Selective Catching with Exception Filter Expressions

Snippet

Selective Catching with Exception Filter Expressions

Exception filters (using the 'when' keyword) allow you to catch an exception only if a specific condition is met. This is cleaner than catching and re-throwing, and it preserves the original stack trace.

snippet.cs

csharp

try {
    PerformNetworkAction();
} catch (IOException ex) when (ex.Message.Contains("Timeout")) {
    Console.WriteLine("Retry necessary due to timeout.");
}

Breakdown

when (ex.Message.Contains("Timeout"))

The catch block only executes if this boolean expression returns true.

catch (IOException ex)

Specifies the base exception type to filter against.

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Selective Catching with Exception Filter Expressions

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