Wpf displays rich text html, how to add font package to WPF rich text editor, etc.

I used WPF to write a rich text editor, but there are two problems that cannot be solved, I hope you can give pointers!

1. The front-end code of textEditor.xaml is as follows:

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"

xmlns:d="http://schemas.microsoft.com/expression/blend/2008"

xmlns:ribbon="clr-namespace:Microsoft.Windows.Controls.Ribbon;assembly=RibbonControlsLibrary"

xmlns:fluent="clr-namespace:Fluent;assembly=Fluent"

xmlns:extwpftoolkit="http://schemas.microsoft.com/winfx/2006/xaml/presentation/toolkit/extended"

mc:Ignorable="d" d:DesignHeight="730" d:DesignWidth="1354"

HorizontalAlignment="Left" VerticalAlignment="Top">

SmallImageSource="ico/Notepad.png"

LargeImageSource="ico/Notepad.png"

ToolTipTitle="WPF4 Notepad"

ToolTipDescription="Notepad Application with Ribbon Sample" />

LabelTitle="font"

CanExecute="FontStyleCommand_CanExecute"

Executed="FontStyleCommand_Executed"

ToolTipTitle="FontStyle"

ToolTipDescription="FontStyle selected contents"

/>

Command="{StaticResource FontColorCommand}">

CanExecute="FontColorComboBox_CanExecute"

Executed="FontColorComboBox_Executed"

ToolTipTitle="FontColor"

ToolTipDescription="FontColor selected contents" />

2.textEditor.xaml.cs background code:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Data;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Imaging;

using System.Windows.Navigation;

using System.Windows.Shapes;

///引入控件

///using Xceed.Wpf.Toolkit;

using Microsoft.Windows.Controls.Ribbon;

using Fluent;

using Microsoft.WindowsAPICodePack.Dialogs;

using Microsoft.WindowsAPICodePack.Shell;

using Microsoft.Win32;

using System.IO;

using System.Reflection;

using System.Xml.Linq;

using System.Resources;

using System.Windows.Resources;

using System.Threading;

using System.Windows.Controls.Primitives;

namespace Shanzhizi.Controls.TextEditor

{

///

/// textEditorControl.xaml 的交互逻辑

///

public partial class textEditor : UserControl

{

public textEditor()

{

InitializeComponent();

#region 加载字体颜色

fontColorComboBox();

#endregion 加载字体颜色

}

#region RibbonTab

#region RibbonTab 开始

#region RibbonTab 开始 字体

private void FontStyleCommand_CanExecute(object sender, CanExecuteRoutedEventArgs e)

{

}

private void FontStyleCommand_Executed(object sender, ExecutedRoutedEventArgs e)

{

}

#region  RibbonTab 字体 设置颜色

public void fontColorComboBox()

{

PropertyInfo[] props = typeof(Colors).GetProperties();

foreach (PropertyInfo prop in props)

{

Color clr = (Color)prop.GetValue(null, null);

bool isBlack = .222 * clr.R + .707 * clr.G + .071 * clr.B > 128;

Label label = new Label();

label.Content = prop.Name;

label.Background = new SolidColorBrush(clr);

label.Foreground = isBlack ? Brushes.Black : Brushes.White;

label.Width = 80;

label.Margin = new Thickness(0, 0, 0, 0);

label.Tag = clr;

// CanvasBackgroundListBoxColor.Items.Add(label);

fontcolorcombobox.Items.Add(label);

}

}

private void FontColorComboBox_CanExecute(object sender, CanExecuteRoutedEventArgs e)

{

if (richtextbox != null && richtextbox.Selection.Text.Length > 0)

{

e.CanExecute = true;

}

}

private void FontColorComboBox_Executed(object sender, ExecutedRoutedEventArgs e)

{

if (richtextbox != null && richtextbox.Selection.Text.Length > 0)

{

// var label = fontcolorcombobox.SelectedItem as Label;

// if (label != null)

// {

//    var fontcolor = label.Background as SolidColorBrush;

//richtextbox.Selection.ApplyPropertyValue(Run.ForegroundProperty, (fontcolorcombobox.SelectedItem

as Label).Background.ToString());

//}

}

}

#endregion  RibbonTab 字体 设置颜色

#endregion RibbonTab 字体

#endregion RibbonTab

}

}

以上是我编写的代码，为方便开我将其他无关代码删除：

第一个问题：加下划线的代码，该RibbonComboBox容器是用来放置字体的容器，RibbonComboBoxItem可以放置各种文本字体，但是当有很多字体时，前台代码显得比价笨重，却相当繁琐。现在在该工程目录下有一个Fonts的文字字体文件包，其中放置上百个文字字体文件，现在我想通过后台代码将该字体Fonts文件中的字体文件自动加载到前台RibbonComboBox容器中，形成RibbonComboBoxItem子项，并显示在RibbonComboBox中，当选择RibbonComboBoxItem的字体样式时，通过后台代码可将选中的文字变为相应的字体样式。

要实现这样的功能，后台代码该如何补写？希望前辈尽可能在现有基础上补写代码。

第二个问题：黑体代码。该RibbonComboBox容器是用来放置字体颜色的容器，我已经通过后台代码在该RibbonComboBox容器放入了很多颜色，代码实现如上加黑及下划线部分，并已成功宣示。当我选择该RibbonComboBox容器的颜色是，通过后台代码可将所选的文字颜色进行相应的改变。但是当我选择颜色后程序无法运行。

我要实现文本字体颜色的变化我该如何改写代码的功能实现部分(该部分已被注解)，或是该代码有问题，如果有问题我应该怎样做，希望前辈尽可能在现有基础上补写代码或修改代码。