The results of Listing 1914 appear in Output 1910 in Visual C#.NET

Generate QR Code 2d barcode in Visual C#.NET The results of Listing 1914 appear in Output 1910
The results of Listing 1914 appear in Output 1910
QR Code Creator In Visual C#
Using Barcode generator for .NET Control to generate, create QR Code ISO/IEC18004 image in Visual Studio .NET applications.
OUTPUT 1910:
Barcode Encoder In C#
Using Barcode creation for Visual Studio .NET Control to generate, create barcode image in Visual Studio .NET applications.
http://wwwintelliTechturecom 2936 KB
QR Code JIS X 0510 Printer In .NET
Using Barcode encoder for ASP.NET Control to generate, create QR image in ASP.NET applications.
As mentioned, the key aspect of the APM is the pair of BeginX and EndX methods with well-established signatures The BeginX returns a System IAsyncResult object providing access to the state of the asynchronous call in order to wait or poll for completion The EndX method then takes this return as an input parameter This pairs up the two methods so that it is
Print QR-Code In .NET
Using Barcode maker for .NET framework Control to generate, create QR Code image in .NET framework applications.
19: Synchronization and More Multithreading Patterns
QR Code JIS X 0510 Generator In Visual Basic .NET
Using Barcode drawer for .NET Control to generate, create QR Code 2d barcode image in .NET applications.
clear which BeginX method call pairs with which EndX method call The nature of the APM requires that for all BeginX invocations there must be exactly one EndX invocation, so no two calls to EndX for the same IAsyncResult instance should occur In Listing 1914, we also use the IAsyncResult s WaitHandle to determine when the asynchronous method completes As we iteratively poll the WaitHandle we print out periods to the console indicating that the download is running Following that, we call EndGetResponse() The EndX method serves four purposes First, calling EndX will block further execution until the work requested completes successfully (or errors out with an exception) Second, if method X returns data, this data is accessible from the EndX method call Third, if an exception occurs while performing the requested work, the exception will be rethrown on the call to EndX, ensuring that the exception is visible to the calling code as though it had occurred on a synchronous invocation Finally, if any resource needs cleanup due to X s invocation, EndX will be responsible for cleaning up these resources
Painting Barcode In Visual C#
Using Barcode generation for .NET framework Control to generate, create bar code image in .NET applications.
APM Signatures
Encode Barcode In Visual C#
Using Barcode creation for VS .NET Control to generate, create barcode image in Visual Studio .NET applications.
Together, the combination of the BeginX and EndX APM methods should match the synchronous version of the signature Therefore, the return parameter on EndX should match the return parameters on the X method (GetReponse() in this case) Furthermore, the input parameters on the BeginX method also need to match In the case of WebRequestGetResponse() there are no parameters, but let s consider a fictitious synchronous method, bool TryDoSomething(string url, ref string data, out string[] links) The parameters map from the synchronous method to the APM methods as shown in Figure 191
Code 3 Of 9 Drawer In C#
Using Barcode generator for Visual Studio .NET Control to generate, create Code39 image in .NET framework applications.
S y s t e m I A s y n c R e s u l t B e g i n T r y D o S o m e t h i n g( S t r i n g u r l , r e f s t r i n g d a t a , o u t s tring[] links, S y s t e m AsyncCallback callback, o b j ect state) bool TryDosomething( s t r i n g u r l , r e f s t r i n g d a t a , o u t s tring[] links) b o o l E n d T r y D o S o m e t h i n g (r e f s t r i n g d a t a, out string[] links, S y s t e m IAyncResult result);
Code 128 Code Set B Creator In Visual C#
Using Barcode creator for .NET framework Control to generate, create Code 128 Code Set B image in .NET framework applications.
Figure 191: APM Parameter Distribution
ECC200 Generation In Visual C#.NET
Using Barcode generation for .NET Control to generate, create Data Matrix image in .NET applications.
Asynchronous Programming Model
Code 128C Drawer In Visual Studio .NET
Using Barcode maker for ASP.NET Control to generate, create Code128 image in ASP.NET applications.
All input parameters map to the BeginX method Similarly, the return parameter maps to the EndX return parameter Also, notice that since ref and out parameters return results, these are included in the EndX method signature In contrast, since url is only an input parameter, it is not included in the EndX method
Barcode Generator In VS .NET
Using Barcode generator for ASP.NET Control to generate, create barcode image in ASP.NET applications.
Continuation Passing Style (CPS) with AsyncCallback
Bar Code Reader In Java
Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications.
There are two additional parameters on the BeginX method that were not included in the synchronous method These are the callback parameter, a SystemAsyncCallback delegate to be called when the method completes, and a state parameter of type object Listing 1915 demonstrates how they are used (The output is the same as Output 1910)
Making Data Matrix ECC200 In Java
Using Barcode generator for Java Control to generate, create ECC200 image in Java applications.
Paint Code39 In VS .NET
Using Barcode maker for ASP.NET Control to generate, create Code 39 Full ASCII image in ASP.NET applications.
Barcode Generation In Visual Studio .NET
Using Barcode drawer for .NET Control to generate, create barcode image in Visual Studio .NET applications.
Print Bar Code In .NET
Using Barcode creator for .NET Control to generate, create barcode image in .NET applications.