CODEWITHSUNDEEP
c#listunity-game-enginestruct
Csharpest
Csharpest

Reputation: 1268

Get specific values of a struct/List

I'm creating a game in Unity3D + C#.

What I've got at the moment: an SQL datatable, consisting of 8 columns holding a total of 3 entries and a list "_WeapList" that holds every entry (as shown below).

public struct data
{
    public string Name;
    public int ID, dmg, range, magazin, startammo;
    public float tbtwb, rltimer;
}

List<data> _WeapList;
public Dictionary<int, data>_WeapoList; //probable change    

[...]

//reading the SQL Table + parse it into a new List-entry
while (rdr.Read())
    {
        data itm = new data();

        itm.Name = rdr["Name"].ToString();
        itm.ID = int.Parse (rdr["ID"].ToString());
        itm.dmg = int.Parse (rdr["dmg"].ToString());
        itm.range = int.Parse (rdr["range"].ToString());
        itm.magazin = int.Parse (rdr["magazin"].ToString());
        itm.startammo = int.Parse (rdr["startammo"].ToString());
        itm.tbtwb = float.Parse(rdr["tbtwb"].ToString());
        itm.rltimer = float.Parse(rdr["rltimer"].ToString());

        _WeapList.Add(itm);
        _WeapoList.Add(itm.ID, itm);//probable change
    }

Now I want to create a "Weapon"-Class that will have the same 8 fields, feeding them via a given ID

How do I extract the values of a specific item (determined by the int ID, which is always unique) in the list/struct?

public class Weapons : MonoBehaviour 
{

    public string _Name;
    public int _ID, _dmg, _range, _magazin, _startammo;
    public float _tbtwb, _rltimer;

    void Start()
    {//Heres the main problem
        _Name = _WeapoList...?
        _dmg = _WeapoList...?
    }
}

Upvotes: 3

Views: 3632

Answers (3)

Serlite
Serlite

Reputation: 12258

If your collection of weapons may become quite large or you need to frequently look up weapons in it, I would suggest using a Dictionary instead of a List for this (using the weapon ID as the key). A lookup will be much quicker using a Dictionary key than searching through a List using a loop or LINQ.

You can do this by modifying your code to do this as follows:

public Dictionary<int, data>_WeapList;

[...]

//reading the SQL Table + parse it into a new List-entry
while (rdr.Read())
{
    data itm = new data();

    itm.Name = rdr["Name"].ToString();
    itm.ID = int.Parse (rdr["ID"].ToString());
    itm.dmg = int.Parse (rdr["dmg"].ToString());
    itm.range = int.Parse (rdr["range"].ToString());
    itm.magazin = int.Parse (rdr["magazin"].ToString());
    itm.startammo = int.Parse (rdr["startammo"].ToString());
    itm.tbtwb = float.Parse(rdr["tbtwb"].ToString());
    itm.rltimer = float.Parse(rdr["rltimer"].ToString());

    _WeapList.Add(itm.ID, itm);//probable change
}

Then, to access elements on the list, just use the syntax:

_WeapList[weaponID].dmg; // To access the damage of the weapon with the given weaponID

Guarding against invalid IDs:

If there's a risk of the weaponID supplied not existing, you can use the .ContainsKey() method to check for it first before trying to access its members:

if (_WeapList.ContainsKey(weaponID))
{
    // Retrieve the weapon and access its members
}
else
{
    // Weapon doesn't exist, default behaviour
}

Alternatively, if you're comfortable using out arguments, you can use .TryGetValue() instead for validation - this is even quicker than calling .ContainsKey() separately:

data weaponData;
if (_WeapList.TryGetValue(weaponID, out weaponData))
{
    // weaponData is now populated with the weapon and you can access members on it
}
else
{
    // Weapon doesn't exist, default behaviour
}

Hope this helps! Let me know if you have any questions.

Upvotes: 4

sujith karivelil
sujith karivelil

Reputation: 29026

Let specificWeapon be a weapon to be searched in the list, then you can use the following code to select that item from the list of weapons, if it is not found then nullwill be returned. Hope that this what you are looking for:

var selectedWeapon =  WeapList.FirstOrDefault(x=> x.ID == specificWeapon.ID);
if(selectedWeapon != null)
{
    // this is your weapon proceed
}
else
{
   // not found your weapon
}

Upvotes: 2

Ahmar
Ahmar

Reputation: 3867

You can use LINQ to search specific object through weaponId

var Weapon =  _WeapList.FirstOrDefault(w=> w.ID == weaponId);

Upvotes: 1

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