Windows Dev Center

ApplicationDataContainerSettings.HasKey | hasKey method

Determines whether there is an application setting with the specified key.

Syntax


public:
bool HasKey(
  String^ key
)

Parameters

key

Type: String [JavaScript] | Platform::String [C++]

The key.

Return value

Type: Boolean [JavaScript] | Platform::Boolean [C++]

True if the key is found; otherwise false.

Examples

Call the ApplicationDataContainer.CreateContainer | createContainer method to create a settings container. This example creates a settings container named exampleContainer and adds a setting named exampleSetting. The Always | always value from the ApplicationDataCreateDisposition enumeration indicates that the container should be created if it does not already exist.

Use the ApplicationDataContainer.Values | values property to access the exampleSetting setting in the exampleContainer container.

Call the ApplicationDataContainer.DeleteContainer | deleteContainer method to delete the exampleContainer settings container when you have finished with it.


ApplicationDataContainer^ localSettings = ApplicationData::Current->LocalSettings;

// Create a setting in a container

ApplicationDataContainer^ container = 
   localSettings->CreateContainer("exampleContainer", ApplicationDataCreateDisposition::Always);

if (localSettings->Containers->HasKey("exampleContainer"))
{
   auto values = localSettings->Containers->Lookup("exampleContainer")->Values;
   values->Insert("exampleSetting", "Hello Windows");
}

// Read data from a setting in a container

bool hasContainer = localSettings->Containers->HasKey("exampleContainer");
bool hasSetting = false;

if (hasContainer)
{
   auto values = localSettings->Containers->Lookup("exampleContainer")->Values;
   hasSetting = values->HasKey("exampleSetting");
}

// Delete a container

localSettings->DeleteContainer("exampleContainer");

Requirements (Windows 10 device family)

Device family

Universal

API contract

Windows.Foundation.UniversalApiContract, introduced version 1.0

Namespace

Windows.Storage
Windows::Storage [C++]

Metadata

Windows.Foundation.UniversalApiContract.winmd

Requirements (Windows 8.x and Windows Phone 8.x)

Minimum supported client

Windows 8

Minimum supported server

Windows Server 2012

Minimum supported phone

Windows Phone 8.1 [Windows Phone Silverlight 8.1 and Windows Runtime apps]

Namespace

Windows.Storage
Windows::Storage [C++]

Metadata

Windows.winmd

See also

Tasks
Quickstart: Local application data (JavaScript)
Quickstart: Local application data (C#/VB/C++)
Quickstart: Roaming application data (JavaScript)
Quickstart: Roaming application data (C#/VB/C++)
Concepts
Application data overview
Reference
ApplicationDataContainerSettings

 

 

Show:
© 2015 Microsoft