Fix build on VStudio (I'm mainly using VSCode with this project)

Author: onizet

HtmlToOpenXml.sln

@@ -1,17 +1,17 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio 15
-VisualStudioVersion = 15.0.26730.16
+# Visual Studio 17
+VisualStudioVersion = 17.8.34511.84
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "HtmlToOpenXml", "src\Html2OpenXml\HtmlToOpenXml.csproj", "{EF700F30-C9BB-49A6-912C-E3B77857B514}"
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "src", "src", "{58520A98-BA53-4BA4-AAE3-786AA21331D6}"
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "test", "test", "{84EA02ED-2E97-47D2-992E-32CC104A3A7A}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Demo", "examples\Demo\Demo.csproj", "{A1ECC760-B9F7-4A00-AF5F-568B5FD6F09F}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Demo", "examples\Demo\Demo.csproj", "{A1ECC760-B9F7-4A00-AF5F-568B5FD6F09F}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "HtmlToOpenXml.Tests", "test\HtmlToOpenXml.Tests\HtmlToOpenXml.Tests.csproj", "{CA0A68E0-45A0-4A01-A061-F951D93D6906}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "HtmlToOpenXml.Tests", "test\HtmlToOpenXml.Tests\HtmlToOpenXml.Tests.csproj", "{CA0A68E0-45A0-4A01-A061-F951D93D6906}"
 EndProject
 Global
     GlobalSection(SolutionConfigurationPlatforms) = preSolution

examples/Demo/Demo.csproj

@@ -14,6 +14,11 @@
     <ProjectReference Include="..\..\src\Html2OpenXml\HtmlToOpenXml.csproj" />
   </ItemGroup>
 
+  <PropertyGroup Condition="'$(Configuration)' == 'Debug'">
+    <DefineConstants>$(DefineConstants);DEBUG</DefineConstants>
+    <Optimize>false</Optimize>
+  </PropertyGroup>
+
   <ItemGroup>
     <EmbeddedResource Include="Resources\*" />
   </ItemGroup>

src/Html2OpenXml/HtmlToOpenXml.csproj

@@ -50,6 +50,10 @@
     <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="6.0.0" />
   </ItemGroup>
 
+  <PropertyGroup Condition="'$(Configuration)' == 'Debug'">
+    <DefineConstants>$(DefineConstants);DEBUG</DefineConstants>
+    <Optimize>false</Optimize>
+  </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)' == 'Release'">
     <IncludeSymbols>true</IncludeSymbols>
     <SymbolPackageFormat>snupkg</SymbolPackageFormat>