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C# String Comparison

In C#, strings can be compared using various methods and operators, such as the == operator, the Equals() method, and the Compare() method. These methods allow you to check for equality or determine the relative order of strings.

Key Topics

1. Using the == Operator

Example: Equality Operator

string str1 = "Hello";
string str2 = "Hello";
Console.WriteLine(str1 == str2); // Outputs: True

2. Using the Equals() Method

Example: Equals Method

string str1 = "Hello";
string str2 = "hello";
bool isEqual = str1.Equals(str2);
Console.WriteLine(isEqual); // Outputs: False

3. Using the Compare() Method

The Compare() method returns an integer indicating the relative order of the strings.

Example: Compare Method

string str1 = "Apple";
string str2 = "Banana";
int result = string.Compare(str1, str2);
Console.WriteLine(result); // Outputs: -1

A result of -1 indicates that str1 precedes str2 in sort order.

4. The StringComparison Enum

You can specify comparison rules using the StringComparison enumeration.

Example: Case-Insensitive Comparison

string str1 = "hello";
string str2 = "HELLO";
bool isEqual = str1.Equals(str2, StringComparison.OrdinalIgnoreCase);
Console.WriteLine(isEqual); // Outputs: True

Key Takeaways

  • Use == for simple equality checks.
  • Equals() provides more options for comparison.
  • Compare() helps determine sort order between strings.
  • The StringComparison enum allows for culture-specific and case-insensitive comparisons.
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