我们如何检查动态粘土物体是否具有属性？ [英] How do we check whether a dynamic clay object has a property?

问题描述

我有一个动态对象，我认为是用Clay实现的。它具有两个可能的属性名称之一。我想使用哪个属性名称可用。以下内容不起作用：

I have a dynamic object, that I think is implemented with Clay. It has one of two possible property names. I want to use which ever property name is available. The following doesn't work:

dynamic workItemPart = item.WorkItem; // is an Orchard.ContentManagement.ContentPart
var learnMore = workItemPart.LearnMore ?? workItemPart.LearnMoreField;

它抛出一个 Microsoft.CSharp.RuntimeBinder.RuntimeBinderException ：

不包含'LearnMore'的定义

does not contain a definition for 'LearnMore'

我们如何检查动态粘贴对象是否具有属性？ In JavaScript，例如，我们可以执行以下操作。

var workItemPart = {
    LearnMoreField: "Sure"    
    }
console.log(workItemPart.LearnMore || workItemPart.LearnMoreField);

C＃中有什么简洁的Clay吗？

Is there anything this concise in C# with Clay?

相关：

Orchard.ContentManagement.ContentPart用Clay实现？

https://twitter.com/bleroy/status/497078654405312512

推荐答案

您也可以使用索引的方法：

You can also use the indexed approach:

var learnMore = workItemPart["LearnMore"] != null ? 
     workItemPart.LearnMore : workItemPart.LearnMoreField;

希望这有帮助。

更新

我不知道为什么不这样做。两种方法都应该起作用

I'm not sure why it doesn't. Both methods should work.

        dynamic New = new ClayFactory();
        var person = New.Person();
        person.skill = "Outstanding";
        var talent = person.talent;
        var talentTwo = person["talent"];
        var skill = person.talent ?? person.skill;
        Console.WriteLine(skill);
        skill = person.skill ?? person.talent;
        Console.WriteLine(skill);

也许是乌节扔你一个曲折球...

Perhaps it is Orchard throwing you a curveball ...

有趣的是，null-coalesce操作符没有正确处理第一个测试用例。但是，标准测试成功：

Interesting enough, the null-coalesce operator does not process the first test case correctly. However, the standard test succeeds:

        skill = person.talent != null ? person.talent : person.skill;
        Console.WriteLine(skill);

此处不知道该建议什么。

Not sure what to advise you at this point.

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