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A sponsor object can run on the server machine or the client machine. The following sponsor class exposes a method named SetState, which lets clients affect the value of a private Active field. If this field is True, the sponsor renews the lease of the associated remote object; otherwise, the sponsor refuses to extend the object s lifetime:

The .NET Framework provides no method on the Cache class to programmatically clear all the content. The following code snippet shows how to build one:

Public Class CalculatorSponsor Inherits MarshalByRefObject Implements ISponsor This is an MBR object.

public void Clear() { foreach(DictionaryEntry elem in Cache) { string s = elem.Key.ToString(); Cache.Remove(s); } }

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Nov 24, 2015 · NET, Platform: ASP.NET Web Forms, Product: ASPxDataEditors, Type: Question, Subject: ASPxTextBox - Scanning barcodedata using serial ...

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If True the sponsor renews the object s lease. Private Active As Boolean = True Let remote clients set the sponsor s active state. Public Sub SetState(ByVal active As Boolean) Me.Active = active End Sub Public Function Renewal(ByVal lease As ILease) As TimeSpan _ Implements ISponsor.Renewal If Active Then Return New TimeSpan(0, 1, 0) One minute Else Return TimeSpan.Zero End If End Function End Class

Even though the ASP.NET cache is implemented to maintain a neat separation between the application s items and the system s items, it is preferable that you delete items in the cache individually. If you have several items to maintain, you might want to build your own wrapper class and expose one single method to clear all the cached data.

Implementing the ISponsor interface is what makes the CalculatorSponsor class work as a sponsor. In addition, sponsor classes usually derive from MarshalByRefObject to make them accessible to clients via remoting.

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Whenever you read or write an individual cache item, from a threading perspective you re absolutely safe. The ASP.NET Cache object guarantees that no other concurrently running threads can ever interfere with what you re doing. If you need to ensure that multiple operations on the Cache object occur atomically, that s a different story. Consider the following code snippet:

This version of the report is rendered using the Render() method of the Web service. The difference between the two methods used to render the report is transparent to the user. Although using the URL method generally performs better than using the Web service, in this application the difference is negligible because a Reporting Service object has to be instantiated to retrieve the parameter values for display in the ListBox controls. As you learned earlier in this chapter, you can pass the URL to an HttpWebResponse object without instantiating a Reporting Service object when you don t need to access information about the report before displaying it.

var counter = -1; object o = Cache["Counter"]; if (o == null) { // Retrieve the last good known value from a database // or return a default value counter = RetrieveLastKnownValue(); } else { counter = (Int32) Cache["Counter"]; counter ++; Cache["Counter"] = counter; }

The Calculator class registers its sponsor in its InitializeLifetimeService procedure by invoking the lease s Register method and makes the sponsor available to clients through its Sponsor read-only property:

The Cache object is accessed repeatedly in the context of an atomic operation incrementing a counter. Although individual accesses to Cache are thread-safe, there s no guarantee that other threads won t kick in between the various calls. If there s potential contention on the cached value, you should consider using additional locking constructs, such as the C# lock statement (SyncLock in Microsoft Visual Basic .NET). Important Where should you put the lock If you directly lock the Cache object, you might run

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