Windows 10: Getting Started with Roaming App Data

Brink · May 2, 2016

Users today are mobile, transitioning from one device to the next throughout the day. Increasingly, these same users expect (or even demand) to take their data with them. Fortunately for us, roaming app data makes this a reality.
Today, we kick off a two-post series that explores how to use roaming app data to give your users a truly mobile experience. In today’s blog post, we’ll explain what roaming data is, how it works, and some ways you can use it in your own app. Finally, we’ll also cover versioning and conflict resolution.

Roaming app data

Roaming app data is the way in which all Universal Windows Platform (UWP) apps keep data in sync across multiple devices. It allows you, the developer, to create apps that help users carry data such as user profiles or documents from one device to the next. Generally speaking, roaming app data breaks down into three main categories:

App data is the data your application requires to function. This data needs to be in sync across all devices.

User data is any data that the user initiates via the application that will synchronize across all devices. For example, if you use your Microsoft account to store Microsoft Office files in the cloud from your desktop and then open Microsoft Office on your laptop, you will be presented with a list of your recent files.

App settings are any configuration settings for an app that will stay in sync across all devices. Think of your profile settings in Visual Studio 2015.

Before we get started digging into the API, it’s important to understand that you have two main points of entry into your roaming app data:

RoamingSettings

RoamingFolder

RoamingSettings

The built-in ApplicationData.RoamingSettings property, which is of the type ApplicationDataContainer, stores its data as a dictionary key/value pair with a string for the key. The key of each setting can be up to 255 characters long and the value for each setting can be no more than 8K bytes in size. Bear in mind, however, that you can only store the following data types:

UInt8, Int16, UInt16, Int32, UInt32, Int64, UInt64, Single, Double

Boolean

Char16, String

DateTime,TimeSpan

GUID, Point, Size,Rect

ApplicationDataCompositeValue

Although you should choose the data type that works best for you and your specific app, ApplicationDataCompositeValue in the above list is the recommended choice. Unlike the other types, which have an 8k-byte limit, this type allows you to store up to 64K bytes. Critically, it also lets you store a subset of settings or categorize your settings...
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Read more: Getting Started with Roaming App Data | Building Apps for Windows

:)

scoll365 · May 2, 2016

N8 not able to use data when roaming

I have had a N8 for 4 months. Only app downloaded from OVI is Twitter. Everything works fine in home country both via WLAN and Service Provider data WAP. I have got an account that allows roaming and data roaming.

On roaming when I start Twitter the tiny window opens saying 'Connecting via [home SP] WAP. This clearly does not work and I get an error message. I am trying to get it to use the WAP of the roaming service provider to which I have access.

If I connect via WLAN it works.

How do I get it to use the roaming SP WAP?

Phone calls and SMS is fine.

thanks

Entegy · May 2, 2016

windows phone 8 data usage while roaming help

Well, by default, the phone doesn't use cellular data while roaming, so even with this weird leak, you wouldn't be hit by hit. Turn your syncing back on and instead go to Settings>cellular and either change the data connection to off or make sure Data
Roaming Options is set to Don't Roam.

No it's time to find out where this leak is coming from. Can you think of any app you added recently when this problem started? Try removing apps and see what happens, then adding them back in.

Windows 10: Getting Started with Roaming App Data

Getting Started with Roaming App Data

Getting Started with Roaming App Data

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