C# appending data in textbox

Question

I am trying to append data into textbox using MVVM. My problem is my data is not appending. Here is my code:

Model:

//This is where the Outgoing Ports are Tapped and the data is displayed to the serial Monitor.
var rawPacket = e.Value as RawPacket;                                                     // Data recived from the port after tapped 
StringBuilder sb = new StringBuilder();
for (int i = 0; i < rawPacket.RawData.Length; i++) {
    sb.Append(rawPacket.RawData[i].ToString("X2"));
}
this.serialData.LuminRecevied = sb.ToString() + Environment.NewLine;

View model:

public string LuminRecevied {
    get { return luminRecevied; }
    set {
        if (this.luminRecevied == value) {
            return;
        }
        this.luminRecevied = value ;
        this.InvokePropertyChanged("LuminRecevied");
    }
}

Binding xaml:

<TabItem Header="Luminaire" Name="tabItem3" HorizontalAlignment="Center">
            <TextBox TextWrapping="Wrap"  FontFamily="Verdana" FontSize="13" Text="{Binding LuminRecevied,StringFormat=RX: {0}}" AcceptsReturn="True" TextChanged="TextBox_TextChanged_1" AcceptsTab="True" />
        </TabItem>

I can see only LuminRecevied where is your EnergyRecevied Property — Dinesh balan
– Dinesh balan, Commented Jul 2, 2015 at 9:22
Sorry! i posted the wrong part of the code. i edited it. its proper now. — Anil Gadiyar
– Anil Gadiyar, Commented Jul 2, 2015 at 9:41

Leigh Shepperson · Accepted Answer · 2015-07-02 09:54:08Z

2

Also, if you want it to append, then

this.serialData.LuminRecevied = sb.ToString() + Environment.NewLine;

sets LuminRecevied equal to

sb.ToString() + Environment.NewLine;

You want to do this instead

this.serialData.LuminRecevied += sb.ToString() + Environment.NewLine;

Note the (+=)

answered Jul 2, 2015 at 9:54

Leigh Shepperson

1,0535 silver badges13 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Anil Gadiyar Over a year ago

Hi, still not able to append data.

Leigh Shepperson Over a year ago

Hi, when you say appending data, I'm just wondering if are you able to get anything to show up at all? I.e. when you call sb.ToString(), does the text box get populated by its value?

BSG · Accepted Answer · 2015-07-02 09:38:30Z

1

Change your code like this and try

<TabItem Header="Energy-Meter" Name="tabItem4">
    <TextBox TextWrapping="Wrap" FontFamily="Verdana" FontSize="13"
     Text="{Binding LuminRecevied ,StringFormat=RX: {0}}" AcceptsReturn="True"
     TextChanged="TextBox_TextChanged_1" AcceptsTab="True" />
</TabItem>

answered Jul 2, 2015 at 9:38

BSG

1,96815 silver badges21 bronze badges

1 Comment

Anil Gadiyar Over a year ago

Hi, i want my data to append in the textbox. but it simply overwrites

Leigh Shepperson · Accepted Answer · 2015-07-02 09:49:59Z

Changing the property to LuminRecevied in the binding for the Text element should be enough. A simple mock up is enough to prove this:

public class ViewModel : INotifyPropertyChanged {
private string luminRecevied;

public string LuminRecevied
{
    get { return luminRecevied; }
    set
    {
        if (this.luminRecevied == value)
        {
            return;
        }
        this.luminRecevied = value;
        this.InvokePropertyChanged("LuminRecevied");
    }
}

private void InvokePropertyChanged(string propName)
{
    var propertyChanged = PropertyChanged;

    if (propertyChanged != null)
        this.PropertyChanged.Invoke(this, new PropertyChangedEventArgs(propName));
}


public event PropertyChangedEventHandler PropertyChanged;
}

XAML:

<Window x:Class="WpfApplication1.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" Height="350" Width="525">
<Grid>
    <TabControl Height="311" HorizontalAlignment="Left" Name="tabControl1" VerticalAlignment="Top" Width="503">
        <TabItem Header="Energy-Meter" Name="tabItem4">
            <TextBox TextWrapping="Wrap" FontFamily="Verdana" FontSize="13" Text="{Binding LuminRecevied,StringFormat=RX: {0}}" AcceptsReturn="True" AcceptsTab="True" />
        </TabItem>
    </TabControl>
    <Button Content="Button" Height="23" HorizontalAlignment="Left" Margin="93,0,0,0" Name="button1" VerticalAlignment="Top" Width="75" Click="button1_Click" />
</Grid>
</Window>

Code behind hookup:

 public partial class MainWindow : Window {
    private ViewModel viewModel = new ViewModel();

    public MainWindow()
    {
        InitializeComponent();

        this.DataContext = viewModel;
    }

    private void button1_Click(object sender, RoutedEventArgs e)
    {
        this.viewModel.LuminRecevied += "h";
    }
}

Liero · Accepted Answer · 2015-07-02 09:51:16Z

1

this.serialData.LuminRecevied += String.Concat(
   rawPacket.RawData.Select(i => i.ToString("X2")) + Environment.NewLine;

answered Jul 2, 2015 at 9:51

Liero

27.8k41 gold badges184 silver badges350 bronze badges

Collectives™ on Stack Overflow

C# appending data in textbox

4 Answers 4

2 Comments

1 Comment

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

4 Answers 4

2 Comments

1 Comment

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related