[Solved] 500 Internal Server Error when passing Array to WebMethod using jQuery Ajax

Hi Corobori,

Check the below example. You need to set the data like below.

JavaScript

<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script type="text/javascript">
    $(function () {
        var ChangedObjects = [];
        var sentData = { id: 61, orden: 19 };
        ChangedObjects.push(sentData);
        sentData = { id: 59, orden: 16 };
        ChangedObjects.push(sentData);

        $.ajax({
            url: '<%=ResolveUrl("Default.aspx/SaveData") %>',
            type: 'POST',
            contentType: 'application/json; charset=utf-8',
            dataType: 'json',
            data: JSON.stringify({ sData: ChangedObjects }),
            success: function (data, textStatus, xhr) {
                console.log("Saved Successefully");
            },
            error: function (xhr, textStatus, errorThrown) {
                console.log('Error in Operation');
            }
        });
    });
</script>

Code

C#

public class Fotos
{
    private int _numero;
    public int id
    {
        get { return _numero; }
        set { _numero = value; }
    }
    private int _orden;
    public int orden
    {
        get { return _orden; }
        set { _orden = value; }
    }
}


[System.Web.Services.WebMethod()]
public static bool SaveData(Fotos[] sData)
{
    string sql = "";
    foreach (var foto in sData)
    {
        var id = foto.id;
        var order = foto.orden;
    }

    return true;
}

VB.Net

Public Class Fotos
    Private _numero As Integer
    Public Property id As Integer
        Get
            Return _numero
        End Get
        Set(ByVal value As Integer)
            _numero = value
        End Set
    End Property
    Private _orden As Integer
    Public Property orden As Integer
        Get
            Return _orden
        End Get
        Set(ByVal value As Integer)
            _orden = value
        End Set
    End Property
End Class

<Services.WebMethod()>
Public Shared Function SaveData(ByVal sData As Fotos()) As Boolean
    Dim sql As String = ""
    For Each foto In sData
        Dim id = foto.id
        Dim order = foto.orden
    Next

    Return True
End Function