Controller's action with dictionary as parameter stripping to dot

I have an Action that receives a class with a dictionary in its properties:

public ActionResult TestAction(TestClass testClass)
{
    return View();
}

public class TestClass
{
    public Dictionary<string, string> KeyValues { get; set; }
}

If I do a post to my action with the following JSON:

{
  "KeyValues": {
    "test.withDoT": "testWithDot"
  }
}

The key in my dictionary is stripped to the dot and has nothing in the value.

Trying without the dot works. How can I do a post with a dot in a Dictionary<string, string> with MVC?

---

We gave a blind try supposing that there is a regex parser somewhere in the deep (well it was minimal the chance) and to escape 'dot'.

After thinking a while I concluded: dot is not a legal char in identifiers. Yes I know it is a key in the C# dictionary, but in the json part (and javascript) it could be in the identifier syntax role.

So I strongly suggest to replace client side the . (dot) with an escape sequence like _dot_ and replace back it in server side. Performance will suffer of course.

---

Change the javascript to

var data = { 'KeyValues[0].Key': 'test.withDoT', 'KeyValues[0].Value': 'testWithDot' };

and then post using

$.post('@Url.Action("TestAction")', data, function(data) { ...`

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