RichTextBox控件應用

:

 public partial class RichTextBox : Form
    ...{
        public RichTextBox()
        ...{
            InitializeComponent();
            txtSize.KeyPress += new KeyPressEventHandler(txtSize_KeyPress);
            txtSize.Validating += new CancelEventHandler(txtSize_Validating);
            rtpText.LinkClicked += new LinkClickedEventHandler(rtpText_LinkClicked);
        }

        void rtpText_LinkClicked(object sender, LinkClickedEventArgs e)
        ...{
            System.Diagnostics.Process.Start(e.LinkText);
        }

        void txtSize_Validating(object sender, CancelEventArgs e)
        ...{
= (TextBox)sender;
            ApplyTextSize(txt.Text);
            rtpText.Focus();
        }

        void txtSize_KeyPress(object sender, KeyPressEventArgs e)
        ...{
            if ((e.KeyChar < 48 || e.KeyChar > 57) && e.KeyChar != 8 && e.KeyChar != 13)
            ...{
                e.Handled = true;
            }
            else if (e.KeyChar == 13)
            ...{
                TextBox txt = (TextBox)sender;
                if (txt.Text.Length > 0)
                    ApplyTextSize(txt.Text);
                e.Handled = true;
                rtpText.Focus();
            }
        }
        void ApplyTextSize(string txt)
        ...{
            if (txtSize.Text.Trim().Length > 0)
            ...{
                float newSize = Convert.ToSingle(txtSize.Text.Trim());
                FontFamily currentFontFamily;
                Font newFont;
                currentFontFamily = rtpText.SelectionFont.FontFamily;
                newFont = new Font(currentFontFamily, newSize);
                rtpText.SelectionFont = newFont;
            }
        }
        private void btnBold_Click(object sender, EventArgs e)
        ...{
            try
                Font oldFont;
                Font newFont;
                oldFont = rtpText.SelectionFont;
                if (oldFont.Bold == true)
                    newFont = new Font(oldFont, oldFont.Style & ~FontStyle.Bold);
                else newFont = new Font(oldFont, oldFont.Style | FontStyle.Bold);
                rtpText.SelectionFont = newFont;
                this.rtpText.Focus();
            }
            catch (Exception ex)
            ...{
                MessageBox.Show(ex.ToString());
            }
        }

        private void btnItalic_Click(object sender, EventArgs e)
        ...{
            Font oldFont;
            Font newFont;
            oldFont = rtpText.SelectionFont;
.Italic == true)
                newFont = new Font(oldFont, oldFont.Style & ~FontStyle.Italic);
            else newFont = new Font(oldFont, oldFont.Style | FontStyle.Italic);
            rtpText.SelectionFont = newFont;
            this.rtpText.Focus();
        }

        private void btnUnderline_Click(object sender, EventArgs e)
        ...{
            Font oldFont;
            Font newFont;
            oldFont = rtpText.SelectionFont;
            if (oldFont.Underline == true)
                newFont = new Font(oldFont, oldFont.Style & ~FontStyle.Underline);
            else newFont = new Font(oldFont, oldFont.Style | FontStyle.Underline);
            rtpText.SelectionFont = newFont;
            this.rtpText.Focus();
        }

        private void btnCenter_Click(object sender, EventArgs e)
        ...{
            if (this.rtpText.SelectionAlignment == HorizontalAlignment.Center)
                rtpText.SelectionAlignment = HorizontalAlignment.Left;
            else rtpText.SelectionAlignment = HorizontalAlignment.Center;
            rtpText.Focus();
        }

        private void btnSave_Click(object sender, EventArgs e)
        ...{
            //string FilePath = Application.StartupPath + @"Test.rtf";
            //bool exist = File.Exists(FilePath);
            //if (exist == false)
            //{
            //    Directory.CreateDirectory(Application.StartupPath);
            //    FileStream fs = new FileStream(FilePath, FileMode.Create);
            //    fs.Close();
            //}
            try
            ...{
                rtpText.SaveFile("../../Test.rtf");
            }
            catch (Exception err)

                MessageBox.Show(err.Message);
            }
        }

        private void btnLoad_Click(object sender, EventArgs e)
        ...{
            try
            ...{
                rtpText.LoadFile("../../Test.rtf");
            }
            catch (System.IO.FileNotFoundException)
            ...{
                MessageBox.Show("沒找到相關文件");
            }
        }
        private void btnStart_Click(object sender, EventArgs e)
            System.Diagnostics.Process.Start(Application.StartupPath + @"垃圾清理.bat");
        }
    }

 運行效果圖: