WPF C# - How Can I Dynamically Add ComboBoxItems?

Question

I am currently trying to dynamically add ComboBoxItems to a ComboBox that was also created dynamically. I get an error saying that the ComboBox name does not exist.

Anyone know how I would be able to get around this? Any help is appreciated.

YearGroupRegistersRightSide.Children.Add(new ComboBox { Name = "DynamicCombobox3", SelectedIndex = 0 });

DynamicCombobox3.Children.Add(new ComboBoxItem{Name="Item One", Content="<--- Select --->>"});

I would argue that in WPF you should do this via databinding (MVVM). The combobox should be instantiated using a template/itemtemplate/contentpresenter and the items should be assigned through a binding as well. If you add more info on what the dynamic combobox is based on one could give a more appropriate answer — Dennis Kuypers
– Dennis Kuypers, Commented Mar 25, 2018 at 16:16
Take a look at Data Templating Overview. If you're going to dynamically add items to a ComboBox, you should set or bind its ItemsSource property to a collection of item objects (e.g. strings) and use an appropriate DataTemplate (or set DisplayMemberPath) for display. — Clemens
– Clemens, Commented Mar 25, 2018 at 16:16

Eduard Malakhov · Accepted Answer · 2018-03-25 18:32:16Z

1

Combobox doesn't have a Children property. I suggest you new up your combo first then you can keep a reference to it easily. Like:

ComboBox DynamicCombobox3 = new ComboBox { Name = "DynamicCombobox3", SelectedIndex = 0 };
YearGroupRegistersRightSide.Children.Add(DynamicCombobox3);

DynamicCombobox3.Items.Add(new ComboBoxItem { Name = "Item One" });

edited Mar 25, 2018 at 18:32

Eduard Malakhov

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answered Mar 25, 2018 at 16:05

Andy

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Andy Over a year ago

Sure, he should learn mvvm. Maybe use templating to create the combo and probably bind the itemssource to a resource or collection. Or maybe he should be building XAML as xml instead and using xamlreader.parse. Impossible to tell from the code given.

David Walschots · Accepted Answer · 2018-03-25 16:27:22Z

0

I guess the ComboBox is not getting instantiated, try changing the 1st line to the following:

ComboBox DynamicCombobox3 = new ComboBox() { Name = "DynamicCombobox3", SelectedIndex = 0 };

Maybe you are missing the round brackets which call the constructor of ComboBox.

edited Mar 25, 2018 at 16:27

David Walschots

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answered Mar 25, 2018 at 16:09

The Technology is yours

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1 Comment

Clemens Over a year ago

It's of course instantiated, just not assigned to a variable named DynamicCombobox3.

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