[UWP] [C ++]如何枚举存储在ApplicationDataComposite中的信息？ [英] [UWP][C++] How to enumerate info stored in ApplicationDataComposite ?

问题描述

我的UWP C ++应用程序使用ApplicationDataComposite存储客户名称列表，如下所示。

My UWP C++ app store the list of customer's name using ApplicationDataComposite as codes below.

在应用程序启动期间，应用程序需要枚举与客户信息（地址，电话等）相关联的客户名称列表。我怎么能这样做？是否有任何UWP C ++示例代码来完成这项任务？

During application startup, the app needs to enumerate the list of customer's name associated with customer information (address, phone, etc...). How could I do that ? are there any UWP C++ sample codes to achieve this task ?

谢谢

void MainPage :: OnSaveCustomerInfoBtn_Click（Platform :: Object ^ sender，Windows :: UI :: Xaml :: RoutedEventArgs ^ e）

{

    composite = safe_cast< ApplicationDataCompositeValue ^>（localSettings-> Values-> Lookup（customerName-> Text））;

     if composite == nullptr）{

        composite = ref new ApplicationDataCompositeValue（）;

        auto values = localSettings->值;

        values-> Insert（customerName-> Text，composite）;

    }

     composite-> Insert（" address"，dynamic_cast< PropertyValue ^>（PropertyValue :: CreateString（customerAddress-> Text）））;

     composite-> Insert（" phone"，dynamic_cast< PropertyValue ^>（PropertyValue :: CreateString（customerPhone-> Text）））;

}

void MainPage::OnSaveCustomerInfoBtn_Click(Platform::Object^ sender, Windows::UI::Xaml::RoutedEventArgs^ e)
{
    composite = safe_cast<ApplicationDataCompositeValue^>(localSettings->Values->Lookup(customerName->Text));
    if composite == nullptr) {
        composite = ref new ApplicationDataCompositeValue();
        auto values = localSettings->Values;
        values->Insert(customerName->Text, composite);
    }
    composite->Insert("address", dynamic_cast<PropertyValue^>(PropertyValue::CreateString(customerAddress->Text)));
    composite->Insert("phone", dynamic_cast<PropertyValue^>(PropertyValue::CreateString(customerPhone->Text)));
}

推荐答案

嗨dalee，



您可以参考以下内容代码段。此外，您可以通过创建ApplicationDataContainer来组织数据。有关详细信息，请参阅此处。

https://msdn.microsoft.com/en-us/library/windows/apps/windows.storage.applicationdatacontainer.aspx

auto values = localSettings->Values;
for (auto compositeCollection : values)
{
    auto name = compositeCollection->Key;
    auto composite = safe_cast<ApplicationDataCompositeValue^>(compositeCollection->Value);
    auto address = safe_cast<String^>(composite->Lookup("address"));
}

最好的问候，

David

Best Regards,
David

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