将Combobox项插入数据库列

Question

Is it possible to insert values from combobox to specific column in database?

For example if i have combobox with items: item1 , item2 , item3 and I want to bind them to some column : column1 , what I want to manage is this: if item1 is selected, when I click on button , I want to insert value of that item in the column1 , otherwise if selected item is item2 then I want value of item2 to be inserted in column1 , etc...

Now I know that the question is not really well written, but I just want to know if this is possible to do.

I've been Googling for this type of problem but I couldn't find the solution. I know how to make column records to be inserted into combobox items list but don't know the way to do the opposite.

Also would like to say that I have this problem in my WPF/WCF/MVVM application, so I would like to know if this is possible (and how) to solve it that way.

Answer 1

ofc you can. On the button click event you can just get the selected value of the combobox and save it.

var selectedItem = ComboBoxName.SelectedItem;

But if you have binded the combobox with objects then you can cast it.

var selectedItem = ComboBoxName.SelectedItem as (objecttypehere)

Update I missed that you used MVVM. Then in the view you can use bind the combobox with selected item.

<ComboBox ItemsSource="{Binding Items}" SelectedItem="{Binding TheSelectedItem}">
     //Itemtemplates.       
</ComboBox>

In the viewModel just acces the property you binded with the selecteditem in my test case "TheSelectedItem" property.

Save it!

Answer 2

This solution is based on MVVM pattern . Bind the Selected item of combo box control to some property in View model. So your view should look like

    <ComboBox ItemsSource="{Binding SomeItems,UpdateSourceTrigger=PropertyChanged,NotifyOnSourceUpdated=True}" SelectedValue="{Binding SelectedItemBinding,UpdateSourceTrigger=PropertyChanged,NotifyOnSourceUpdated=True}" />

    <Button Command={Binding ButtonClickCommand} ..../>

so once the Button is clicked you will get the RelayCommand handle in viewmodel and you can have a logic there to Get the selected item and use the value to insert into the column. Your view model should look like ,

    public class ViewModel : //implement notify property changed and ICommand
    {
        public RelayCommand ButtonClickCommand
        {
             get new RelayCommand(EventHandlerToBeCalled);
        }


        public string SelectedItemBinding
        {
             get;
             set
             {
                  //notify property changed.
             }
        }

        //method called when button is clicked.
        private void EventHandlerToBeCalled()
        {
              //here set the SelectedItemBinding to a column.
        }
    }

Answer 3

1. in combobox you can store values with prefix (col1_12, col2_24 etc)
2. on button click you should parse value: separate it on prefix and original value

3. so you can write value to needed column:

   switch (prefix) { case "col1" : table.column1 = value; break; case "col2" : table.column2 = value; break; // etc }