protected override Expression VisitColumn(ColumnExpression column)
{
ParameterExpression fieldReader;
int index;
if (this.scope != null && this.scope.TryGetValue(column, out fieldReader, out index))
{
MethodInfo method = FieldReader.GetReaderMethod(column.Type);
columnTypes[index] = column.Type;
return(Expression.Call(fieldReader, method, Expression.Constant(index)));
}
else
{
System.Diagnostics.Debug.Fail(string.Format("column not in scope: {0}", column));
}
return(column);
}