how to get return value from staticcoroutine

Unity Engine
1

so i have this class

using UnityEngine;
using System.Collections;

public class StaticCoroutine : MonoBehaviour {
	
	static public StaticCoroutine instance;
	
	void Awake ()
	{ 
		instance = this;
	}

	IEnumerator Perform(IEnumerator coroutine)
	{
		yield return StartCoroutine(coroutine);
	}

	static public void DoCoroutine(IEnumerator coroutine){
		instance.StartCoroutine(instance.Perform(coroutine));
	}
	
	public static void getFile(string path)
	{
		StaticCoroutine.DoCoroutine(DoGetFile(path));
	}
 
	static IEnumerator DoGetFile(string path)
	{
		var www = new WWW(path);
		yield return www;
		string result = www.text;
		Debug.Log(result);
	}
}

when i call this code from other script using

StaticCoroutine.getFile(url);

it works and the console show the result, but how if i want to use the result in other script and store it in variable…
something like if i’m doing in other normal method…

return result;

and will end like this

string variableResult = StaticCoroutine.getFile(url);
2

Lambda.

So it would go like this

string variableResult = null;
StaticCoroutine.getFile(url, (string returnValue) => {
    variableResult = returnValue;
});