public static Expression <Func <T, bool> > Or <T>(this Expression <Func <T, bool> > exp_left, Expression <Func <T, bool> > exp_right)
{
var candidateExpr = Expression.Parameter(typeof(T), "candidate");
var parameterReplacer = new ParameterReplacer(candidateExpr);
var left = parameterReplacer.Replace(exp_left.Body);
var right = parameterReplacer.Replace(exp_right.Body);
var body = Expression.Or(left, right);
return(Expression.Lambda <Func <T, bool> >(body, candidateExpr));
}
public static Expression <Func <T, int, bool> > And <T>(this Expression <Func <T, int, bool> > exp_left, Expression <Func <T, int, bool> > exp_right)
{
var candidateExpr = Expression.Parameter(typeof(T), "candidate");
var parameterReplacer = new ParameterReplacer(candidateExpr);
var left = parameterReplacer.Replace(exp_left.Body);
var right = parameterReplacer.Replace(exp_right.Body);
var indexExpr = Expression.Parameter(typeof(int), "index");
var parameterReplacer2 = new ParameterReplacer(indexExpr);
left = parameterReplacer2.Replace(exp_left.Body);
right = parameterReplacer2.Replace(exp_right.Body);
var body = Expression.And(left, right);
return(Expression.Lambda <Func <T, int, bool> >(body, candidateExpr, indexExpr));
}