Set the valuer of selected combobox item in c# windows universal

Question

This is my combo box

<ComboBox
 Name="truck_trypes_combo"
 DisplayMemberPath="description"
 SelectedValuePath="id"
 Header="Truck category"
>

Am setting its itemsource via

  TruckTypesSqlite truckypessqlite = new TruckTypesSqlite();
  truck_trypes_combo.ItemsSource = truckypessqlite.GetAllTruckTypes();

In my TruckTypesqlite

class TruckTypesSqlite {

      public List<TruckTypesModel> GetAllTruckTypes()

      {
          //fetch data from sqlite and return a list of type TruckTypesModel
      }

  }

The TruckTypesModel class consists of an id and description properties.

The above works but am now how do i set the selected item of the combobox suppose that i have an id of 25

After a few research i found out that i need to set the SelectedIndex being new to c# how do i get the index of a value like 25 in the list returned by GetAllTruckTypes() so that i can simply do

public void setSeletedValue(){
   //set the index of id value 25
    truck_trypes_combo.SelectedIndex = ;//index of id value 25

   }

Answer 1

Try this:

public void setSeletedValue(int id)
{
    var allTruckTypes = truckypessqlite.GetAllTruckTypes();
    int index = allTruckTypes.FindIndex(t => t.id == id);
    if (index != -1)
    {
        truck_trypes_combo.SelectedIndex = index;
    }
}

You may also need to improve the code by making allTruckTypes a public property so it can be reused in multiple methods, also use data binding for the SelectedItem of the combo box instead of setting its SelectedIndex explicitly.

But since you have just started to use C#, I am just showing you how to find the item (and its index) from the list.