C Sharp (C#) - Strings and StringBuilder
You have a list of strings and want to remove duplicates ignoring case. Which LINQ expression correctly does this?
You have a list of strings and want to remove duplicates ignoring case. Which LINQ expression correctly does this?
hard🚀 Application Q9 of 15
Step-by-Step Solution
Solution:
Step 1: Understand Distinct with custom comparer
Distinct accepts StringComparer.OrdinalIgnoreCase to ignore case when removing duplicates.Step 2: Analyze other options
list.Distinct() is case-sensitive. list.GroupBy(s => s.ToLower()).Select(g => g.First()) works but creates new strings and is less efficient. list.Where(s => s != null).Distinct() ignores null but not case.Final Answer:
list.Distinct(StringComparer.OrdinalIgnoreCase) -> Option BQuick Check:
Use Distinct with OrdinalIgnoreCase to ignore case in duplicates [OK]
Quick Trick: Use Distinct with StringComparer.OrdinalIgnoreCase for case-insensitive duplicates [OK]
Common Mistakes:
MISTAKES- Using Distinct without comparer
- Lowercasing strings manually in GroupBy
- Ignoring null values without case handling
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