UWP-将向量绑定到C ++中的ComboBox

Question

I've got a combobox im my UI. In my network class I've got a method which recieves udp-packets and takes the IPaddresses from them. Which datatype do I take for saving the addresses as strings (Vector, IVector ?). And how do I connect this object ,which has the addresses, to my combobox in the UI - so each address is shown dynamically in the combobox . I am using c++ for the network class and xaml + c++ for the UI. To avoid confusion, I am using the UWP-XAML-C++ template from Visual Studio 2017.

Answer 1

Which datatype do I take for saving the addresses as strings (Vector, IVector ?)

Yes, Vector can be used as the collection binding to the ComboBox . More details about C++/CX collection please reference this document .

And how do I connect this object ,which has the addresses

For this we need to use data binding .

For example, suppose there is a network class contains IpAddress property as follows:

Code in MainPage.xaml.h

public ref class MainPage sealed
{
public:
    MainPage();
private:
    void btnbinding_Click(Platform::Object^ sender, Windows::UI::Xaml::RoutedEventArgs^ e);
};

public ref class network sealed
{
public:
    property Platform::String^ IpAddress;
};

Then we can bind the network collection(vector) to the ComboBox as follows:

XAML Code

<ComboBox x:Name="combo" >
    <DataTemplate>
        <TextBlock Text="{Binding IpAddress}"></TextBlock>
    </DataTemplate>
</ComboBox>

Code behind

void CombboxC::MainPage::btnbinding_Click(Platform::Object^ sender, Windows::UI::Xaml::RoutedEventArgs^ e)
{
    Platform::Collections::Vector<network^>^ items = ref new Platform::Collections::Vector<network^>();  
    network^ onenet = ref new network();
    onenet->IpAddress = "Test";
    items->Append(onenet);
    combo->ItemsSource = items; 
}