Question

How can I insert text into a WPF textbox at caret position? What am I missing? In Win32 you could use CEdit::ReplaceSel().

It should work as if the Paste() command was invoked. But I want to avoid using the clipboard.

Answer 1

To simply insert text at the caret position:

textBox.Text = textBox.Text.Insert(textBox.CaretIndex, "<new text>");

To replace the selected text with new text:

textBox.SelectedText = "<new text>";

To scroll the textbox to the caret position:

int lineIndex = textBox.GetLineIndexFromCharacterIndex(textBox.CaretIndex);
textBox.ScrollToLine(lineIndex);