CODEWITHSUNDEEP
c#wpf
luke_t
luke_t

Reputation: 2975

ComboBox2 items populate when ComboBox1 has value

I am using WPF. I have a LINQ query which populates ComboBox1. The value selected from ComboBox1 should then be used in the where clause of a LINQ query which I want to populate ComboBox2.

Is there an event trigger so that when a value has been selected in ComboBox1, ComboBox2 will populate with LINQ query results? I've written the LINQ query, but not too sure how to make it run on the event.

This is what I want to run after ComboBox1 value has been selected

private void ComboBox2_Loaded(object sender, RoutedEventArgs e)
{
    string comboName = ComboBox1.Text;
    int recipId = RecipID(comboName);
    ComboBox2.ItemsSource = MainWindow.qryGiftList(recipId);
    ComboBox2.DisplayMemberPath = "cGift";
}

EDIT:

private void ComboBox1_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    if (_comboSelection.cItem == "Gift")
    {
        string comboName = ComboBox1.Text;
        int recipId = RecipID(comboName);
        ComboBox2.ItemsSource = MainWindow.qryGiftList(recipId);
        ComboBox2.DisplayMemberPath = "cGift";
    }
}

I also tried instead of using string ComboName = ComboBox1.Text; to use string ComboName = (string)ComboBox1.SelectedItem but this results in a debug of:

An unhandled exception of type 'System.InvalidCastException' occurred in myMemory.exe Additional Information: Unable to cast object of type 'myMemory.Name' to type 'System.string'.

Upvotes: 0

Views: 101

Answers (1)

Nejdi Kroi
Nejdi Kroi

Reputation: 612

The right event is SelectionChanged. <ComboBox x:Name="combobox1" SelectionChanged="comobox1_SelectionChanged"/>

You can get the selected value in the event like this string value = (string)combobox1.SelectedItem;

Upvotes: 1

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