Selection property not working

问题

string holder = richTextBox1.Selection.Text;

The .Selection produces an error :

'System.Windows.Forms.RichTextBox' does not contain a definition for 'Selection' and no extension method 'Selection' accepting a first argument of type 'System.Windows.Forms.RichTextBox' could be found (are you missing a using directive or an assembly reference?).

回答1:

A RichtTextBox doesn't have a Selection property, hence the error message.

It does have a SelectionStart and SelectionLength property, which you can use to get the selection text yourself:

string selectedText = rtb.Text.Substring(rtb.SelectionStart, rtb.Length);

Or simply use SelectedText

string selectedText = rtb.SelectedText;

来源：https://stackoverflow.com/questions/37521067/selection-property-not-working