POST json dictionary

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An unfortunate workaround:

data.dictionary = {
    'A': 'a',
    'B': 'b'
};

data.dictionary = JSON.stringify(data.dictionary);

. . .

postJson('/mvcDictionaryTest', data, function(r) {
    debugger;
}, function(a,b,c) {
    debugger;
});

postJSON js lib function (uses jQuery):

function postJson(url, data, success, error) {
    $.ajax({
        url: url,
        data: JSON.stringify(data),
        type: 'POST',
        contentType: 'application/json; charset=utf-8',
        dataType: 'json',
        success: success,
        error: error
    });
}

The ViewModel object being posted (presumably has a lot more going on than a dictionary):

public class TestViewModel
{
    . . .
    //public Dictionary<string, string> dictionary { get; set; }
    public string dictionary { get; set; }
    . . .
}

The Controller method being posted to:

[HttpPost]
public ActionResult Index(TestViewModel model)
{
    var ser = new System.Web.Script.Serialization.JavascriptSerializer();
    Dictionary<string, string> dictionary = ser.Deserialize<Dictionary<string, string>>(model.dictionary);

    // Do something with the dictionary
}

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