.NET Samples - Create 03-workflows learning path step (#4102)

dotnet/samples/03-workflows/Visualization/Program.cs

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+// Copyright (c) Microsoft. All rights reserved.
+
+using Microsoft.Agents.AI.Workflows;
+
+namespace WorkflowVisualizationSample;
+
+/// <summary>
+/// Sample demonstrating workflow visualization using Mermaid and DOT (Graphviz) formats.
+/// </summary>
+/// <remarks>
+/// This sample shows how to use the ToMermaidString() and ToDotString() extension methods
+/// to generate visual representations of workflow graphs. The visualizations can be used
+/// for documentation, debugging, and understanding complex workflow structures.
+/// </remarks>
+internal static class Program
+{
+    /// <summary>
+    /// Entry point that generates and displays workflow visualizations in Mermaid and DOT formats.
+    /// </summary>
+    /// <param name="args">Command line arguments (not used).</param>
+    private static void Main(string[] args)
+    {
+        // Step 1: Build the workflow you want to visualize
+        Workflow workflow = WorkflowMapReduceSample.Program.BuildWorkflow();
+
+        // Step 2: Generate and display workflow visualization
+        Console.WriteLine("Generating workflow visualization...");
+
+        // Mermaid
+        Console.WriteLine("Mermaid string: \n=======");
+        var mermaid = workflow.ToMermaidString();
+        Console.WriteLine(mermaid);
+        Console.WriteLine("=======");
+
+        // DOT
+        Console.WriteLine("DiGraph string: *** Tip: To export DOT as an image, install Graphviz and pipe the DOT output to 'dot -Tsvg', 'dot -Tpng', etc. *** \n=======");
+        var dotString = workflow.ToDotString();
+        Console.WriteLine(dotString);
+        Console.WriteLine("=======");
+    }
+}