How Can I Register Global Hotkeys (e.g., Ctrl Shift Letter) in WPF with .NET 3.5?

Global Hotkey Registration in WPF (.NET 3.5): CTRL SHIFT Letter Combinations

This solution demonstrates how to register global hotkeys, including combinations like CTRL SHIFT (LETTER) and Windows key combinations, within a WPF application using .NET 3.5.

Implementation:

Create a HotKey object, defining the desired key, modifiers (e.g., Ctrl, Shift, Win), and the event handler method. For example:

<code class="language-csharp">_hotKey = new HotKey(Key.F9, KeyModifier.Shift | KeyModifier.Win, OnHotKeyHandler);</code>

Event Handling:

The OnHotKeyHandler method (in the example above) executes when the registered hotkey (Shift Win F9) is pressed. Customize this method to perform your desired actions.

The HotKey Class:

This class manages the registration and unregistration of system-wide hotkeys using message filtering to capture keypress events.

Supported Modifiers:

The KeyModifier enumeration includes:

• Alt
• Ctrl
• NoRepeat (prevents repeated key events)
• Shift
• Win

Combine these modifiers to create complex hotkey combinations.

Key Features & Considerations:

• Thoroughly tested within a WPF environment.
• Id property uniquely identifies each registered hotkey.
• Register() method returns true for successful registration, false otherwise.
• Unregister() method releases the hotkey.
• Disposing of the HotKey object automatically unregisters the hotkey.

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