1、RichTextBox 控件的應(yīng)用1界面設(shè)計1 個 RichTextBox，4 個按鈕 Button更改窗體的標題1更改 RichTextBox 的 Lines 屬性2更改按鈕的 Text 屬性342編寫相關(guān)代碼雙擊第 1 個按鈕編寫該按鈕單擊事件的處理代碼5雙擊第 2 個按鈕編寫該按鈕單擊事件的處理代碼6雙擊第 3 個按鈕編寫該按鈕單擊事件的處理代碼7雙擊第 4 個按鈕編寫該按鈕單擊事件的處理代碼代碼如下（粗體字才是需要輸入的代碼）8using System9using System.Collections.Generic usingponentM using System.Datausin

2、g System.Drawing using System.Textusing System.Windows.Formsnamespace WindowsApplication6public partial class Form1 : Formpublic Form1()ponent()private void button1_Click(objecder, EventArgs e)Font oldfont,newfontoldfont = this.richTextBox1.SelectionFontif (oldfont.Bold )newfont=new Font(oldfont,old

3、font.Style & FontStyold )else newfont=new Font(oldfont,oldfont.Style | FontStyold )this.richTextBox1.SelectionFont = newfontthis.richTextBox1.Focus()private void button2_Click(objecder, EventArgs e)Font oldfont,newfontoldfont = this.richTextBox1.SelectionFontif (oldfont.Underline)newfont=new Font(ol

4、dfont,oldfont.Style & FontStyle.Underline )elsenewfont = new Font(oldfont, oldfont.Style | FontStyle.Underline)this.richTextBox1.SelectionFont = newfontthis.richTextBox1.Focus()private void button3_Click(objecder, EventArgs e)3運行程序10private void button4_Click(objecder, EventArgs e)trythis.richTextBox1.LoadFile(richtextfile.rtf)catch (System.IO.FileLoadException )MessageBox.Show(沒有需要的文件類型)trythis.richTextBox1.SaveFile(richtextfile.rtf)catch (System.Exception err)MessageBox.Show(err.Message)選中 RichTextBox 中的文字按“粗體”按鈕11按“下劃線”按鈕按“保存”按鈕12在項目目錄的 debug 目錄中可發(fā)現(xiàn)程序生成的 rtf