Reputation: 4039

Expression Creator Program - C#

I need to write a program in C# that facilitates the input of logical expression.

There is an operator set which includes >, <, >=, <=, =, != There are AND, OR and parenthesis.

There is going to be a menu that user can select operators and input the values to compare so that the output will be something like:

(A > 5) OR (B = 10 AND C != 50)

How would you suggest to do it in a way that user always has to input valid values. Do you know any articles about it?

Upvotes: 0

Answers (6)

Morten

Reputation: 3854

Maybe Operator overloads are what you look for???

Something like:

internal class Person
{
    public int Age { get; set; }

    public static bool operator >(Person thisPerson, int compareValue)
    {
        return thisPerson.Age > compareValue;
    }

    public static bool operator <(Person thisPerson, int compareValue)
    {
        return thisPerson.Age < compareValue;
    }

}

Upvotes: 0

weismat

Reputation: 7411

I have used the Windows Workflow Activities Rule engine in the past. It gives you an Excel/Access style GUI to define rules based on objects, but might offer a lot more than you need.
Have a look here as a start.

Upvotes: 0