C# RichTextBox制作文本编辑器

页面代码【由于实现了代码封装，所有页面代码较少】

using DemoRichText.Model;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace DemoRichText
{
 public partial class MainForm : Form
 {
  public MainForm()
  {
   InitializeComponent();
  }
  

  public void btnButtonClick(object sender, EventArgs e) {
   Button btn = (Button)sender;
   BTNType btnType;
   if (Enum.TryParse<BTNType>(btn.Tag.ToString(), out btnType)) {
    if (btnType == BTNType.Search) {
     if (!string.IsNullOrEmpty(this.txtSearch.Text.Trim()))
     {
      this.rtbInfo.Tag = this.txtSearch.Text.Trim();
     }
     else {
      return;
     }
     
    }
    IRichFormat richFomat = RichFormatFactory.CreateRichFormat(btnType);
    richFomat.SetFormat(this.rtbInfo);
   }
  }

  private void combFontSize_SelectedIndexChanged(object sender, EventArgs e)
  {
   float fsize = 12.0f;
   if (combFontSize.SelectedIndex > -1) {
    if (float.TryParse(combFontSize.SelectedItem.ToString(), out fsize)) {
     rtbInfo.Tag = fsize.ToString();
     IRichFormat richFomat = RichFormatFactory.CreateRichFormat(BTNType.FontSize);
     richFomat.SetFormat(this.rtbInfo);
    }
    return;
   }
  }
 }
}