HtmlMail.TemplateEngine 1.0.3

.NET 8.0 This package targets .NET 8.0. The package is compatible with this framework or higher. 
dotnet add package HtmlMail.TemplateEngine --version 1.0.3
                    


                    

                
NuGet\Install-Package HtmlMail.TemplateEngine -Version 1.0.3
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package. 
<PackageReference Include="HtmlMail.TemplateEngine" Version="1.0.3" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
<PackageVersion Include="HtmlMail.TemplateEngine" Version="1.0.3" />
                    


                            Directory.Packages.props
                        

                    

                
<PackageReference Include="HtmlMail.TemplateEngine" />
                    


                            Project file
For projects that support Central Package Management (CPM), copy this XML node into the solution Directory.Packages.props file to version the package. 
paket add HtmlMail.TemplateEngine --version 1.0.3
                    


                    

                
#r "nuget: HtmlMail.TemplateEngine, 1.0.3"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package. 
#:package HtmlMail.TemplateEngine@1.0.3
#:package directive can be used in C# file-based apps starting in .NET 10 preview 4. Copy this into a .cs file before any lines of code to reference the package. 
#addin nuget:?package=HtmlMail.TemplateEngine&version=1.0.3
                    


                            Install as a Cake Addin
                        

                    

                
#tool nuget:?package=HtmlMail.TemplateEngine&version=1.0.3
                    


                            Install as a Cake Tool

📄 HtmlMail Template Engine (.NET)

Uma pequena biblioteca para gerar templates HTML com interpolação de C# diretamente no HTML, sem depender de Razor ou bibliotecas externas.

✅ Funcionalidades

  • Template HTML com expressões C# inline: @{Model.Property} ou @{ código C# }
  • Blocos de código C# dentro do HTML
  • Suporte a Model fortemente tipado
  • Inclusão de CSS externo no template
  • Compilação dinâmica com Roslyn (Microsoft.CodeAnalysis.CSharp.Scripting)

🚀 Como usar

1. Instale o pacote NuGet necessário

A biblioteca depende de:

  • Microsoft.CodeAnalysis.CSharp.Scripting

No seu projeto:

dotnet add package Microsoft.CodeAnalysis.CSharp.Scripting

2. Estrutura esperada

Você precisa ter:

  • Um arquivo .html como template
  • Um arquivo .css para estilos
  • Um objeto Model (classe C#) com os dados

Exemplo de HTML Template:

caminho: template.html

<html>
<head>
    <style></style>
</head>
<body>
    <h1>Olá @Model.Nome!</h1>

    <p>Sua idade: @{ Model.Idade + 1 }</p>

    @{
    if (Model.Idade >= 18)
    {
       sb.Append("<p>É Maior de idade </p>");
    } else
    {
      sb.Append("<p>Não é Maior de idade</p>");
    }
    }

    <p>Status: @Model.Status</p>
</body>
</html>

Exemplo de CSS:

caminho: style.css

body {
    font-family: Arial, sans-serif;
    color: #333;
}

Exemplo de Model:

public class Usuario
{
    public string Nome { get; set; } = "";
    public int Idade { get; set; }
    public string Status { get; set; } = "";
}

Exemplo de uso no C#:

using HtmlMail;

var usuario = new Usuario
{
    Nome = "João",
    Idade = 20,
    Status = "Ativo"
};

string caminhoHtml = "template.html";
string caminhoCss = "style.css";

string htmlGerado = await Template.GenerateHtml(caminhoHtml, caminhoCss, usuario);

Console.WriteLine(htmlGerado);

✅ Resultado esperado:

<html>
<head>
    <style>
body {
    font-family: Arial, sans-serif;
    color: #333;
}
    </style>
</head>
<body>
    <h1>Olá João!</h1>

    <p>Sua idade: 21</p>

    <p>É Maior de idade</p>

    <p>Status: Ativo</p>
</body>
</html>

✅ Sintaxe suportada no HTML:

Tipo Exemplo Resultado
Expressão simples @Model.Nome Substitui pelo valor da propriedade
Expressão C# inline @{ Model.Idade + 1 } Avalia a expressão e insere o resultado
Bloco de código @{ if (...) { sb.Append(...); } } Executa um bloco de código C# durante a renderização

💡 Importante: Dentro de blocos de código, use sb.Append() para adicionar HTML.

⚠️ Cuidados

  • O template é compilado e executado como código C#. Cuidado com código malicioso se o template for fornecido por usuários externos.
  • Exceções de compilação são retornadas com a mensagem e o script gerado para facilitar o debug.

📌 Requisitos:

  • .NET 6 ou superior
  • Pacote NuGet: Microsoft.CodeAnalysis.CSharp.Scripting

✅ Possíveis melhorias futuras:

  • Suporte a Partial Views
  • Cache de scripts compilados

📃 Licença

Fique a vontade!

Product Compatible and additional computed target framework versions.
.NET net8.0 is compatible.  net8.0-android was computed.  net8.0-browser was computed.  net8.0-ios was computed.  net8.0-maccatalyst was computed.  net8.0-macos was computed.  net8.0-tvos was computed.  net8.0-windows was computed.  net9.0 was computed.  net9.0-android was computed.  net9.0-browser was computed.  net9.0-ios was computed.  net9.0-maccatalyst was computed.  net9.0-macos was computed.  net9.0-tvos was computed.  net9.0-windows was computed.  net10.0 was computed.  net10.0-android was computed.  net10.0-browser was computed.  net10.0-ios was computed.  net10.0-maccatalyst was computed.  net10.0-macos was computed.  net10.0-tvos was computed.  net10.0-windows was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

NuGet packages

This package is not used by any NuGet packages.

GitHub repositories

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Version Downloads Last Updated
1.0.3 216 6/16/2025
1.0.2 210 6/16/2025
1.0.0 214 6/16/2025