Type System.String is not supported of an array

Question

I've been reading threads about deserializing json and tried a number of ways to achieve it but can't seem to make this work. Here's what I've done so far:

Class

public class oVesselMovement : oVMLocation, IWPConditions, IVessel, IStatus      
{
     public int wpID { get; set; }
     public string charts { get; set; }
     public string latNS { get; set; }
     public string longEW { get; set; }
     public string course { get; set; }
     public double toNextWPNM { get; set; }
     public double toGoNM { get; set; }
     public string eda { get; set; }
     public string eta { get; set; }
}

Root Class

public class RootVM
{
    public List<oVesselMovement> jsnObj { get; set; }
}

JSON

{"jsnObj":[{"vmID":"1","charts":"2111","latNS":"10°29.10 N","longEW":"123°25.83 E","course":"420°","toNextWPNM":0,"toGoNM":"27","eda":"12-15-2016","eta":"11:01"},{"vmID":"2","charts":"2211","latNS":"11°29.10 N","longEW":"124°25.83 E","course":"420°","toNextWPNM":0,"toGoNM":"27","eda":"12-15-2016","eta":"11:01"}]}

Deserialization

[WebMethod]
public void saveVMDT(string jsnObj)
{
    RootVM rootObj = new JavaScriptSerializer().Deserialize<RootVM>(jsnObj);
    foreach (var obj in rootObj.jsnObj)
    {
        try
        {
            ...
    }

I've also tried converting the List<oVesselMovement> jsnObj { get; set; } to oVesselMovement[] jsnObj but to no avail.

I keep getting this error:

"{"Message":"Type \u0027System.String\u0027 is not supported for deserialization of an array."....

Any help would be appreciated.

Answer 1

toGoNM is a string, not a number. You need to use the proper types, fix it either on the C# side, or the JSON side. You have wpID in the C# class, but vmID in the JSON; and again, with the wrong type.