How do I get xml tag from cursor position in c# wpf textbox

Question

I have an XML text in the WPF textbox.

So for example, if the cursor is posited like this,

or like this

I want to get tag1 . And if the cursor is located in tag2 :

I get tag2 , and so on...

Answer 1

First, you need to define AcceptsReturn="True" in XAML, but I think you know that.

Then, you can use GetLineText method of TextBox in such way (I created dummy text box and event handler for purpose of presentation):

private void txb_KeyDown(object sender, KeyEventArgs e)
{
    // Handle event only if Q is pressed.
    if (e.Key != Key.Q) return;
    // Count how many newline characters there were, to determine index of current line.
    var lineIndex = txb.Text.Substring(0, txb.CaretIndex).Count(ch => ch == '\n');
    // Get current line.
    var currentLine = txb.GetLineText(lineIndex);
}