C#•13mo ago

How can I insert my sortedlist into a listbox?

I am new to C# and currently using a sortedlist<string, int> in order to store values that I need to display in a listbox (according to my uni, this is how I need to do it). I have tried quite a few things however I am struggling to get both the key AND value into a listbox. Would anybody be able to give me some guidance on how I can go about doing this?

32 Replies

TheRanger•13mo ago

listbox in winforms? wpf? web site?

jjsuttonOP•13mo ago

Apologies, it is in winforms

TheRanger•13mo ago

try

yourlistBox.DataSource = yourSortedList;
yourlistBox.DataTextField = "Value";
yourlistBox.DataValueField = "Key";
yourlistBox.DataBind();

yourlistBox.DataSource = yourSortedList;
yourlistBox.DataTextField = "Value";
yourlistBox.DataValueField = "Key";
yourlistBox.DataBind();

yourlistBox.DataSource = new BindingSource(yourSortedList, null); 
yourlistBox.ValueMember = "Key";
yourlistBox.DisplayMember = "Value";

yourlistBox.DataSource = new BindingSource(yourSortedList, null); 
yourlistBox.ValueMember = "Key";
yourlistBox.DisplayMember = "Value";

jjsuttonOP•13mo ago

First one does not contain definitions for all but DataSource Second one does show my value but not the key

TheRanger•13mo ago

ah lol just noticed its swapped, just swap it make it show the key instead

jjsuttonOP•13mo ago

lol, now the key is showing but the value is not

TheRanger•13mo ago

that is the point you want to display both at the same time?

jjsuttonOP•13mo ago

Correct Ive been able to show one at a time, however been struggling to make it show both

TheRanger•13mo ago

unsure, try removing these lines

yourlistBox.ValueMember = "Key";
yourlistBox.DisplayMember = "Value";

yourlistBox.ValueMember = "Key";
yourlistBox.DisplayMember = "Value";

jjsuttonOP•13mo ago

Displays the value

TheRanger•13mo ago

hmm, i recall DataSource can accept a list directly

jjsuttonOP•13mo ago

How I originally have been doing it is through .ToList, however that only displays the value lsbScores.DataSource = scores.ToList();

TheRanger•13mo ago

yourlistBox.DataSource = yourSortedList.Select(x => new KeyValuePair<string,int>($"{x.Key} {x.Value}", x.Value));
yourlistBox.ValueMember = "Value";
yourlistBox.DisplayMember = "Key";

yourlistBox.DataSource = yourSortedList.Select(x => new KeyValuePair<string,int>($"{x.Key} {x.Value}", x.Value));
yourlistBox.ValueMember = "Value";
yourlistBox.DisplayMember = "Key";

jjsuttonOP•13mo ago

TheRanger•13mo ago

ok put .ToList() at the end yourlistBox.DataSource = yourSortedList.Select(x => new KeyValuePair<string,int>($"{x.Key} {x.Value}", x.Value)).ToList();

jjsuttonOP•13mo ago

This works, thank you so much for that... Ill take some time to understand why it works as well. If I have any questions ill message you if you dont mind?

TheRanger•13mo ago

well thats simple, KeyValuePair has 2 columns, Key and Value DisplayMember selects which Column to display for the user

jjsuttonOP•13mo ago

Right, but its set to key, so why does it display both the value and key?

TheRanger•13mo ago

it does not the value is actually concatenated in the key by this line yourSortedList.Select(x => new KeyValuePair<string,int>($"{x.Key} {x.Value}", x.Value));

jjsuttonOP•13mo ago

that line is setting x to be key:value correct?

TheRanger•13mo ago

you see, SortedList<string,int> is actually a collection of KeyValuePair<string,int>

jjsuttonOP•13mo ago

Im not suuuper familiar with lambdas yet, so trying to understand that line specifically lol

TheRanger•13mo ago

say u have a key called Foo with a value of 1

jjsuttonOP•13mo ago

This I understand

TheRanger•13mo ago

all i did was converting the key to Foo 1

jjsuttonOP•13mo ago

Yeah, im understanding that

TheRanger•13mo ago

so now the Key of this element is Foo 1 instead of Foo

jjsuttonOP•13mo ago

it hasnt changed my actual key to foo 1 though right? lol

TheRanger•13mo ago

in the sorted list itself? no

jjsuttonOP•13mo ago

ok cool Ah I see, ur initializing a new keyvaluepair and setting that to be my sortedlists key+value in the key right?

TheRanger•13mo ago

yes

jjsuttonOP•13mo ago

coool im understanding then thanks so much I appreciate it

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How can I insert my sortedlist into a listbox?