnoreCase.

  10. "C# StringComparison.OrdinalIgnoreCase best practices"

    string str3 = "BestPractices"; string str4 = "bestpractices"; bool matchBest = string.Compare(str3, str4, StringComparison.OrdinalIgnoreCase) == 0; Console.WriteLine($"Best practices match: {matchBest}");

    Description: Provides best practices and tips for using StringComparison.OrdinalIgnoreCase in C# for case-insensitive string comparison.

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