internal static Expression <Func <T, bool> > Or <T>(Expression <Func <T, bool> > e1, Expression <Func <T, bool> > e2)
{
Expression <Func <T, bool> > expression = null;
if (e1 == null)
{
expression = e2;
}
else if (e2 == null)
{
expression = e1;
}
else
{
var visiteur = new ParameterRebinder(e1.Parameters[0]);
e2 = (Expression <Func <T, bool> >)visiteur.Visit(e2);
var body = Expression.Or(e1.Body, e2.Body);
expression = Expression.Lambda <Func <T, bool> >(body, e1.Parameters[0]);
}
return(expression);
}
