properties - Umbraco - how to set the value of a property using razor script

Question

I'm trying to create a very simple polling form and I thought of having a go at it using razor instead of using an external control.

I've created a form that lists one question and a list of answers and when we press submit we go to the page that calls the razor script that handles the results.

What I want to do is loop through all the answers and increment their counter by one. There is a numeric property called "Counter" on each Answer object.

However that keeps failing. If I do:

var objAnswer = @Model.NodeById(Int32.Parse(submittedAnswer));
objAnswer.getProperty("Counter").Value++;

or similar ways, they all fail. What is weird is that objAnswer.getProperty("Counter") does contain a number, but when I try to set it I get this error:

   umbraco.MacroEngines.DynamicNull' does not contain a definition for 'Value'

I get I've also tried with

Document post = new Document(objAnswer.Id);
post.Publish(user);

but that fails as well.

Is there an easy way of achieving this?

---

The answer is this!!

      Document doc = new Document(objAnswer.Id);
      doc.getProperty("counter").Value = 34;
      umbraco.BusinessLogic.User author = umbraco.BusinessLogic.User.GetUser(0); 
      doc.Publish(author);
      umbraco.library.UpdateDocumentCache(doc.Id);

Not that the property needs to be lower case.

Answer 1

Model.NodeById（）は、プロパティが読み取り専用であるDynamicNodeオブジェクトを返します。特に、NodeとDynamicNodeの両方がXMLキャッシュからデータを取得するのに対し、Documentはデータベースを操作するため、Documentルートを確実に使用する必要があります。