Update data binding by Enter Key in code behind WPF

Question

I have a FrameworkElementFactory works like a textbox created in the code, so there is no xaml code, and also I set this textbox with data binding in code. Now I want to update this textbox databinding by Enter key pressed. I have read one way for attached behavior in this Link, but it seems working with xaml code. Is there any way to set attached behavior in code behind?

ListBox DDF_List = new ListBox();

FrameworkElementFactory Editable_TextBox = new FrameworkElementFactory(typeof(TextBox));
Binding text_binding = new Binding("Value");
Editable_TextBox.SetBinding(TextBox.TextProperty, text_binding);

DataTemplate Text_Layout = new DataTemplate();
Text_Layout.VisualTree = Editable_TextBox;
DDF_List.ItemTemplate = Text_Layout;

15ee8f99-57ff-4f92-890c-b56153 · Accepted Answer · 2017-06-01T17:49:59.073

0

You should almost certainly be doing this with a DataTemplate in XAML. What you've got is a prefect case for doing everything in XAML. But if you're committed to doing it the hard way, here's how.

With your FrameworkElementFactory, you can set it like any other dependency property on a FrameworkElementFactory:

Editable_TextBox.SetValue(
    InputBindingsManager.UpdatePropertySourceWhenEnterPressedProperty, 
    TextBox.TextProperty);

More generally, here's now to apply that attached property to a TextBox in C#, where itemNameTextBox is the TextBox:

InputBindingsManager.SetUpdatePropertySourceWhenEnterPressed(itemNameTextBox, 
    TextBox.TextProperty);

With attached properties, this C#:

var itemNameTextBox = new TextBox { Name = "itemNameTextBox" };

var binding = new Binding("ItemName")
{
    UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged
};

itemNameTextBox.SetBinding(TextBox.TextProperty, binding);

//  This is the line you're asking for:
InputBindingsManager.SetUpdatePropertySourceWhenEnterPressed(itemNameTextBox, 
    TextBox.TextProperty);

Is an exact equivalent of this XAML:

<TextBox 
    Name="itemNameTextBox"
    Text="{Binding Path=ItemName, UpdateSourceTrigger=PropertyChanged}"
    b:InputBindingsManager.UpdatePropertySourceWhenEnterPressed="TextBox.Text"
    />

edited Jun 01 '17 at 17:49

answered Jun 01 '17 at 15:26

15ee8f99-57ff-4f92-890c-b56153

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Thanks, it works great. But can I use Frameworkelementfactory to replace the "itemNameTextBox" in this context – Sam Xia Jun 01 '17 at 15:50
@SamXia Absolutely. The call to `InputBindingsManager.SetUpdatePropertySourceWhenEnterPressed()` is the only part of my code you need -- just pass that your textbox, however you created it. I just did all that stuff to justify my claim that it was "an exact equivalent to the XAML". I'll update to clarify the point. – 15ee8f99-57ff-4f92-890c-b56153 Jun 01 '17 at 15:55
No, I mean I use FrameworkElementFactory type to replace TextBox type in input, but it tells me the FrameworkElementFactory is not DependencyObject – Sam Xia Jun 01 '17 at 15:59
`FrameworkElementFactory` isn't a `TextBox`. I don't understand what you are doing at all. Please add enough code to your question for me to understand what you are doing. – 15ee8f99-57ff-4f92-890c-b56153 Jun 01 '17 at 16:02
What is InputBindingsManager? is it a part of Telerik WPF? – Sorush Sep 03 '19 at 09:27
@Sorush Google says Telerik. – 15ee8f99-57ff-4f92-890c-b56153 Sep 03 '19 at 11:05

Update data binding by Enter Key in code behind WPF

1 Answers1