C# directed graph generating library

Question

I noticed that Visual Studio can generate graphs using something called DGML.

I would like to generate a graph like the following one in my C# application.

It does not have to be interactive like the VS. I just want to generate a static such image and save it as a general graphics file, such as PNG.

Is there any free .NET library for this?

Answer 1

A little late, but it's actually relatively easy to implement yourself:

public class DGMLWriter {     public struct Graph     {         public Node[] Nodes;         public Link[] Links;     }      public struct Node     {         [XmlAttribute]         public string Id;         [XmlAttribute]         public string Label;          public Node(string id, string label)         {             this.Id = id;             this.Label = label;         }     }      public struct Link     {         [XmlAttribute]         public string Source;         [XmlAttribute]         public string Target;         [XmlAttribute]         public string Label;          public Link(string source, string target, string label)         {             this.Source = source;             this.Target = target;             this.Label = label;         }     }      public List<Node> Nodes { get; protected set; }     public List<Link> Links { get; protected set; }      public DGMLWriter()     {         Nodes = new List<Node>();         Links = new List<Link>();     }      public void AddNode(Node n)     {         this.Nodes.Add(n);     }      public void AddLink(Link l)     {         this.Links.Add(l);     }      public void Serialize(string xmlpath)     {         Graph g = new Graph();         g.Nodes = this.Nodes.ToArray();         g.Links = this.Links.ToArray();          XmlRootAttribute root = new XmlRootAttribute("DirectedGraph");         root.Namespace = "http://schemas.microsoft.com/vs/2009/dgml";         XmlSerializer serializer = new XmlSerializer(typeof(Graph), root);         XmlWriterSettings settings = new XmlWriterSettings();         settings.Indent = true;         using (XmlWriter xmlWriter = XmlWriter.Create(xmlpath, settings))         {             serializer.Serialize(xmlWriter, g);         }     } } 

Answer 2

I have used NodeXL in the past, for generating workflow graphs within a web application, but it is suitable for desktop applications and interaction as well.

The description might confuse you a bit, making you think it's just for Excel. Not at all, you can use it's object model directly and graph whatever you want from .NET.