Question

I have been attempting to write a reusable generic method for lookups on a DataTable. What I have so far:

private static IEnumerable<DataRow> GetRow<FType>(string Tablename, 
    string Fieldname, FType Match)
{
    var result = from row in dataSet.Tables[Tablename].AsEnumerable()
                 where row.Field<FType>(Fieldname) == Match
                 select row;

    return result;
}

However, we don’t like the row.Field<FType>(Fieldname) == Match.

Any ideas on what I’m suppose to do to fix this? I get: Operator ‘==’ cannot be applied to FType and FType.

Answer 1

Replace == Match with .Equals(Match) and you should be good. I’ve thrown in a null check in case the values could be null.

private static IEnumerable<DataRow> GetRow<FType>(string Tablename, string Fieldname, FType Match)
{
    var result = from row in dataSet.Tables[Tablename].AsEnumerable()
                 where row.Field<FType>(Fieldname) != null
                 && row.Field<FType>(Fieldname).Equals(Match)
                 select row;

    return result;
}