Question

I’m getting the following error when trying to get the sum in this Linq query:

InvalidCastException was unhandled. Specified cast is not valid.

I used the DataType property to triple check is that column is in fact a Double, and it is.

foreach (DataColumn item in _dttMasterViewTransaction.Columns)
{
    if (item.ColumnName == "Dr")
    {
        //Outputs: System.Double!
        MessageBox.Show(item.DataType.ToString());
    }
}

var datos = _dttMasterViewTransaction.AsEnumerable().Where(r => (int)r["Entity"] == FundsID).Select(r => new EntityJESummary()
{
    JEId = (int)r["JE ID"],
    JEGroupingId = (int)r["JE Group"],
    PartnershipId = (int)r["Entity"],
    BookingDate = Convert.ToDateTime(r["GL Date"]),
    EffectiveDate = Convert.ToDateTime(r["Effective Date"]),
    Allocated = Convert.ToBoolean(r["Allocated"]),
    JEEstate = (int)r["JE State"],
    JEComments = r["JE Comments"].ToString(),

    Debit = _dttMasterViewTransaction.AsEnumerable().Where(s => (int)r["Entity"] == FundsID).Sum(s => (double)s["Dr"]),
    Credit = _dttMasterViewTransaction.AsEnumerable().Where(s => (int)r["Entity"] == FundsID).Sum(s => (double)s["CR"])

}).First();

Any suggestions on why this could occur?

Answer 1

Are any of the entries null for that field? or are there some that are not doubles?

we’d need to see more data to get a better answer…