C#Winform使用扩展方法自定义富文本框(RichTextBox)字体颜色

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
 
namespace DocDetector.Core.Extensions
{
  public static class RichTextBoxExtension
  {
    public static void AppendTextColorful(this RichTextBox rtBox, string text, Color color, bool addNewLine = true)
    {
      if (addNewLine)
      {
        text += Environment.NewLine;
      }
      rtBox.SelectionStart = rtBox.TextLength;
      rtBox.SelectionLength = 0;
      rtBox.SelectionColor = color;
      rtBox.AppendText(text);
      rtBox.SelectionColor = rtBox.ForeColor;
    }
  }
}

rtxtLog.AppendTextColorful("Your message here",Color.Green);