GetHashCode() for OrdinalIgnoreCase-dependent string classes in C#

GetHashCode() for OrdinalIgnoreCase-dependent string classes in C#

When implementing GetHashCode() for string classes that are dependent on OrdinalIgnoreCase, you can use the StringComparer.OrdinalIgnoreCase property to get a comparer that performs a case-insensitive comparison using ordinal sort rules.

Here's an example of how to implement GetHashCode() for an OrdinalIgnoreCase-dependent string class:

public class OrdinalIgnoreCaseString : IEquatable<OrdinalIgnoreCaseString> { private readonly string value; public OrdinalIgnoreCaseString(string value) { this.value = value; } public bool Equals(OrdinalIgnoreCaseString other) { if (ReferenceEquals(null, other)) return false; if (ReferenceEquals(this, other)) return true; return string.Equals(value, other.value, StringComparison.OrdinalIgnoreCase); } public override bool Equals(object obj) { if (ReferenceEquals(null, obj)) return false; if (ReferenceEquals(this, obj)) return true; if (obj.GetType() != this.GetType()) return false; return Equals((OrdinalIgnoreCaseString) obj); } public override int GetHashCode() { return StringComparer.OrdinalIgnoreCase.GetHashCode(value); } public static bool operator ==(OrdinalIgnoreCaseString left, OrdinalIgnoreCaseString right) { return Equals(left, right); } public static bool operator !=(OrdinalIgnoreCaseString left, OrdinalIgnoreCaseString right) { return !Equals(left, right); } }

In this example, we define an OrdinalIgnoreCaseString class that wraps a string value and provides case-insensitive comparison using ordinal sort rules. We implement the IEquatable<T> interface and override the Equals(object) and GetHashCode() methods to perform case-insensitive comparison and generate a hash code using StringComparer.OrdinalIgnoreCase.GetHashCode(). We also overload the == and != operators to provide syntactic sugar for equality comparison.

With this implementation, you can use the OrdinalIgnoreCaseString class in your code and rely on its case-insensitive comparison and hash code generation.

Examples

  1. "C# GetHashCode for OrdinalIgnoreCase string comparison using GetHashCode() method":

    • Description: A general query seeking code to implement GetHashCode for string classes with OrdinalIgnoreCase comparison.
    public class OrdinalIgnoreCaseString { private readonly string value; public OrdinalIgnoreCaseString(string value) { this.value = value; } public override int GetHashCode() { return StringComparer.OrdinalIgnoreCase.GetHashCode(value); } }

  2. "C# GetHashCode for case-insensitive comparison using StringComparer.OrdinalIgnoreCase":

    • Description: Searches for code using StringComparer.OrdinalIgnoreCase for case-insensitive GetHashCode implementation.
    public class CaseInsensitiveString { private readonly string value; public CaseInsensitiveString(string value) { this.value = value; } public override int GetHashCode() { return StringComparer.OrdinalIgnoreCase.GetHashCode(value); } }

  3. "C# GetHashCode for OrdinalIgnoreCase using custom comparer":

    • Description: A query looking for code that utilizes a custom comparer for GetHashCode with OrdinalIgnoreCase comparison.
    public class CustomOrdinalIgnoreCaseString { private readonly string value; public CustomOrdinalIgnoreCaseString(string value) { this.value = value; } public override int GetHashCode() { return new OrdinalIgnoreCaseComparer().GetHashCode(value); } } public class OrdinalIgnoreCaseComparer : StringComparer { public override int Compare(string x, string y) { return string.Compare(x, y, StringComparison.OrdinalIgnoreCase); } public override bool Equals(string x, string y) { return string.Equals(x, y, StringComparison.OrdinalIgnoreCase); } public override int GetHashCode(string obj) { return obj?.ToLowerInvariant().GetHashCode() ?? 0; } }

  4. "C# GetHashCode for OrdinalIgnoreCase with fallback to InvariantCulture":

    • Description: Searches for code implementing GetHashCode with OrdinalIgnoreCase and fallback to InvariantCulture comparison.
    public class OrdinalIgnoreCaseFallbackString { private readonly string value; public OrdinalIgnoreCaseFallbackString(string value) { this.value = value; } public override int GetHashCode() { return StringComparer.OrdinalIgnoreCase.GetHashCode(value) ?? StringComparer.InvariantCulture.GetHashCode(value); } }

  5. "C# GetHashCode for case-insensitive comparison using StringComparer.CurrentCultureIgnoreCase":

    • Description: A query looking for code that uses StringComparer.CurrentCultureIgnoreCase for case-insensitive GetHashCode implementation.
    public class CurrentCultureCaseInsensitiveString { private readonly string value; public CurrentCultureCaseInsensitiveString(string value) { this.value = value; } public override int GetHashCode() { return StringComparer.CurrentCultureIgnoreCase.GetHashCode(value); } }

  6. "C# GetHashCode for OrdinalIgnoreCase with null handling":

    • Description: Searches for code implementing GetHashCode for OrdinalIgnoreCase comparison with proper null handling.
    public class SafeOrdinalIgnoreCaseString { private readonly string value; public SafeOrdinalIgnoreCaseString(string value) { this.value = value; } public override int GetHashCode() { return StringComparer.OrdinalIgnoreCase.GetHashCode(value ?? string.Empty); } }

  7. "C# GetHashCode for OrdinalIgnoreCase with culture-specific comparison":

    • Description: A query looking for code to implement GetHashCode for OrdinalIgnoreCase with culture-specific comparison.
    public class CultureSpecificOrdinalIgnoreCaseString { private readonly string value; public CultureSpecificOrdinalIgnoreCaseString(string value) { this.value = value; } public override int GetHashCode() { return StringComparer.Create(new CultureInfo("en-US"), ignoreCase: true).GetHashCode(value); } }

  8. "C# GetHashCode for case-insensitive comparison with null handling":

    • Description: Searches for code implementing GetHashCode for case-insensitive comparison with proper null handling.
    public class SafeCaseInsensitiveString { private readonly string value; public SafeCaseInsensitiveString(string value) { this.value = value; } public override int GetHashCode() { return StringComparer.OrdinalIgnoreCase.GetHashCode(value ?? string.Empty); } }

  9. "C# GetHashCode for OrdinalIgnoreCase with custom null value handling":

    • Description: A query looking for code that implements GetHashCode for OrdinalIgnoreCase with a custom approach to null value handling.
    public class CustomNullHandlingOrdinalIgnoreCaseString { private readonly string value; public CustomNullHandlingOrdinalIgnoreCaseString(string value) { this.value = value; } public override int GetHashCode() { return value?.ToLowerInvariant().GetHashCode() ?? 0; } }

  10. "C# GetHashCode for OrdinalIgnoreCase using ReadOnlyMemory<char>":

    • Description: Searches for code implementing GetHashCode for OrdinalIgnoreCase comparison using ReadOnlyMemory<char>.
    public class ReadOnlyMemoryOrdinalIgnoreCaseString { private readonly string value; public ReadOnlyMemoryOrdinalIgnoreCaseString(string value) { this.value = value; } public override int GetHashCode() { return StringComparer.OrdinalIgnoreCase.GetHashCode(value.AsMemory()); } }

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