WPF TextBox string Search, scrolling to the current line

1 //Execution Events2 Private voidButton_Click (Objectsender, RoutedEventArgs e)3         {4 5             if(Txtstr. Text = ="")6             {7MessageBox.Show ("the query string is empty! ");8                 return;9             }Ten cxtxt_string (); One         } A  - //Execution Method -         intindex =0;//Search starting from the No. 0 string the          Public voidcxtxt_string () -         { -             stringstr = TextBox1.Text;//set the string you want to find -index = textBox2.Text.IndexOf (str, index);//returns the index position of str in TextBox1 +             if(Index <0)//If no string is found, the return -             { +index =0; ATextbox2.selectionstart =0; atTextbox2.selectionlength =0; -MessageBox.Show ("has reached the end"); -                 return; -             } -Textbox2.selectionstart = index;//set where you want the selected string to start -Textbox2.selectionlength = str. Length;//set the end position of the string to be selected inindex++; -Textbox2.focus ();//Set Focus to  +             //int rows = Textbox2.getfirstvisiblelineindex ();//get the row index of the first character in a visible text box -             intline = Textbox2.getlineindexfromcharacterindex (index);//returns the line number where the specified string index is located the             //Debug.WriteLine (Rows + ",," + line); *             intLastLine =Textbox2.getlastvisiblelineindex (); $             if(Line >lastline)Panax Notoginseng             { -Textbox2.scrolltoline (lastline+1);//Scroll to the specified row index in the view the             } +         } A     } the}

WPF finds strings in a TextBox and scrolls automatically to the line where the string is located

WPF TextBox string Search, scrolling to the current line