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Welcome to NPlant. NPlant is intended to be a FluentAPI in C# for creating UML diagrams. The "N" is for .NET and the "Plant" is for PlantUML. PlantUML is a textual DSL for UML. It is extremely powerful and very useful on it it's own. NPlant augments PlantUML by bringing the artifact authoring experience to code and automates the process of generating the PlantUML notation and subsequently the final artifact (PNG, JPEG, etc.). You can find more information on PlantUML here:

Why NPlant?

UML artifacts can be very useful, but if they live disconnected from the software system's source code, they can easily rot or be a burden to maintain. As the software system changes, in order for the artifacts to remain useful, they too much change in step. Modern refactoring tools such as JetBrain's Resharper make it very easy to change the source code (i.e. class renames, etc), but anything disconnected from the source code will not be acted upon by these tools. Bringing the artifacts into the code codifies it as a first class thing that must be maintained, makes them easier to discover and evolve with the software system.

This library is not intended to replace PlantUML - it's simply a tool to help create PlantUML notation. There are plenty of scenarios where authoring PlantUML notation by hand still makes great sense. If you're looking to create artifacts for existing software systems build in .NET, or you are ready to fully automate the artifact creation process with your CI build tools and processes, NPlant can help you tremendously.

How does it work?

Much like NHibernate or AutoMapper where you do declare meta models in code, NPlant offers C# classes that represent your atifacts like so:

public class SimpleHasManyDiagram : ClassDiagram
    public SimpleHasManyDiagram()

public class Person
    public IList<Hand> Hands { get; set; }

public class Hand

If you run that through our our nant task like so:

<?xml version="1.0"?>
<project name="test" default="main" basedir=".">
	<target name="main">
		<nplant assembly="bin\Debug\NPlant.Tests.dll" dir="generation" />

It will produce a file in the "generation" folder named "SimpleHasManyDiagram.nplant". That file will contain PlantUML notation for a class diagram like so:

class "Person" {
"Person" --o "Hand" : "has many\nHand"
class "Hand" {

Which can be fed to the PlantUML commandline tool to produce an image like so:


What's the current state?

I just started this project based on needs I had in my day job. This is very much in alpha phase and I expect major API changes to occur for some time. Please take a dependency on this library with the idea that things are going to be changing rapidly. Today it only support Class Diagrams and generated them automatically in a rather opinionated way. My goal was to create intelligent defaults that errored on the side of verbosity, but provide means to suppress verbosity as needed.

What platforms does it support?

At present it's support .NET 4.5. I haven't tested it with anything else, but have plans to support a much broader array of platforms and framework versions when I'm in a position to be able to effectively tests all of them on a repeated basis.

What's the license?

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

I'm only interested in protecting myself and the effort I've put into this personally. I want to have this as widely available as possible. If this license isn't acceptable for you and your usage, let me know - I would like to try to accommodate you if I can....

How to contribute

We happily take pull requests. Please submit PR's on the "development" branch as "master" is reserved for nuget releases. Please find the nant script in the root. That build script will handle nuget dependency restoration and first time compilation. I intend to replace nuget for dependency restoration with something more straightforward at some point, but for the time being please don't rely on VS+nuget package restoration and use


Fluent C# API in C# for creating UML diagrams in PlantUML







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