Count a Specific Character in a String in C# — Use Loops, LINQ, Case-Insensitive Count & Null Safety

Описание: 🎥 Count Specific Character in a String in C#
In this video, you’ll learn how to count how many times a specific character appears in a string using C#. We’ll cover simple loop-based counting, concise LINQ approaches, case-insensitive counting, and defensive handling for null or empty input. This practical tutorial is great for text processing, validation tasks, and building small utility functions that behave correctly on messy real-world input.
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Key Learning Points:
• Iterate the string and count matching characters safely with a loop
• Use LINQ (Count) for concise, readable solutions
• Implement case-insensitive counts (char.ToLower() or StringComparison) when needed
• Handle null/empty strings, Unicode characters, and trimming if required
• Return counts or boolean existence results and structure logic into a reusable helper method
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What You’ll Need:
Basic C# knowledge — strings, loops, LINQ (optional), and a .NET environment such as Visual Studio or VS Code to run and test examples.
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📚 Resources:
• string iteration and char handling in C# (Microsoft Docs)
• LINQ Count method for predicate-based aggregation
• char.ToLowerInvariant() / char.ToUpperInvariant() for culture-invariant comparisons
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