Why Are My Arrow Keys Unresponsive in the KeyDown Event, and How Can I Fix It?

Troubleshooting Unresponsive Arrow Keys in KeyDown Events

Applications handling window-level key input, especially those with disabled tab stops on focusable controls and KeyPreview set to true, might experience unresponsive arrow keys within the KeyDown event. This is because the KeyDown event behaves inconsistently: it's ignored for standalone arrow key presses but triggers when used with the Control key.

The PreviewKeyDown Event: A Reliable Alternative

The solution lies in using the PreviewKeyDown event. This event precedes KeyDown and allows for preemptive key behavior modification. By checking for arrow key presses within PreviewKeyDown and setting e.IsInputKey = true;, you ensure the KeyDown event fires reliably. This approach is cleaner and avoids the complexities of overriding ProcessCmdKey.

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