Adding items to combobox list using a dictionary

Question

I have a dictionary of values named "odDict".   When i use the following code it only adds the first value in the dictionary.  How can i get it to populate the list using all values in the dictionary?

foreach (KeyValuePair<string, string> kvp in odDict)
{
string key = kvp.Key;
string val = kvp.Value;
cmbOverlayDistrict.Items.Add(val);
}

Wolf · Answer

I attached a small sample add-in project that has a Combo dropdown on the ArcGIS Pro ribbon and two dropdowns on a Dockpane.  I am using a dictionary (keys and values) to 'feed' the dropdown content.

DockpaneWithComboDropdown.zip

attributeTable.PNG

Wolf · Answer

@mstranovsky Your code snippet is not applicable in an ArcGIS Pro Add-in. There are two patterns in ArcGIS Pro to deploy a ComboBox: 1) If you are using a Pro Combo box ribbon control you would load the 'Ribbon' Dropdown from a dictionary like this: internal class TestComboBox : ComboBox { private bool _isInitialized; ///

/// Combo Box constructor ///

public TestComboBox() { UpdateCombo(); } // create a dictionary with an entry for each US state, the value should be the capital city of that state private Dictionary _stateCapitals = new Dictionary { { "Alabama", "Montgomery" }, { "Alaska", "Juneau" }, { "Arizona", "Phoenix" }, { "Arkansas", "Little Rock" }, { "California", "Sacramento" }, { "Colorado", "Denver" }, { "Connecticut", "Hartford" }, { "Delaware", "Dover" }, { "Florida", "Tallahassee" }, { "Georgia", "Atlanta" } }; ///

/// Updates the combo box with all the capitals of the US states ///

private void UpdateCombo() { if (_isInitialized) SelectedItem = ItemCollection.FirstOrDefault(); if (!_isInitialized) { // Updates the combo box with all the capital names of the US states foreach (var capital in _stateCapitals.Values) { Add(new ComboBoxItem(capital)); } _isInitialized = true; } Enabled = true; SelectedItem = ItemCollection.FirstOrDefault(); } ///

/// The on comboBox selection change event. ///

/// The newly selected combo box item protected override void OnSelectionChange(ComboBoxItem item) { if (item == null) return; if (string.IsNullOrEmpty(item.Text)) return; } } 2. If you are using a combobox on a Dockpane, you should use the MVVM pattern to populate the combobox content. In this case, please model your code after @SumitMishra_016 's sample snippet.

SumitMishra_016 · Answer

I have put my sample code, it is working for me public ObservableCollection CaseNumbers { get; set; } = new(); // Temporary list to avoid multiple UI updates List caseNumbersList = new(); while (await reader.ReadAsync()) { string caseNo = reader.GetString(0); caseNumbersList.Add(caseNo); } // Update UI on the main thread System.Windows.Application.Current.Dispatcher.Invoke(() => { CaseNumbers.Clear(); foreach (var caseNo in caseNumbersList) { CaseNumbers.Add(caseNo); } // Select the latest case number CaseNumberComboBox.SelectedItem = CaseNumbers.FirstOrDefault(); });