CODEWITHSUNDEEP
c#wpfcombobox
User720153
User720153

Reputation: 139

Runtime error using WPF ComboBox

What I wanted to do is make a particular string in a combobox the selectedindex. The contents of the combobox are filenames of files ina directory. This is an editable combobox. So I did

private void InitComboBoxProfiles()
{
    string appDataPath1 = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
    string configPath1 = appDataPath1 + "/LWRF/ReaderProfiles";
    string[] files = Directory.GetFiles(configPath1);
    foreach( string fn in files)
    {
        ComboBoxProfiles.Items.Add(fn);

    }
    int index = -1;
    foreach (ComboBoxItem cmbItem in ComboBoxProfiles.Items) //exception thrown at this line
    {
        index++;
        if (cmbItem.Content.ToString() == "Default.xml")
        {
            ComboBoxProfiles.SelectedIndex = index;
            break;
        }
    }

}

Exception:

Unable to cast object of type System.String to System.Windows.Controls.ComboBoxItem

How do I achieve my goal? thanks, saroj

Upvotes: 0

Views: 208

Answers (2)

Clemens
Clemens

Reputation: 128060

As the ComboBox items are strings, you could simply set the SelectedItem property to the desired string:

ComboBoxProfiles.SelectedItem = "Default.xml";

Note that this will automatically set the SelectedIndex property to the proper value, as SelectedItem and SelectedIndex will always be kept in sync.

Upvotes: 1

Abdusalam Ben Haj
Abdusalam Ben Haj

Reputation: 5423

The ComboBox Items are of type string. Change your code to this :

foreach (string cmbItem in ComboBoxProfiles.Items) 
    {
        index++;
        if (cmbItem == "Default.xml")
        {
            ComboBoxProfiles.SelectedIndex = index;
            break;
        }
    }

and better than looping :

ComboBoxProfiles.SelectedIndex = ComboBoxProfiles.Items.IndexOf("Default.xml");

Upvotes: 0

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