[Experiment] Markdig based MarkdownTextBlock

components/MarkdownTextBlock/OpenSolution.bat

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+@ECHO OFF
+
+powershell ..\..\tooling\ProjectHeads\GenerateSingleSampleHeads.ps1 -componentPath %CD% %*

components/MarkdownTextBlock/samples/Dependencies.props

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+<!--
+    WinUI 2 under UWP uses TargetFramework uap10.0.*
+    WinUI 3 under WinAppSdk uses TargetFramework net6.0-windows10.*
+    However, under Uno-powered platforms, both WinUI 2 and 3 can share the same TargetFramework.
+
+    MSBuild doesn't play nicely with this out of the box, so we've made it easy for you.
+
+    For .NET Standard packages, you can use the Nuget Package Manager in Visual Studio.
+    For UWP / WinAppSDK / Uno packages, place the package references here.
+-->
+<Project>
+    <!-- WinUI 2 / UWP -->
+    <ItemGroup Condition="'$(IsUwp)' == 'true'">
+        <!-- <PackageReference Include="Microsoft.Toolkit.Uwp.UI.Controls.Primitives" Version="7.1.2"/> -->
+    </ItemGroup>
+
+    <!-- WinUI 2 / Uno -->
+    <ItemGroup Condition="'$(IsUno)' == 'true' AND '$(WinUIMajorVersion)' == '2'">
+        <!-- <PackageReference Include="Uno.Microsoft.Toolkit.Uwp.UI.Controls.Primitives" Version="7.1.11"/> -->
+    </ItemGroup>
+
+    <!-- WinUI 3 / WinAppSdk -->
+    <ItemGroup Condition="'$(IsWinAppSdk)' == 'true'">
+        <!-- <PackageReference Include="CommunityToolkit.WinUI.UI.Controls.Primitives" Version="7.1.2"/> -->
+    </ItemGroup>
+
+    <!-- WinUI 3 / Uno -->
+    <ItemGroup Condition="'$(IsUno)' == 'true' AND '$(WinUIMajorVersion)' == '3'">
+        <!-- <PackageReference Include="Uno.CommunityToolkit.WinUI.UI.Controls.Primitives" Version="7.1.100-dev.15.g12261e2626"/> -->
+    </ItemGroup>
+</Project>

components/MarkdownTextBlock/samples/MarkdownTextBlock.Samples.csproj

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+<Project Sdk="MSBuild.Sdk.Extras/3.0.23">
+  <PropertyGroup>
+    <ToolkitComponentName>MarkdownTextBlock</ToolkitComponentName>
+  </PropertyGroup>
+
+  <!-- Sets this up as a toolkit component's sample project -->
+  <Import Project="$(ToolingDirectory)\ToolkitComponent.SampleProject.props" />
+  <ItemGroup>
+    <None Remove="Assets\MarkdownTextBlock.png" />
+  </ItemGroup>
+  <ItemGroup>
+    <Content Include="Assets\MarkdownTextBlock.png">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </Content>
+  </ItemGroup>
+</Project>

components/MarkdownTextBlock/samples/MarkdownTextBlock.md

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+---
+title: MarkdownTextBlock
+author: nerocui
+description: A control for displaying markdown natively.
+keywords: MarkdownTextBlock, Control, Layout
+dev_langs:
+  - csharp
+category: Controls
+subcategory: StatusAndInfo
+experimental: true
+discussion-id: 0
+issue-id: 0
+icon: Assets/MarkdownTextBlock.png
+---
+
+<!-- To know about all the available Markdown syntax, Check out https://docs.microsoft.com/contribute/markdown-reference -->
+<!-- Ensure you remove all comments before submission, to ensure that there are no formatting issues when displaying this page.  -->
+<!-- It is recommended to check how the Documentation will look in the sample app, before Merging a PR -->
+<!-- **Note:** All links to other docs.microsoft.com pages should be relative without locale, i.e. for the one above would be /contribute/markdown-reference -->
+<!-- Included images should be optimized for size and not include any Intellectual Property references. -->
+
+<!-- Be sure to update the discussion/issue numbers above with your Labs discussion/issue id numbers in order for UI links to them from the sample app to work. -->
+
+# MarkdownTextBlock
+
+MarkdownTextBlock is a evolution of the existing MarkdownTextBlock in the community toolkit. This new implementation uses the popular [Markdig](https://github.com/xoofx/markdig) library for parsing. This solves some long standing bugs and feature gaps in our existing implementation.
+
+## Templated Controls
+
+The Toolkit is built with templated controls. This provides developers a flexible way to restyle components
+easily while still inheriting the general functionality a control provides. The examples below show
+how a component can use a default style and then get overridden by the end developer.
+
+> [!Sample MarkdownTextBlockCustomSample]

components/MarkdownTextBlock/samples/MarkdownTextBlockCustomSample.xaml

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+<!--  Licensed to the .NET Foundation under one or more agreements. The .NET Foundation licenses this file to you under the MIT license. See the LICENSE file in the project root for more information.  -->
+<Page x:Class="MarkdownTextBlockExperiment.Samples.MarkdownTextBlockCustomSample"
+      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+      xmlns:controls="using:CommunityToolkit.Labs.WinUI.MarkdownTextBlock"
+      xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+      xmlns:local="using:MarkdownTextBlockExperiment.Samples"
+      xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+      mc:Ignorable="d">
+
+    <Grid>
+        <Grid.RowDefinitions>
+            <RowDefinition Height="auto" />
+            <RowDefinition Height="auto" />
+            <RowDefinition Height="auto" />
+            <RowDefinition Height="auto" />
+        </Grid.RowDefinitions>
+        <TextBlock Grid.Row="0"
+                   Margin="0,0,0,12"
+                   FontSize="16"
+                   FontWeight="Bold"
+                   Text="Try it live!" />
+        <Grid Grid.Row="1">
+            <Grid.ColumnDefinitions>
+                <ColumnDefinition Width="*" />
+                <ColumnDefinition Width="*" />
+            </Grid.ColumnDefinitions>
+            <controls:MarkdownTextBlock Grid.Column="0"
+                                        Config="{x:Bind LiveMarkdownConfig, Mode=OneTime}"
+                                        Text="{x:Bind MarkdownTextBox.Text, Mode=OneWay}" />
+            <TextBox x:Name="MarkdownTextBox"
+                     Grid.Column="1"
+                     AcceptsReturn="True" />
+        </Grid>
+        <TextBlock Grid.Row="2"
+                   Margin="0,0,0,12"
+                   FontSize="16"
+                   FontWeight="Bold"
+                   Text="Built-in Sample" />
+        <controls:MarkdownTextBlock Grid.Row="3"
+                                    Config="{x:Bind MarkdownConfig, Mode=OneTime}"
+                                    Text="{x:Bind Text, Mode=OneTime}" />
+    </Grid>
+</Page>