uwp barcode scanner example

uwp barcode scanner example

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5 . . Experiment with changing the dates and times to see how setting the expiration time forces a reload of the cache . An absolute expiration time applied to the cached item tells ASP .NET to flush the item from the cache at a certain time . Now try using a different kind of expiration technique the sliding expiration . Using a sliding expiration tells ASP .NET to keep the data in the cache as long as it has been accessed within a certain period of time . Items that have not been accessed within that time frame are subject to expiration .

If you need to access different databases as part of the same transaction (including databases on separate servers), of if you need to include other data sources such as Microsoft Message Queuing (MSMQ) in your transaction, you must use a distributed transaction coordinator (DTC) mechanism such as Windows Component Services In this case, you just perform the usual data access actions, and configure your components to use the DTC Commonly, this is done through attributes added to the classes that perform the data access However, ADONET supports the concept of automatic or lightweight transactions through the TransactionScope class You can specify that a series of actions require transactional support, but ADONET will not generate an expensive distributed transaction until you actually open more than one connection within the transaction scope.

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. 1 . . To set a sliding expiration for the cached data, modify the Page_Load method in the CacheExpirations page . Getting a sliding expiration to work is simply a matter of changing the parameters of the Insert method . Make up a time span after which you want the cached items to expire . Pass DateTime.MaxValue as the absolute expiration date and the TimeSpan as the final parameter like so:

protected void Page_Load(object sender, EventArgs e) { QuotesCollection quotesCollection; DateTime dtCurrent = DateTime.Now; Trace.Warn("Page_Load", "Testing cache: " + dtCurrent.ToString()); quotesCollection = (QuotesCollection)Cache["QuotesCollection"]; if (quotesCollection == null) { quotesCollection = new QuotesCollection(); quotesCollection.Synthesize(); TimeSpan tsExpires = new TimeSpan(0, 0, 15); dtCurrent = DateTime.Now; Trace.Warn("Page_Load", "Caching at: " + dtCurrent.ToString()); Trace.Warn("Page_Load", "This entry will expire in: " + tsExpires.ToString()); Cache.Insert("QuotesCollection", quotesCollection, null, DateTime.MaxValue, tsExpires);

In this example, the data template wraps a concrete view type. This allows the view to define code-behind behavior. In this way, the data template mechanism can be used to externally provide the association between the view and the view model. Although the preceding example shows the template in the UserControl resources, it can also be placed in application s resources for reuse. You can find an example of using data templates to instantiate views and associate them with their view models in the MVVM QuickStart file QuestionnaireView.xaml.

This means that you can perform multiple transacted updates to different tables in the same database over a single connection As soon as you open a new connection, ADONET automatically creates a distributed transaction (using Windows Component Services), and enrolls the original connections and all new connections created within the transaction scope into that distributed transaction You then call methods on the transaction scope to either commit all updates, or to roll back (undo) all of them Therefore, once you create the transaction scope or explicitly create a transaction, you use the Data Access block methods in exactly the same way as you would outside of a transaction You do not need to pass the transaction scope to the methods as you would when using ADONET methods directly.

this.GridView1.DataSource = quotesCollection; this.DataBind();

2 . . Surf to the page . You should see the cache reloading if you haven t accessed the cached item within the designated time frame . Cache dependencies represent another way to manage cached items . Look at how they work next .

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