Text of Text Box Based on ComboBox Item in WPF

Question

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I have a ComboBox in my application in which ComboBoxItems are "Yes" and "No".

I want to assign the text of my TextBox as "cleared" if if the selected ComboBoxItem is "Yes" and "not cleared" if the selected ComboBoxItem is "No". How do I do that in WPF?

Posted 10-Feb-11 0:12am

amitkarnik2211

Updated 10-Feb-11 11:46am

AspDotNetDev

v2

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6 solutions

Solution 3

Assuming first item is "Yes" and second "No", you do something like this:

C#

MyComboBox.SelectionChanged += (sender, eventArgs) => {
    if (cb.SelectedIndex == 0)
        this.MyTextBox.Text = "Cleared";
    else
        this.MyTextBox.Text = "No, not cleared!";
}; //MyComboBox.SelectionChanged

That's it.

—SA

Posted 10-Feb-11 6:24am

Sergey Alexandrovich Kryukov

Updated 10-Feb-11 6:25am

v2

Solution 5

Are you looking for VisualChild?

http://www.dotnetfunda.com/codes/code821-find-a-childelement-from-dependancyobject.aspx[^]

Check this.:rose:

Posted 10-Feb-11 7:15am

Abhishek Sur

Comments

AspDotNetDev 10-Feb-11 13:21pm

Huh?

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AspDotNetDev · Accepted Answer · 2011-02-10T06:49:00

You can do this with a DataTrigger:

XML

<Grid>
    <ComboBox VerticalAlignment="Top" HorizontalAlignment="Left" SelectedIndex="0" Name="cboBool">
        <ComboBoxItem>Yes</ComboBoxItem>
        <ComboBoxItem>No</ComboBoxItem>
    </ComboBox>
    <TextBox VerticalAlignment="Bottom">
        <TextBox.Style>
            <Style>
                <Style.Triggers>
                    <DataTrigger Binding="{Binding ElementName=cboBool, Path=SelectedValue.Content}" Value="Yes">
                        <Setter Property="TextBox.Text" Value="Cleared" />
                    </DataTrigger>
                    <DataTrigger Binding="{Binding ElementName=cboBool, Path=SelectedValue.Content}" Value="No">
                        <Setter Property="TextBox.Text" Value="Not Cleared" />
                    </DataTrigger>
                </Style.Triggers>
            </Style>
        </TextBox.Style>
    </TextBox>
</Grid>

Espen Harlinn · Accepted Answer · 2011-02-10T10:50:00

Solution 6

Assuming that I have a combobox named MyComboBox

<TextBox Text="{Binding Path=SelectedValue, ElementName=MyComboBox}" />

I can't think of any way to make it simpler :)

Update
Populate the combobox using a collection with an element type with two text properties one for the cobobox and one for the texbox. override the ToString() on the element type to return the text for the TextBox, and use an ItemTemplate to display the correct text in the combobox.

Regards
Espen Harlinn

Posted 10-Feb-11 10:50am

Espen Harlinn

Updated 10-Feb-11 10:59am

v2

Comments

Sergey Alexandrovich Kryukov 10-Feb-11 17:00pm

Good solution (a 5), even though it won't show arbitrary text in this text box as OP wanted.
I did exactly what OP wanted, but I would not design that way because I would not like those ad-hoc text data.
--SA

Espen Harlinn 10-Feb-11 17:08pm

Thank you SAKryukov!

johannesnestler · Accepted Answer · 2011-02-10T04:23:00

I did a quick example - but this should be easy - improve your basics!

Start with an empty WPF-Project
Replace the markup in Window1.xaml with this:

XML

<Window x:Class="WpfApplication.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="300" Width="300">
    <Grid>
        <ComboBox Height="23" Margin="46,30,112,0" Name="comboBox1" VerticalAlignment="Top" SelectionChanged="comboBox1_SelectionChanged" />
        <TextBox Margin="46,125,112,114" Name="textBox1" />
    </Grid>
</Window>

... and replace the code in Window1.xaml.cs with:

C#

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

namespace WpfApplication
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();

            comboBox1.Items.Add("Yes");
            comboBox1.Items.Add("No");
        }

        private void comboBox1_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            textBox1.Text = (comboBox1.SelectedItem != null && comboBox1.SelectedItem.ToString() == "Yes") ?
                "cleared" :
                "not cleared";
        }
    }
}

m@dhu · Accepted Answer · 2011-02-10T00:32:00

Solution 1

This simple code works

C#

if (comboBox1.SelectedItem == "Yes")
            {
                textBox1.Text = "cleared";
            }
            else { textBox1.Text = "not cleared"; }

Posted 10-Feb-11 0:32am

m@dhu

Comments

amitkarnik2211 10-Feb-11 7:04am

Hi Thanks For the Reply I tried the Same But is Giving this Error

(Possible unintended reference comparison; to get a value comparison, cast the left hand side to type 'string')

m@dhu 10-Feb-11 7:49am

if (comboBox1.SelectedItem.Equals("yes"))
{
textBox1.Text = "cleared";
}
else{ textBox1.Text = "not cleared"; }

amitkarnik2211 10-Feb-11 8:18am

Hi Tried This way But after Selection it is just showinig not cleared selecting either yes or no when we run the application
private void comboBox1_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
if (comboBox1.SelectedItem.Equals("yes"))
{
textBox32.Text = "cleared";
}
else { textBox32.Text = "not cleared"; }
}

Text of Text Box Based on ComboBox Item in WPF

6 solutions

Solution 3

Solution 4

Solution 5

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Solution 2

Solution 1

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