using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using XLua;

public class Test1 : MonoBehaviour {

    [XLua.CSharpCallLua]
    public delegate double LuaMax(double a, double b);

	void Start () {
        //创建Lua虚拟机,建议创建一次重复使用。
        LuaEnv luaenv = new LuaEnv();
        //Lua调用C#函数
        luaenv.DoString("CS.UnityEngine.Debug.Log('hello world')");
        
        //C#调用Lua函数
        var max = luaenv.Global.GetInPath<LuaMax>("math.max");
        Debug.Log("max:" + max(32, 12));

        //释放绑定
        //Lua虚拟机在调用Dispose()前必须释放所有函数绑定，否则会报以下错:
        //InvalidOperationException: try to dispose a LuaEnv with C# callback!
        max = null;

        //释放Lua虚拟机
        luaenv.Dispose();
	}
}

运行测试