10 lines
609 B
Markdown
10 lines
609 B
Markdown
# Extensions
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String, DateTime, and lock utility extensions.
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## Key Files
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- **`StringExtensions.cs`** — `IsNullOrEmpty()`, `IsNullOrWhiteSpace()` (with `[NotNullWhen]`), `FirstLetterToUpper()`, `MixCharacters()` (interleaves two char sequences: ABC+DEF→ADBECF).
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- **`DateTimeExtension.cs`** — `IsNullOrEmpty()` for `DateTime`/`DateTime?`, `IsEqualSqlDateTime2()` for SQL Server datetime2 precision comparison.
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- **`LockExtensions.cs`** — `using` pattern for locks: `mutex.UseWaitOne()`, `semaphore.UseWait()`, `semaphore.UseWaitAsync()`. Returns `IDisposable` wrappers that auto-release on dispose.
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