How to format JSON for asp.net webmethod that takes class parameter

Question

I have the following webmethod on my asp.net code behind page:

[WebMethod(EnableSession = true)]
public static bool SaveFailureData(SimpleFailureData data)
{

}

SimpleFailureData is defined as the following:

public class SimpleFailureData
{
    public int Id { get; set; }
    public string Comments { get; set; }
    public double Score { get; set; }
    public double Adjustment { get; set; }
    public List<ShutdownData> ShutdownData { get; set; }
}

public class ShutdownData
{
    public int Id { get; set; }
    public string Description { get; set; }
    public bool CausedShutdown { get; set; }
    public string ShutdownType { get; set; }
}

What I am trying to figure out is how to call this webmethod and format my data so that it is projected/parsed into that class correctly so I can use it. I tried sending a json string to the method, but my breakpoint inside the method was never hit (so I assume the method failed to call due to improper data format).

This is the JSON I tried sending and then calling the method:

json = JSON.stringify( {
    Comments: comments,
    Score: score,
    Adjustment: seAdjustmentValue,
    ShutdownData: breakdowns //this is an array of shutdown objects
});

PageMethods.SaveFailureData(json, function(data) {
    return;
});

But this failed to get inside my method. Any tips on what the JSON format should be so that is properly works for passing a class as a parameter?

Here is the JSON I attempted to send to the method:

{
"Comments":"",
"Score":66.66666666666667,
"Adjustment":0,
"ShutdownData":[{"Id":"401","CausedShutdown":true,"ShutdownType":"NORMAL"}]
}

Answer 1

ok try this

    public static bool SaveFailureData(string sampleFailure)
    {
        JavaScriptSerializer s = new JavaScriptSerializer();
        SimpleFailureData sdata = s.Deserialize<SimpleFailureData>(sampleFailure);
        return true;
    }

    var json = {
                "Comments": "",
                "Score": 66.66666666666667,
                "Adjustment": 0,
                "ShutdownData": [{ "Id": "401", "CausedShutdown": true, "ShutdownType": "NORMAL"}]
            }

            var data = JSON.stringify(json);

            $.ajax({
                type: "POST",
                url: 'Default.aspx/SaveFailureData',
                contentType: 'application/json; charset=utf-8',
                data: "{'sampleFailure' : '" + data + "'}",
               // data: data,
                dataType: 'json',
                success: function (msg) {
                    alert(msg.d);
                },
                error: function (msg) {
                    alert('Error!');
                }
            });

        });

you will get the data in sdata object.