Example code for "Downloading the hydra" blog post on AngryAnt.com

Build.sh

mcs -target:library -out:MyAssembly.dll -r:/Applications/Unity/Unity.app/Contents/Frameworks/UnityEngine.dll  MyAssembly.cs

MyAssembly.cs

using UnityEngine;

public class MyClass
{
	public static string myString = "This is my string from my class in my assembly";

	public int LogMyString ()
	{
		Debug.Log (myString);
		return 2 + 2;
	}
}

NewBehaviourScript.cs

using UnityEngine;
using System.Collections;
using System.Reflection;

public class NewBehaviourScript : MonoBehaviour
{
	private string m_MessageString = "Waiting for assembly";



	void OnAssemblyLoaded (WWWAssembly loadedAssembly)
	{
		m_MessageString = "Assembly " + loadedAssembly.URL + "\n";

		System.Type type = loadedAssembly.Assembly.GetType ("MyClass");

		FieldInfo field = type.GetField ("myString");
		m_MessageString += (field.GetValue (null) as string) + "\n";

		object instance = loadedAssembly.Assembly.CreateInstance ("MyClass");
		MethodInfo method = type.GetMethod ("LogMyString");
		m_MessageString += "Return value: " + method.Invoke (instance, null).ToString ();
	}



	void OnAssemblyLoadFailed (string url)
	{
		m_MessageString = "Failed to load assembly at " + url;
	}



	void OnGUI ()
	{
		GUILayout.BeginArea (new Rect (0.0f, 0.0f, Screen.width, Screen.height));
			GUILayout.FlexibleSpace ();
			GUILayout.BeginHorizontal ();
				GUILayout.FlexibleSpace ();
				GUILayout.Box (m_MessageString);
				GUILayout.FlexibleSpace ();
			GUILayout.EndHorizontal ();
			GUILayout.FlexibleSpace ();
		GUILayout.EndArea ();
	}
}

WWWAssemblyLoader.cs

using UnityEngine;
using System.Collections;
using System.Reflection;


public class WWWAssemblyLoader : MonoBehaviour
{
	public string m_AssemblyURL;
	private string m_ErrorString = "";
	private WWW m_WWW;
	private bool m_Complete = true;



	public void Start ()
	{
		if (m_AssemblyURL != "")
		{
			ReloadAssembly (m_AssemblyURL);
		}
	}



	public string AssemblyURL
	{
		get
		{
			return m_AssemblyURL;
		}
		set
		{
			if (m_AssemblyURL != value)
			{
				ReloadAssembly (value);
			}
		}
	}



	public float Progress
	{
		get
		{
			return m_Complete ? 1.0f : m_WWW.progress;
		}
	}



	public string Error
	{
		get
		{
			return m_ErrorString;
		}
	}



	public void ReloadAssembly (string url)
	{
		m_Complete = false;
		m_ErrorString = "";
		m_AssemblyURL = url;
		m_WWW = new WWW (m_AssemblyURL);
	}



	public void Update ()
	{
		if (!m_Complete)
		{
			if (m_WWW.error != null)
			{
				m_ErrorString = m_WWW.error;
				m_Complete = true;
				SendMessage ("OnAssemblyLoadFailed", m_AssemblyURL);
			}
			else if (m_WWW.isDone)
			{
				Assembly assembly = LoadAssembly ();
				m_Complete = true;
				if (assembly != null)
				{
					Debug.Log ("Done");
					SendMessage ("OnAssemblyLoaded", new WWWAssembly (m_AssemblyURL, assembly));
				}
				else
				{
					Debug.Log ("Failed");
					SendMessage ("OnAssemblyLoadFailed", m_AssemblyURL);
				}
			}
		}
	}



	private Assembly LoadAssembly ()
	{
		try
		{
			return Assembly.Load (m_WWW.bytes);
		}
		catch (System.Exception e)
		{
			m_ErrorString = e.ToString ();
			return null;
		}
	}
}



public class WWWAssembly
{
	private string m_URL;
	private Assembly m_Assembly;

	public string URL
	{
		get
		{
			return m_URL;
		}
	}

	public Assembly Assembly
	{
		get
		{
			return m_Assembly;
		}
	}

	public WWWAssembly (string url, Assembly assembly)
	{
		m_URL = url;
		m_Assembly = assembly;
	}
}

Can you update this gist to work with unity 4?

Hello i using your tutorial. with AssemblyURL = https://www.dropbox.com/s/uucth632rb809p4/MyAssemble.dll?dl=0.
But not run. see again, please!