How to make my combobox works?

Question

1.00/5 (1 vote)

See more:

So I made simple calculator using pushbuttons(+,-,*,/)now i want to add a combobox instead of pushbuttons but i dont really now how.I was trying with switch case but it dont work.PLease help.

What I have tried:

I tried switch and i think i can make it with switch but my code is not good.

Posted 6-Feb-22 9:29am

Elmin Hozbo

Updated 7-Feb-22 2:28am

Add a Solution

Comments

OriginalGriff 6-Feb-22 15:44pm

Start by picking a language and a framework - how you do things is not the same in all languages, nor in all frameworks.
So tag your question with what you are actually using, and not a pile of things that might be relevant to you.

Then remember that we can't see your screen, access your HDD, or read your mind - we only get exactly what you type to work with - we get no other context for your project. So show us the relevant code fragments, and explain what it does that you didn't expect or doesn't do that you did.

Imagine this: you go for a drive in the country, but you have a problem with the car. You call the garage, say "it broke" and turn off your phone. How long will you be waiting before the garage arrives with the right bits and tools to fix the car given they don't know what make or model it is, who you are, what happened when it all went wrong, or even where you are?

That's what you've done here. So stop typing as little as possible and try explaining things to people who have no way to access your project!

Use the "Improve question" widget to edit your question and provide better information.

Elmin Hozbo 6-Feb-22 15:55pm

I just dont now how to make my combobox calculate two numbers when i click calculate button.It is just that.

Ali Al Omairi(Abu AlHassan) 7-Feb-22 5:56am

I think you can use the SelectedText property

merano99 6-Feb-22 18:43pm

You tagged the Question with many Tags: C++, C#, QT
The techniques are not compatible and, moreover, one could propose a solution with Win32 or MFC or .NET for C++ alone. It is best to show the existing code and only use tags for techniques that should also be used.
There is not enough information to be able to help here.

Ali Al Omairi(Abu AlHassan) 7-Feb-22 5:53am

Elmin, you made your application with c# windows form, right?
can you post your code so i can see what is wrong with it?

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

KarstenK · Answer 1 · 2022-02-07T01:06:00

Solution 1

Try some searching with a search machine which spitted out some QT5 TUTORIAL QCOMBOBOX - 2020.

Posted 7-Feb-22 1:06am

KarstenK

M Imran Ansari · Answer 2 · 2022-02-07T02:28:00

//C# Windows Form, when working with ComboBox, you have to assign DataSource, ValueMember to access the id of selected text and DisplayMember to show the selected text. You can achieve this using the following code:

public class Operator
{
      public string Id { get; set; }
      public string Sign { get; set; }
}
IList<Operator> Operators = new List<Operator>();
Operators.Add(new Operator() { Id = "1", Sign = "+" });
Operators.Add(new Operator() { Id = "2", Sign = "-" });
Operators.Add(new Operator() { Id = "3", Sign = "*" });
Operators.Add(new Operator() { Id = "4", Sign = "/" });

comboBox.DataSource = Operators;
comboBox.ValueMember = "Id";
comboBox.DisplayMember = "Sign";
//SelectedValue will return the selected value Id and SelectedText will return Text.
switch (comboBox.SelectedValue) 
{
    case "1": //+
        // You will get the 'Id' of the selected sign
        break;
    case "2": // -
        // Your Code
        break;
    case "3": // *
        // Your Code
        break;
    case "4": // /
        // Your Code
        break;
}