barcode printing vb.net Part V in Visual C#.NET

Creation PDF417 in Visual C#.NET Part V

Part V
Drawing PDF-417 2d Barcode In Visual C#.NET
Using Barcode generation for VS .NET Control to generate, create PDF-417 2d barcode image in VS .NET applications.
www.OnBarcode.com
Read PDF-417 2d Barcode In Visual C#
Using Barcode decoder for .NET Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
Threading
Painting Barcode In Visual C#
Using Barcode encoder for .NET Control to generate, create barcode image in VS .NET applications.
www.OnBarcode.com
Bar Code Recognizer In Visual C#.NET
Using Barcode decoder for Visual Studio .NET Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
// Create a Task (it does not start running now) Task<Int32> t = new Task<Int32>(n => Sum((Int32)n), 1000000000); // You can start the task sometime later t.Start(); // Optionally, you can explicitly wait for the task to complete t.Wait(); // FYI: Overloads exist accepting timeout/CancellationToken // You can get the result (the Result property internally calls Wait) Console.WriteLine("The Sum is: " + t.Result); // An Int32 value
PDF 417 Generator In .NET
Using Barcode generator for ASP.NET Control to generate, create PDF417 image in ASP.NET applications.
www.OnBarcode.com
PDF 417 Drawer In VS .NET
Using Barcode generator for VS .NET Control to generate, create PDF 417 image in .NET framework applications.
www.OnBarcode.com
Important When a thread calls the Wait method, the system checks if the Task that the thread
Creating PDF417 In VB.NET
Using Barcode creation for VS .NET Control to generate, create PDF417 image in .NET framework applications.
www.OnBarcode.com
PDF417 Generator In Visual C#.NET
Using Barcode printer for .NET framework Control to generate, create PDF417 image in .NET applications.
www.OnBarcode.com
is waiting for has started executing . If it has, then the thread calling Wait will block until the Task has completed running . But if the Task has not started executing yet, then the system may (depending on the TaskScheduler) execute the Task using the thread that called Wait . If this happens, then the thread calling Wait does not block; it executes the Task and returns immediately . This is good in that no thread has blocked, thereby reducing resource usage (by not creating a thread to replace the blocked thread) while improving performance (no time is spent to create a thread and there is no context switching) . But it can also be bad if, for example, the thread has taken a thread synchronization lock before calling Wait and then the Task tries to take the same lock, resulting in a deadlocked thread!
Matrix 2D Barcode Creator In C#
Using Barcode drawer for .NET Control to generate, create Matrix Barcode image in VS .NET applications.
www.OnBarcode.com
Generating UPC-A Supplement 2 In C#.NET
Using Barcode creator for .NET framework Control to generate, create UPC-A Supplement 5 image in .NET applications.
www.OnBarcode.com
If the compute-bound task throws an unhandled exception, the exception will be swallowed, stored in a collection, and the thread pool thread is allowed to return to the thread pool . When the Wait method or the Result property is invoked, these members will throw a System.AggregateException object . The AggregateException type is used to encapsulate a collection of exception objects (which can happen if a parent task spawns multiple child tasks that throw exceptions) . It contains an InnerExceptions property that returns a ReadOnlyCollection<Exception> object . Do not confuse the InnerExceptions property with the InnerException property, which the AggregateException class inherits from the System.Exception base class . For the example above, element 0 of AggregateException s InnerExceptions property would refer to the actual System.OverflowException object thrown by the compute-bound method (Sum) . As a convenience, AggregateException overrides Exception s GetBaseException method . AggregateException s implementation returns the innermost AggregateException that is the root cause of the problem (assuming that there is just one innermost exception in the collection) . AggregateException also offers a Flatten method that creates a new AggregateException, whose InnerExceptions property contains a list of exceptions produced by walking the original AggregateException s inner exception hierarchy . Finally, AggregateException also provides a Handle method that invokes a callback method for each exception contained in the AggregateException . The callback can then decide, for each exception, how to handle the exception; the callback returns true to consider the
Painting Bar Code In C#.NET
Using Barcode maker for .NET Control to generate, create barcode image in Visual Studio .NET applications.
www.OnBarcode.com
Creating Planet In Visual C#
Using Barcode printer for .NET Control to generate, create USPS PLANET Barcode image in Visual Studio .NET applications.
www.OnBarcode.com
26
Paint QR Code In Java
Using Barcode generator for BIRT reports Control to generate, create QR Code image in BIRT applications.
www.OnBarcode.com
PDF-417 2d Barcode Encoder In None
Using Barcode generation for Office Excel Control to generate, create PDF417 image in Excel applications.
www.OnBarcode.com
Compute-Bound Asynchronous Operations
QR Code JIS X 0510 Maker In Java
Using Barcode creator for Java Control to generate, create QR image in Java applications.
www.OnBarcode.com
UPC-A Supplement 5 Creation In Java
Using Barcode maker for Android Control to generate, create UPC-A Supplement 5 image in Android applications.
www.OnBarcode.com
exception handled and false if not . If, after calling Handle, at least one exception is not handled, then a new AggregateException object is created containing just the unhandled exceptions and the new AggregateException object is thrown . Later in this chapter, I show examples using the Flatten and Handle methods . Important If you never call Wait or Result or query a Task s Exception property, then your code never observes that this exception has occurred . This is not ideal, as your program has experienced an unexpected problem that you are not aware of . So, when a Task object is garbage collected, its Finalize method checks to see if the Task experienced an unobserved exception; if it has, Task s Finalize method throws the AggregateException . Since you cannot catch an exception thrown by the CLR s finalizer thread, your process is terminated immediately . You must fix your code by invoking one of the aforementioned members, ensuring that your code observes the exception and recovers from it .
Quick Response Code Scanner In .NET Framework
Using Barcode recognizer for .NET framework Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
Data Matrix Maker In Java
Using Barcode encoder for Java Control to generate, create DataMatrix image in Java applications.
www.OnBarcode.com
To help you detect unobserved exceptions, you can register a callback method with TaskScheduler s static UnobservedTaskException event . This event is raised by the CLR s finalizer thread whenever a Task with an unobserved exception is garbage collected . When raised, your event handler method will be passed an UnobservedTaskExceptionEventArgs object containing the unobserved AggregateException . You can call UnobservedTaskExceptionEventArgs s SetObserved method to indicate that you ve processed the exception, thus preventing the CLR from terminating the process . However, you should not do this as a standard policy . As discussed in 20, it is better for a process to terminate instead of running with corrupted state .
GTIN - 13 Generation In None
Using Barcode maker for Software Control to generate, create EAN-13 Supplement 5 image in Software applications.
www.OnBarcode.com
Decode Bar Code In Java
Using Barcode decoder for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
In addition to waiting for a single task, the Task class also offers two static methods that allow a thread to wait on an array of Task objects . Task s static WaitAny method blocks the calling thread until any of the Task objects in the array have completed . This method returns an Int32 index into the array indicating which Task object completed, causing the thread to wake and continue running . The method returns -1 if the timeout occurs and throws an OperationCanceledException if WaitAny is canceled via a CancellationToken . Similarly, the Task class has a static WaitAll method that blocks the calling thread until all the Task objects in the array have completed . The WaitAll method returns true if all the Task objects complete and false if a timeout occurs; an OperationCanceledException is thrown if WaitAll is canceled via a CancellationToken .
Copyright © OnBarcode.com . All rights reserved.