C# List identify case

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hi,

in my example i have a datagrid and some pictureboxes. In the datagrid you can leave your name. With your name, an radiobutton gets generated. If you active your radiobutton you can "bet" on a picturebox (picturebox is moving), which one would be first on the finishline.

Now i had this example solved with arrays, but now with lists(pictureboxes and players are in a list), i dont know how to tell, ok, this radiobutton is active, so its player "jim" who wants to bet on "picbox2".
But i solved this, not on my own. Thats the problem, because i dont really understand what this code means

C#

string name = ((RadioButton)sender).Name;
Player pl = nPlayer.FirstOrDefault(p => p.Name == name);

But this just canges a label.text into the playersname.

For this solution i have:
Class:

-Pictureboox,
-Player,
-Bet

the key funktion is a Method in the class "BET" -> Betnow()
the meth just creates a new bet, and knows on wich dog and from wich player the bet is generated.

But i cant now just tell, like i imagine: nplayer.Betnow(BettingDog, nPlayer, amount)

I have recieved some help from a friend, i know that i have to use a sort of called "Lamda" but im not sure, how this works.

Thank you

Greets Niko

ps.: let me know if you need more expressions! or sample code

Posted 4-Nov-12 20:41pm

niko_tells

Updated 4-Nov-12 21:24pm

v2

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lukeer 5-Nov-12 2:55am

From the user's point of view, lists are quite similar to arrays. In which respect does your array-based solution not work for the list-based one?

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OriginalGriff · Accepted Answer · 2012-11-04T20:53:00

Solution 1

Arrays and lists are very similar - certainly you can access a list by an index in the same way that you access an array:

XML

List<string> list = new List<string>();
list.Add("hello");
list.Add("goodbye");
list.Add("merry christmas");
Console.WriteLine(list[1]);

will compile fine, and will print "goodbye".

So whatever code you used for your arrays, will probably work file with the list.
Without knowing a lot more about what you are doing, and how you are doing it, we can't tell you anything else useful!

Posted 4-Nov-12 20:53pm

OriginalGriff

Comments

niko_tells 5-Nov-12 3:25am

Question is now updated for more details

OriginalGriff 5-Nov-12 3:35am

The code you have provided will work with anything that supports IEnumerable - so arrays and lists will both work exactly the same.
What the code does is look at the sender parameter to the Event handler, and convert it to a Radiobutton, then get the Name of the button. It then uses a Linq method to look through your array or list, or whatever called nplayer, and return the first entry which has a matching Name property, as an instance of your Player class.
All you need to do is identify which dog he wants to bet on, and you are there.
And your code doesn't say how to do that, but it should be the same as the previous version.
Or am I looking at this wrong?

niko_tells 5-Nov-12 3:38am

ah not really right, but close!

i solved to get the betting dog like that:
pl.BetNow(Wete, nHunde.FirstOrDefault(dog => dog.ID == Dog), pl, Bank);

everything is working, about dogs, i cant just identify the players.

OriginalGriff 5-Nov-12 3:50am

You already have your player, don't you - the "pl" is your player, isn't it?

niko_tells 5-Nov-12 3:56am

Ok looks like i have troubles expressing myself, sorry for that!

no i dont have my player, pl is a thought of my friend, and i dont understand why, i think just generated to find it by, like you said, linq

OriginalGriff 5-Nov-12 4:03am

OK, lets go back a stage or two.
You know how to get the Dog, yes? So put that code in a method that returns a Dog.
Now, you have some code in your question which should (probably) return a Player. Does it work?

niko_tells 5-Nov-12 4:11am

no it unfortunally doesnt work:

private void radioButton_Click(object sender, EventArgs e)
{
// Name or Id
string name = ((RadioButton)sender).Name;
Player pl = nPlayer.FirstOrDefault(p => p.Name == name);
PlID = pl.ID;

if (pl == null)
{
MessageBox.Show("no player");
}

label4.Text = pl.Name;
}

by this i get the label4.text right changed!
and now i have thought i set on form1 the int PlID, wich i get from the radiobutton click, cause the code knows the name of the player.

now i got back to the "bet Button":

private void button1_Click(object sender, EventArgs e)
{

Bet = Convert.ToInt32(numericUpDown1.Value);
Dog = Convert.ToInt32(numericUpDown2.Value);

if (Dog != 0 && Bet != 0)
{
//Here is the problem
Player pl = nPlayer.FirstOrDefault(a => a.ID == PlID);

//MessageBox.Show("" + pl.ID);
pl.BetNow(Wete, nHunde.FirstOrDefault(hund => dog.ID == Dog), pl, Bank);

OriginalGriff 5-Nov-12 4:20am

:laugh:
If the Click event handler changes the label4 text to teh right name, then why not just move the player to Class level?
private Player playerBetting;
private void radioButton_Click(object sender, EventArgs e)
{
// Name or Id
string name = ((RadioButton)sender).Name;
playerBetting = nPlayer.FirstOrDefault(p => p.Name == name);
You can then use the playerBetting directly in your button1 click event...
(You will probably want to add some checking to make sure one has been selected)

BTW: Why are you handing the player through to the BetNow method as a parameter, when you already have it as the Player class instance "this" when you execute the method? BetNow is not a static method...

niko_tells 5-Nov-12 4:16am

Oh solved it, but for my opinion to basic solution.

I deklared a var global -> public string Name;

now in the radiobutton instead of:
string name = ((radiobutton)sender).Name;

this

Name = ((radio....).Name;

and back into the bet button:

Player pls = nPlayer.FirstOrDefault(a => a.Name == Name);

OriginalGriff 5-Nov-12 4:20am

See what I said above - you don't need to store the name and look for it each time.

niko_tells 5-Nov-12 4:26am

Thank you mate, now i reccognize what i have done wrong!

Really thanks ;)

OriginalGriff 5-Nov-12 5:39am

You're welcome!