How Can I Programmatically Generate Keypress and TextInput Events in C# WPF?

Programmatically generate key events in C#

Simulating key events in C# can be achieved through a variety of techniques. Here's a detailed way to use the WPF framework:

WPF Solution

To simulate a key press on a specific WPF element, such as pressing the Insert key on the currently focused element:

<code class="language-csharp">var key = Key.Insert;                    // 要发送的键
var target = Keyboard.FocusedElement;    // 目标元素
var routedEvent = Keyboard.KeyDownEvent; // 要发送的事件
target.RaiseEvent(
  new KeyEventArgs(
    Keyboard.PrimaryDevice,
    PresentationSource.FromVisual(target),
    0,
    key)
  { RoutedEvent = routedEvent }
);</code>

This solution raises the KeyDown event directly to the target, bypassing meta-processing.

Text input simulation

To simulate a TextInput event, use the following code:

<code class="language-csharp">var text = "Hello";
var target = Keyboard.FocusedElement;
var routedEvent = TextCompositionManager.TextInputEvent;

target.RaiseEvent(
  new TextCompositionEventArgs(
    InputManager.Current.PrimaryKeyboardDevice,
    new TextComposition(InputManager.Current, target, text))
  { RoutedEvent = routedEvent }
);</code>

Notes

• Preview events (e.g. PreviewKeyDown) should precede standard events (e.g. KeyDown).
• Raising events directly to the target bypasses meta-processing unless InputManager.ProcessInput() is used.
• Simulated key events will only behave like actual keyboard keys when handled via InputManager.ProcessInput().

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