如何通过AdWords向JavaScript公开ClearScript？

Question

上下文: VS2015社区；C#；ClearScript.V8.5.4.5；Google.AdWords.18.25.0

我正在尝试创建一个脚本环境来执行我的预算。在C#方面，我正在设置一个JScript环境，并向它公开所需的所有AdWords类型和对象，即

    static JScriptEngine JSengine = null;
    static Dictionary<string, object> Settings = new Dictionary<string, object>();

    static void Main(string[] args)
    {
        if (args.Length < 1)
        {
            Console.WriteLine("engine script.js");
            Environment.Exit(1);
        }
        string scriptSpec = args[0];

        try
        {
            JSengine = new JScriptEngine(WindowsScriptEngineFlags.EnableDebugging | WindowsScriptEngineFlags.EnableJITDebugging);
        }
        catch (Exception exc)
        {
            return;
        }

        // .. others as well e.g. File, Environment etc

        JSengine.AddHostType("AdWordsUser", typeof(AdWordsUser));
        JSengine.AddHostType("AdWordsAppConfig", typeof(AdWordsAppConfig));
        JSengine.AddHostType("BudgetOrderService", typeof(BudgetOrderService));
        JSengine.AddHostType("Selector", typeof(Selector));
        JSengine.AddHostType("Predicate", typeof(Predicate));
        JSengine.AddHostType("BudgetOrderPage", typeof(BudgetOrderPage));
        JSengine.AddHostType("BudgetOrder", typeof(BudgetOrder));
        JSengine.AddHostType("PredicateOperator", typeof(PredicateOperator));
        JSengine.AddHostType("AdWordsService", typeof(AdWordsService));

        JSengine.AddHostObject("Settings", Settings);

        object answer = null;
        string script = File.ReadAllText(scriptSpec);
        try
        {
            answer = JSengine.Evaluate(script);
        }
        catch (ScriptEngineException see)
        {
            Console.WriteLine(see.ErrorDetails);
        }
    }

我已经做过几次这样的事了，所以没有什么意外。

我目前遇到的困难是一个JScript方面。此时的代码如下所示：

var user = new AdWordsUser();
user.OAuthProvider.ClientId = "anonymised.apps.googleusercontent.com";
user.OAuthProvider.ClientSecret = "anonymised";
user.OAuthProvider.AccessToken = "";
user.Config.OAuth2RefreshToken = "anonymised";
user.OAuthProvider.RefreshAccessToken();

var config = new AdWordsAppConfig();
config.ClientCustomerId = "anonymised";
config.DeveloperToken = "anonymised";
config.UserAgent = "anonymised";
config.OAuth2ClientId = user.OAuthProvider.ClientId;
config.OAuth2ClientSecret = user.OAuthProvider.ClientSecret;
config.OAuth2AccessToken = user.OAuthProvider.AccessToken;
config.OAuth2RefreshToken = user.Config.OAuth2RefreshToken;

var bos = user.GetService(AdWordsService.v201603.BudgetOrderService);
var bas = bos.getBillingAccounts();

此时，bos对getBillingAccounts一无所知。bos了解它的唯一方法是执行

var bos = new BudgetOrderService();

但是，bos和它在user中需要的值之间没有连接，试图执行getBillingAccounts会引发一个错误。

由此派生的原始C#代码是

BudgetOrderService bos = (BudgetOrderService)user.GetService(AdWordsService.v201603.BudgetOrderService);
BillingAccount[] bas = bos.getBillingAccounts();

将GetService调用转换为BudgetOrderService似乎足以使getBillingAccounts在bos中可见。然而，JScript不允许我这样做。

那么从这里到哪里？

Answer 1

您应该能够在脚本代码中进行强制转换。试试这个：

// C#
JSengine.Script.host = new HostFunctions();

然后，在您的脚本中：

// JavaScript
var bos = user.GetService(AdWordsService.v201603.BudgetOrderService);
bos = host.cast(BudgetOrderService, bos);

也可以在C#代码中公开执行强制转换的委托。