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string bookname = "1989: Bob Dylan Didn't Have This to Sing about";
string aa = bookname.Replace("'", "\\'");
richTextBox2.Text = aa;
/*------输出-------
1989: Bob Dylan Didn\'t Have This to Sing about
*/
string bookname = "1989: Bob Dylan Didn't Have This to Sing about";
Console.WriteLine(bookname.Replace("'", "\\'"));
Console.ReadLine();