How to Register CTRL SHIFT (Letter) Global Hotkeys in WPF with .NET 3.5?

Register global hotkey (CTRL SHIFT (letter)) in WPF .NET 3.5 environment

When developing WPF applications using C#, you often need to bind specific keys to perform specific operations. This article provides a complete solution for registering global hotkeys, including CTRL SHIFT (letter) key combinations, in a .NET 3.5 environment.

The following code is a complete solution that can be run directly:

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

In the OnHotKeyHandler method you can define the action to be performed when the hotkey is pressed:

<code class="language-csharp">private void OnHotKeyHandler(HotKey hotKey)
{
    SystemHelper.SetScreenSaverRunning();
}</code>

The provided HotKey class handles the low-level details of registering and unregistering hotkeys. It contains Key, KeyModifiers, Action and Id attributes. The Register and Unregister methods are used to register and unregister hotkeys respectively.

The

ComponentDispatcherThreadFilterMessage method intercepts messages and checks for hotkey calls. When a hotkey is triggered, it invokes the corresponding action.

The

Dispose method ensures that resources are properly cleaned up when the HotKey object is no longer needed.

By following the provided code and instructions, you can easily register global hotkeys in your WPF application to provide users with custom keyboard shortcuts, thereby increasing efficiency.

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