Problem with classes and interface

secerka secerovic

Hello everyone!

I'm learning class amd interface and I have a problem.

This is just an example where I try to learn.

I have this interface and classes.

class Candidate
{
string Name { get; set; }
List Skills { get; }
}

public class Skill
{
public string Name { get;set; }
public int Level { get;set; }

public Skill(string name, int level)
{
this.Name = name;
this.Level = level;
}

interface ICandidateSearch //interface for search
{
List Find(List skills);
List Find(List skills);

}

I would create a CandidateSearch class, which impliments
the interface and holds the list of candidates to be searched.

Each candidate has one name and more Skills and SkillLevels.

Example:

Name="Bob B.", Skill="SQL","MVC","C#", SkillLevels= 5,3,4

It is not possible to be

Bob B. C# 4

Bob B. SQL 5

because it can be done about the two men with the same name
and should be a man with more skill and skillLevel.

The point is that one kanditat has more skill and skillLevel.

I would anyone want to help me to write and publish ConsoleApplication cod.

I said that I teach class and interface.
Much easier for me to understand the whole cod than just individual parts.

An example of how an application should be:

Suppose we have a list of three candidates!

Name="Bob B.", Skill="SQL","MVC","C#", SkillLevels= 4,3,5

Name="John K.", Skill="SharePoint","SQL","C#", SkillLevels= 3,5,5

Name="Peter B.", Skill="SQL","ASP.NET","XML", SkillLevels= 5,4,4

First Search:

Our input:

Skill: C#
SkillLevels: 5

output:

Bob B.,John K.

Two Search:

Our input:

Skill: SQL
SkillLevels: 5

output:

John K.,Peter B.

7 Replies

Know the answer? Post it — somebody with the same question will find it here.

Vulpes15y ago
Accepted answer
When you add the line:

list4.Add(new Skill("MVC", 2));

there are now no candidates who have both skills at the appropriate levels and so a blank line is printed to the console. The second search is not affected and so prints (as before):

John K.,Peter B.
Vulpes15y ago
I've never used NUnit but there's an article about using it here on this site:

http://www.c-sharpcorner.com/UploadFile/5ce05b/5821/
secerka secerovic15y ago
Vulpes thank you so much!

I used the first code that you sent to me, I just made a change here

foreach (Skill cs in c.Skills)
{
if (s.Name == cs.Name && s.Level <= cs.Level) //change
{

Because I'm begginer I realized along with writing code I need to write tests.
So I started to learn Nunit tests.I use wrox literature and www.nunit.org.
Now I'm trayng to write test for this specific cod.
Unfortunately I couldn't do it. :(
I would ask you if you can help me with writing tests for this kod.
I need fo find Bob B with assert in frst test with this certain parameters(skill and skillLevel)
and in another test I need to find more people, maybe two or three people with this parameters.

How to check whether these are people who I'm searching for?
Vulpes15y ago
If you want to return candidates which have certain skills, but regardless of skill level, then you can use the overload of the Find() method which takes a List rather than a List as an argument.

For example, if you insert this code after the stuff for list5:

Console.WriteLine();

List list6 = new List();
list6.Add("C#");
list6.Add("MVC");
results = candSearch.Find(list6);
for(int i = 0; i < results.Count; i++)
{
Console.Write(results[i].Name);
if (i < results.Count - 1) Console.Write(",");
}

then you should get the line:

Bob B.

as he's the only candidate that has the C# and MVC skills.

If you wanted to return candidates who have the necessary skills but at a level which is within 1 of the input level, then you have two choices:

1. Create another override of the Find() method which takes a List argument and pass it a second bool argument, levelWithinOne, which, of course, would be either true or false. However, if you did this, then it would no longer correspond exactly with your interface unless you added a third overload to that as well.

2. Alter the existing Find() method, so that it always returns candidates whose skill levels are within one of the input level.
secerka secerovic15y ago
Vulpes thank you again.

I Understand that with this line of code I am looking for candidates who do not exist.
Could you write me code that would put in my list candidates with the first greater or the first lower skillLevel?

For example of this skill MVC and skiliLevel 2 that the list printed Bob B. who has skill MVC but skillLevel 2.

Thank you very much for helping me with this practical advice!
secerka secerovic15y ago
Vulpes Thank you very much to the written code!

Essentially to be sought applications.

This application gives the result
Bob B., John K.
John K., Peter B.

That's fine!

But I'm in

CandidateSearch candSearch = new CandidateSearch(candidates);
added another list4.Add(new Skill("MVC", 2));

wanting to change my code and try to understand what you have done.

After this result is John K., Peter B.

Can you explain to me what did I do?

Can you write the code as I would with this addition as a result he and Bob B. ?

I said that I teach classes and interfaces.

I am grateful to you for your help.
Vulpes15y ago
Try the following:

using System;
using System.Collections.Generic;

class Candidate
{
public string Name { get; set; }
public List Skills { get; private set;}

public Candidate(string name, List skills)
{
Name = name;
Skills = skills;
}
}

public class Skill
{
public string Name { get;set; }
public int Level { get;set; }

public Skill(string name, int level)
{
this.Name = name;
this.Level = level;
}
}

interface ICandidateSearch //interface for search
{
List Find(List skills);
List Find(List skills);
}

class CandidateSearch : ICandidateSearch
{
List candidates;

public List Find(List skills)
{
List results = new List();
foreach(Candidate c in candidates)
{
bool match = true;

foreach(string name in skills)
{
bool found = false;

foreach(Skill cs in c.Skills)
{
if(name == cs.Name)
{
found = true;
break;
}
}

if (!found)
{
match = false;
break;
}
}

if (match) results.Add(c);
}

return results;
}


public List Find(List skills)
{
List results = new List();

foreach(Candidate c in candidates)
{
bool match = true;

foreach(Skill s in skills)
{
bool found = false;

foreach(Skill cs in c.Skills)
{
if(s.Name == cs.Name && s.Level == cs.Level)
{
found = true;
break;
}
}

if (!found)
{
match = false;
break;
}
}

if (match) results.Add(c);
}

return results;
}

public CandidateSearch(List candidates)
{
this.candidates = candidates;
}
}

class Program
{
static void Main()
{
List candidates = new List();
List list1 = new List();
list1.Add(new Skill("SQL", 4));
list1.Add(new Skill("MVC", 3));
list1.Add(new Skill("C#", 5));
Candidate c1 = new Candidate("Bob B.", list1);
candidates.Add(c1);

List list2 = new List();
list2.Add(new Skill("SharePoint", 3));
list2.Add(new Skill("SQL", 5));
list2.Add(new Skill("C#", 5));
Candidate c2 = new Candidate("John K.", list2);
candidates.Add(c2);

List list3 = new List();
list3.Add(new Skill("SQL", 5));
list3.Add(new Skill("ASP.NET", 4));
list3.Add(new Skill("XML", 4));
Candidate c3 = new Candidate("Peter B.", list3);
candidates.Add(c3);

CandidateSearch candSearch = new CandidateSearch(candidates);
List list4 = new List();
list4.Add(new Skill("C#", 5));
List results = candSearch.Find(list4);
for(int i = 0; i < results.Count; i++)
{
Console.Write(results[i].Name);
if (i < results.Count - 1) Console.Write(",");
}

Console.WriteLine();

List list5 = new List();
list5.Add(new Skill("SQL", 5));
results = candSearch.Find(list5);
for(int i = 0; i < results.Count; i++)
{
Console.Write(results[i].Name);
if (i < results.Count - 1) Console.Write(",");
}

Console.ReadKey();
}
}