Clash Royale CLAN TAG

Textbox not updating when static object method to update property is called

First, let me state I am new to C# altogether. At the moment I am working on a program, and have been trying to get something that I thought would be rather simple to do. This is apparently not the case. I'll show here a very small example of what I have been trying to do. This is functionally identical, but without all the extra things that I have in the real project. We have 3 files here.

MainWindow.xaml

<Window.Resources>
<CollectionViewSource x:Key="data1ViewSource" d:DesignSource="{d:DesignInstance {x:Type local:Data1}, CreateList=True}"/>
</Window.Resources>
<Grid>
<Button x:Name="TestButton" Content="Button" HorizontalAlignment="Left" Margin="78,25,0,0" VerticalAlignment="Top" Width="75" Click="TestButton_Click"/>
<TextBox x:Name="testStringTextBox" HorizontalAlignment="Left" Height="24" Margin="78,86,0,309" Grid.Row="0" Text="{Binding TestString}" VerticalAlignment="Center" Width="120"/>
<TextBlock x:Name="testStringTextBlock" HorizontalAlignment="Left" Margin="78,143,0,0" TextWrapping="Wrap" Text="{Binding TestString}" VerticalAlignment="Top" Height="181" Width="245"/>
</Grid>


MainWindow.xaml.cs

public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}

private void TestButton_Click(object sender, RoutedEventArgs e)
{
Class1.TheButton();
}

private void Window_Loaded(object sender, RoutedEventArgs e)
{
System.Windows.Data.CollectionViewSource data1ViewSource = ((System.Windows.Data.CollectionViewSource)(this.FindResource("data1ViewSource")));
// Load data by setting the CollectionViewSource.Source property:
// data1ViewSource.Source = [generic data source]
}
}


Class1.cs

public static class Class1
{
private static int Inc = 1;
public static Data1 testData = new Data1("Starting testn");

public static void TheButton()
{
testData.TestString += "Test number " + Inc.ToString() + ".n";
Inc++;
}
}

public class Data1 : INotifyPropertyChanged
{
public Data1(string input)
{
TestString = input;
}

private string _testString;
public event PropertyChangedEventHandler PropertyChanged;
public string TestString
{
get { return _testString; }
set { _testString = value; OnPropertyChanged("TestString"); }
}

protected void OnPropertyChanged(string name)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null)
{
handler(this, new PropertyChangedEventArgs(name));
}
}
}


The program compiles as is, without error, and when I set a breakpoint, I can view the object Class1.testData, and I can see the proper value in Class1.testData.TestString and _testString.

I have spent several days searching for some sort of simple example of what I'm trying to do here, and I have yet been able to find any solution to get it actually working. I've come to the conclusion that I must be doing something wrong or just plain missing something, but I also cannot find anything to give me insight on what that is.

1 Answer
1

Try setting your binding mode to OneWay.

<Window.Resources>
<CollectionViewSource x:Key="data1ViewSource" d:DesignSource="{d:DesignInstance {x:Type local:Data1}, CreateList=True}"/>
</Window.Resources>
<Grid>
<Button x:Name="TestButton" Content="Button" HorizontalAlignment="Left" Margin="78,25,0,0" VerticalAlignment="Top" Width="75" Click="TestButton_Click"/>
<TextBox x:Name="testStringTextBox" HorizontalAlignment="Left" Height="24" Margin="78,86,0,309" Grid.Row="0" Text="{Binding TestString, Mode="OneWay"}" VerticalAlignment="Center" Width="120"/>
<TextBlock x:Name="testStringTextBlock" HorizontalAlignment="Left" Margin="78,143,0,0" TextWrapping="Wrap" Text="{Binding TestString, Mode="OneWay"}" VerticalAlignment="Top" Height="181" Width="245"/>
</Grid>


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