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exceptions

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2026-11-03 csharp dotnet attributes

What does [CallerArgumentExpression] capture, and how do I use it in my own guard methods?

[CallerArgumentExpression] makes the C# compiler pass the source text of an argument as a string. Verified on .NET 10 and C# 14: what exactly gets captured (whitespace, comments, parentheses, line breaks), when you get null instead, how to write NotNull, Positive and That guards, and the overload trap that silently disables it.

2026-10-29 comparison csharp dotnet

Try pattern vs throwing exceptions for expected failures in C#

Return bool from a TryX method when failure is an ordinary outcome the caller will branch on, and throw when it is a bug or a broken precondition. Measured on .NET 10.0.10: a failed int.TryParse costs 4.9 ns, a caught FormatException costs 2,487 ns.