Develop Reference

WPF Set a TextBox property in code-behind

Hi I want to set the Text property of a Textbox by code behind. At the moment I do using XAML:
<TextBox x:Name="txtFilter" Text="{Binding FiltroFunzioni, Mode=OneWayToSource}" Grid.Row="0" />
As test I did this:
Binding b = new Binding();
b.Mode = BindingMode.OneWayToSource;
b.Path = new PropertyPath("Text"); //??
b.Source = PageViewModel.FiltroFunzioni;
BindingOperations.SetBinding(txtFilter, TextBlock.TextProperty, b);
The variable "FiltroFunzioni" is a string defined as property:
private string _filtroFunzioni = "";
public string FiltroFunzioni
{
get { return _filtroFunzioni; }
set
{
_filtroFunzioni = value;
RaisePropertyChanged("FiltroFunzioni");
_functionsView.Refresh();
}
}
Basically I dunno what kind of value should I set as PropertyPath. Any ideas?

You don't need the PropertyPath here. If you just remove it, your binding should work.
That being said, you should bind in XAML wherever possible.
If your issue is that changes to FiltroFunzioni don't update your textbox, that's because your binding is specifically declared as OneWayToSource: that means that changing the UI changes the source, but changing the source doesn't change the UI. If that isn't what you want, set the Mode to something else, like "TwoWay" - then changes to the source change the UI, AND changes to the UI change the source.
EDIT:
If you really want to bind from your ViewModel instead of just using XAML, TwoWay binding requires utilizing the Path for some reason, when binding through C#. Either of the following solutions work:
b.Source = FiltroFunzioni;
b.Path = new PropertyPath(".");
b.Source = this;
b.Path = new PropertyPath("FiltroFunzioni");
Note that with TwoWay binding you have to either initialize your FiltroFunzioni by setting the TextBox.Text property in your XAML, or setting FiltroFunzioni after the binding was initialized. Otherwise, WPF will immediately override it from the (by default empty) Text in your TextBox.

How to set the value of ControlTemplate in UWP

I working on Xamarin project and made custom renderer for my custom control in UWP project. I found how to set the ControlTemplate by using xml code.
XML Way:
var tb = new TextBox(); // or what I do in Xamarin var tb = Control;
var ct = (Controls.ControlTemplate)XamlReader.Load(#"
<ControlTemplate TargetType=""TextBox"" xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation' xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'>
<Grid>
....
</Grid>
</ControlTemplate>");
tb.Template = ct;
But how I can do the same in code?
var tb = new TextBox(); // or what I do in Xamarin var tb = Control;
var ct = new ControlTemplate();
ct.TargetType = typeof(TextBox);
var grid = new Grid();
ct.VisualTree = grid // This is how it was done in wpf but there is no such option in UWP
tb.Template = ct;

It's not supported in UWP, and I previously found no way to directly set it. As per the MS docs.
ControlTemplate: this is used as the value of the Control.Template
property, which defines the visuals of a control by applying the
template. You almost always define a ControlTemplate as a XAML
resource, using an implicit key TargetType that is the same as a Style
that sets Control.Template with a Setter. You rarely if ever assign a
value for Control.Template directly on a control instance.
Besides possibly delving into reflection, or using the XAMLReader as per your first example, I have never found another way to do it, like you do in WPF.

Button content not updating using Frameworkelementfactory

I have been trying to create a ContentTemplate using the lovely Frameworkelementfactory.
The code works except I can't set the content of the Button. I have tried many things but I always end up with a Button with Content= Button.
Here is the code which generates the contenttemplate. For your further info, I am using this in a Tabcontrol Header Itemtemplate...
Cheers.
ControlTemplate ct = new ControlTemplate(typeof(TabItem));
FrameworkElementFactory spouter = new FrameworkElementFactory(typeof (DockPanel));
FrameworkElementFactory text = new FrameworkElementFactory(typeof(TextBlock));
text.SetValue(TextBlock.TextProperty, Name);
spouter.AppendChild(text);
FrameworkElementFactory mButtonPrev = new FrameworkElementFactory(typeof(Button));
mButtonPrev.SetValue(System.Windows.Controls.Button.ContentProperty, "x");
mButtonPrev.AddHandler(System.Windows.Controls.Button.ClickEvent, new RoutedEventHandler(CloseTab));
spouter.AppendChild(mButtonPrev);
ct.VisualTree = spouter;
return ct;

ControlTemplate ct = new ControlTemplate(typeof(TabItem));
Shouldn't you be creating a DataTemplate here instead?
(Everything else looks fine to me, also FEF is deprecated, read the docs)

For those of use still using FEF, I was able to set the content of my button with the actual string. I see Name as where "button" is coming from in your example. In my example, Name pulls up the class name that I'm binding to my datagrid.
var buttonTemplate = new FrameworkElementFactory(typeof(Button));
var text = new FrameworkElementFactory(typeof(TextBlock));
text.SetValue(TextBlock.TextProperty, "Save");
buttonTemplate.AppendChild(text);
buttonTemplate.AddHandler(
System.Windows.Controls.Primitives.ButtonBase.ClickEvent,
new RoutedEventHandler((o, e) => MessageBox.Show("hi"))
);
AccountDatagrid.Columns.Add(new DataGridTemplateColumn()
{
Header = "Save",
CellTemplate = new DataTemplate() { VisualTree = buttonTemplate }
});
AccountDatagrid.ItemsSource = AccoutDescCodeTime.GetBaseAccounts();

How can I create a hyperlink in C# code instead of XAML

How can I create a hyper link in C# code that looks like the following in XAML?:
<TextBlock>
<Hyperlink Click="HyperLinkClick">New Hyperlink</Hyperlink>
</TextBlock>

MSDN usually has very good examples. Combining the examples for TextBlock and Hyperlink:
TextBlock textBlock1 = new TextBlock();
Run run3 = new Run("Link Text.");
Hyperlink hyperl = new Hyperlink(run3);
hyperl.NavigateUri = new Uri("http://search.msn.com");
textBlock1.Inlines.Add(hyperl);

How to assign a dynamic resource style in code?

I want to produce in code the equivalent of this in XAML:
<TextBlock
Text="Title:"
Width="{Binding FormLabelColumnWidth}"
Style="{DynamicResource FormLabelStyle}"/>
I can do the text and the width, but how do I assign the dynamic resource to the style:
TextBlock tb = new TextBlock();
tb.Text = "Title:";
tb.Width = FormLabelColumnWidth;
tb.Style = ???

You should use FrameworkElement.SetResourceReference if you want true DynamicResource behaviour - ie updating of the target element when the resource changes.
tb.SetResourceReference(Control.StyleProperty, "FormLabelStyle")

You can try:
tb.Style = (Style)FindResource("FormLabelStyle");
Enjoy!

The original question was how to make it Dynamic, which means if the resource changes the control will update. The best answer above used SetResourceReference. For the Xamarin framework this is not available but SetDynamicResource is and it does exactly what the original poster was asking. Simple example
Label title = new Label();
title.Text = "Title";
title.SetDynamicResource(Label.TextColorProperty, "textColor");
title.SetDynamicResource(Label.BackgroundColorProperty, "backgroundColor");
Now calling:
App.Current.Resources["textColor"] = Color.AliceBlue;
App.Current.Resources["backgroundColor"] = Color.BlueViolet;
Causes the properties to change for all controls using the resource this way. This should work for any property.

This should work:
tb.SetValue(Control.StyleProperty, "FormLabelStyle");

Application.Current.Resources.TryGetValue("ResourceKey", out var value)