How to get the values of selected checkboxes and pass to WPF C# as string array

Question

0.00/5 (No votes)

See more:

I want to select the checkboxes from below form (wpf) and pass the value to C# as string array.
(output should be like this: TEST A, TEST C, TEST D)

in my C# code, on clicking OK button, the checked values should be passed and output as string.

Here is my sample xaml file

<listbox x:name="Options" selectionmode="Multiple" height="287" margin="14,12,10,0" verticalalignment="Top" rendertransformorigin="0.5,0.5"> <checkbox content="TEST A" ischecked="False" fontsize="15" height="35" width="190">
<checkbox content="TEST B" ischecked="False" fontsize="15" height="35" width="100">
 <checkbox content="TEST C" ischecked="False" fontsize="15" height="35" width="100">
<checkbox content="TEST D" ischecked="False" fontsize="15" height="35" width="100" rendertransformorigin="1.923,3.075">

Can anyone share example code to do it. I am new user to wpf and C#.
Any help appreciated.

What I have tried:

using below code i can get only one item at a time, but i want to get all checked items as a string list with "," separated.

private void OptOK_Click(object sender, RoutedEventArgs e)
{ 
    foreach (CheckBox item in Options.Items) 
    { 
        if (item.IsChecked == true)
        { 
            string ItemValue = item.Content.ToString();
            MessageBox.Show((ItemValue + "is checked."));
        } 
    } 
}

Posted 9-Sep-20 19:43pm

Member 14925121

Updated 9-Sep-20 21:10pm

Garth J Lancaster

v2

Add a Solution

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)

Member 12901943 · Answer 1 · 2020-09-09T21:07:00

It should be obvious you'd only get one at a time - the message box is displayed each time you find a checked checkbox.

You just need to concatenate all the checkbox strings in the loop before you display the message box. Something like:

private void OptOK_Click(object sender, RoutedEventArgs e)
{ 
    string ItemValue = "";

    foreach (CheckBox item in Options.Items) 
    { 
        if (item.IsChecked == true)
        { 
            if (itemValue != "") {itemValue = itemValue + ", ";}
 
            ItemValue =  ItemValue + item.Content.ToString();
        } 
    }

    MessageBox.Show((ItemValue + " is checked."));
}

TheRealSteveJudge · Answer 2 · 2020-09-09T21:11:00

Here is an example how to accomplish this.

MainWindow.xaml

XML

<Window x:Class="CheckBoxTest.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:CheckBoxTest"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition></RowDefinition>
            <RowDefinition></RowDefinition>
        </Grid.RowDefinitions>
        <ListBox Name="ListBoxOptions">
            <CheckBox Content="TEST A"></CheckBox>
            <CheckBox Content="TEST B"></CheckBox>
            <CheckBox Content="TEST C"></CheckBox>
            <CheckBox Content="TEST D"></CheckBox>
        </ListBox>
        <Button Grid.Row="1"
                Width="100"
                Height="25"
                Margin="5"
                Name="ButtonShowResults"
                Content="Show Results"
                Click="ButtonShowResults_OnClick"></Button>
    </Grid>
</Window>

MainWindow.xaml.cs

C#

using System.Linq;
using System.Windows;
using System.Windows.Controls;

namespace CheckBoxTest
{
    public partial class MainWindow
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void ButtonShowResults_OnClick(object sender, RoutedEventArgs e)
        {
            var selectedItems = ListBoxOptions.Items.Cast<CheckBox>().Where(x => x.IsChecked == true).Select(x => x.Content).ToList();

            MessageBox.Show(string.Join("\n", selectedItems));
        }
    }
}

Short explanation:
First of all the Items of the ListBox which are just objects are cast to CheckBoxes as you want to access their Content properties.
Then these CheckBoxes are filtered by IsChecked == true.
Then their Contents which is just an IEnumerable will be converted to a List.
Finally the List will be concatenated with Line Feeds so that the MessageBox will show
e.g.
TEST A
TEST B

If you want to have a comma separated List instead
you can replace the separator like this.

C#

string.Join(",", selectedItems)

How to get the values of selected checkboxes and pass to WPF C# as string array

2 solutions

Solution 1

Solution 2

Add your solution here

Preview 0