Question

Need to send the values of a Sqlite table to the server via an AJAX call to a web service. I can’t figure out how to package the rows of this table in a way that the web service will accept it.

Web Method Signature

[WebMethod]
    public void CVW(string[][] qAndA)
    {}

Client Side

var qAndA = new Array();
tx.executeSql("Select * From CVW Where CallNumber=?", [call], function (tx, result) {
                        var i = 0;
                        $.each(result.rows, function () {
                            qAndA[i] = result.rows.item(i);
                            i++;
                        });
$.ajax({
                            type: "POST",
                            dataType: "json",
                            contentType: "application/json",
                            url: "Service.asmx/CVW",
                            data: JSON.stringify({ qAndA: qAndA }),
                            success: function (data) {
                            },
                            error: function (xhr, status, error) {
                                var err = eval("(" + xhr.responseText + ")");
                                alert(err.Message);
                            }
                        });
                    }, onSQLError);

This gives me No parameterless constructor defined for type System.String. I’ve tried changing the web method parameter to just string[] and List and same thing.

When I look at what is being sent in Fire Bug I see that it is sending over as Object[object Object][object Object][object Object]... for as many [object Object] as there are rows returned in the Sqlite Query. What is the corresponding type in C# that I can use as my parameter type?

EDIT: Final Solution

In the javascript I had to change

data: JSON.stringify({ qAndA: qAndA }),

to

var json = JSON.stringify(qAndA);
data: JSON.stringify({ qAndA: json });

and changed the Web Method thusly

 [WebMethod]
    public void CVW(string qAndA)

JavaScriptSerializer ser = new JavaScriptSerializer();
List<CVWQuestion> list = ser.Deserialize<List<CVWQuestion>>(qAndA);

[Serializable]
public class CVWQuestion
{
    public string CallNumber {get;set;}
    public string Question { get; set; }
    public string P1 { get; set; }
    public string P2 { get; set; }
    public string P3 { get; set; }
    public string P4 { get; set; }
    public string P5 { get; set; }
    public string P6 { get; set; }
}

Answer 1

Please see my edited post for the code that finally worked for me. Found in large part to @SteveB, but never submitted as answer so I couldn’t accept it.