RichTextBox C# Set caret location winforms

Question

I am building a chat application where the user enters its text to a richtextbox.

In the rich text box there is an initial text which says: "Me: ".

Now, when the user press the Home button I want the caret to be located after the "Me: " string. So for Shift+Home combination or for triple mouse click or for Ctrl + left cursor etc..

Any way it can be done?

I've already tried

[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool SetCaretPos(int X, int Y);

thanks in advance, Oz.

Answer 1

You can set the caret position with the SelectionStart and SelectionLength properties of the rich text box. Set SelectionLength to 0 and then set SelectionStart to the location where you want the caret to appear.

The documentation for SelectionStart says:

If no text is selected in the control, this property indicates the insertion point, or caret, for new text.

---

The Win32 API function SetCaretPos is much too low level for your needs.

Answer 2

Winforms: RichTextBox.SelectionStart & set RichTextBox.SelectionLength to 0.

WPF: RichTextBox.CaretPosition

Answer 3

Use the Select method:

public void Select(
    int start,
    int length
)

richTextBoxUserText.Select(richTextBoxUserText.TextLength, 0);

Answer 4

RichTextBox1.SelectionStart = Pos; RichTextBox1.SelectionLength = 0; RichTextBox1.ScrollToCaret();

Answer 5

Found it googling on the property SelectionProtected

richTextBoxUserText.Text = INITIAL_TEXT;
richTextBoxUserText.SelectAll();
richTextBoxUserText.SelectionColor = Color.Red;
richTextBoxUserText.SelectionProtected = true;
richTextBoxUserText.SelectionLength = 0;
richTextBoxUserText.SelectionStart = richTextBoxUserText.TextLength + 1;