在C＃中向RichTextBox添加字符串

我目前有一个函数将一个值设置为RichTextBox，虽然你怎么能“添加”一个值或一个新行，而不是覆盖RichTextBox中的现有数据？

richTextBox2.Text = DateTime.Today + " Hello"; 

Answer 1

 richTextBox2.AppendText(Environment.NewLine + DateTime.Today + " Hello"); 

Answer 2

 richTextBox2.AppendText(String.Format("{0} the date is {1}{2}", "Hello", DateTime.Today, Environment.NewLine)); 

请不要使用+

Answer 3

 richTextBox2.Document.Blocks.Clear(); richTextBox2.Document.Blocks.Add(new Paragraph(new Run("string"))); 

Answer 4

 richTextBox2.Text = "Something " + richTextBox2.Text + " and something"