qr code c# open source PART II in Visual C#

Making QR Code in Visual C# PART II

PART II
QR Code JIS X 0510 Generation In C#.NET
Using Barcode generation for .NET Control to generate, create QR Code image in .NET applications.
Scan QR In Visual C#.NET
Using Barcode scanner for VS .NET Control to read, scan read, scan image in .NET framework applications.
// Just wait on the continuation taskContWait(); tskDispose(); taskContDispose(); ConsoleWriteLine("Main thread ending"); } }
Generate Bar Code In C#.NET
Using Barcode encoder for .NET framework Control to generate, create barcode image in VS .NET applications.
Scan Bar Code In C#.NET
Using Barcode scanner for .NET Control to read, scan read, scan image in .NET applications.
The output is shown here:
Print QR Code 2d Barcode In VS .NET
Using Barcode creation for ASP.NET Control to generate, create QR Code image in ASP.NET applications.
Quick Response Code Generator In .NET
Using Barcode encoder for VS .NET Control to generate, create QR Code JIS X 0510 image in .NET applications.
Main thread starting MyTask() starting In MyTask() count is 0 In MyTask() count is 1 In MyTask() count is 2 In MyTask() count is 3 In MyTask() count is 4 MyTask terminating Continuation starting Continuation count is 0 Continuation count is 1 Continuation count is 2 Continuation count is 3 Continuation count is 4 Continuation terminating Main thread ending
Creating QR Code ISO/IEC18004 In Visual Basic .NET
Using Barcode drawer for Visual Studio .NET Control to generate, create QR Code image in Visual Studio .NET applications.
Make Code 128 Code Set A In Visual C#
Using Barcode drawer for .NET Control to generate, create ANSI/AIM Code 128 image in .NET framework applications.
As the output shows, the second task did not begin until the first task completed Also notice that it was necessary for Main( ) to wait only on the continuation task This is because MyTask( ) will be finished before ContTask begins Thus, there is no need to wait for MyTask( ), although it would not be wrong to do so As a point of interest, it is not uncommon to use a lambda expression as a continuation task For example, here is another way to write the continuation used in the preceding program:
Data Matrix Encoder In Visual C#.NET
Using Barcode generator for .NET Control to generate, create ECC200 image in VS .NET applications.
Painting 2D Barcode In C#.NET
Using Barcode maker for Visual Studio .NET Control to generate, create Matrix Barcode image in .NET framework applications.
// Here, a lambda expression is used as the continuation Task taskCont = tskContinueWith((first) => { ConsoleWriteLine("Continuation starting"); for(int count = 0; count < 5; count++) {
Linear Barcode Generator In Visual C#.NET
Using Barcode drawer for Visual Studio .NET Control to generate, create Linear Barcode image in .NET framework applications.
USS-93 Generation In Visual C#.NET
Using Barcode drawer for Visual Studio .NET Control to generate, create USS-93 image in Visual Studio .NET applications.
Part II:
Universal Product Code Version A Encoder In None
Using Barcode creation for Software Control to generate, create UPC A image in Software applications.
Paint Code 39 Full ASCII In None
Using Barcode encoder for Font Control to generate, create USS Code 39 image in Font applications.
Exploring the C# Library
UCC - 12 Recognizer In None
Using Barcode recognizer for Software Control to read, scan read, scan image in Software applications.
EAN13 Maker In Objective-C
Using Barcode generator for iPad Control to generate, create EAN 13 image in iPad applications.
ThreadSleep(500); ConsoleWriteLine("Continuation count is " + count ); } ConsoleWriteLine("Continuation terminating"); } );
ECC200 Maker In .NET
Using Barcode creation for .NET framework Control to generate, create Data Matrix 2d barcode image in .NET framework applications.
Code 128 Code Set B Scanner In VB.NET
Using Barcode decoder for .NET framework Control to read, scan read, scan image in VS .NET applications.
Here, the parameter first receives the antecedent task (which is tsk in this case) In addition to ContinueWith( ) provided by Task, there are other methods that support task continuation provided by TaskFactory These include various forms of ContinueWhenAny( ) and ContinueWhenAll( ), which continue a task when any or all of the specified tasks complete, respectively
GTIN - 12 Creation In Java
Using Barcode printer for Java Control to generate, create GTIN - 12 image in Java applications.
Recognizing UPCA In Visual Basic .NET
Using Barcode reader for .NET framework Control to read, scan read, scan image in VS .NET applications.
Returning a Value from a Task
A task can return a value This is a very useful feature for two reasons First, it means that you can use a task to compute some result This supports parallel computation Second, the calling process will block until the result is ready This means that you don t need to do any special synchronization to wait for the result To return a result, you will create a task by using the generic form of Task, which is Task<TResult> Here are two of its constructors: public Task(Func<TResult> function) public Task(Func<Object, TResult> function, Object state) Here, function is the delegate to be run Notice that it is of type Func rather than Action Func is used when a task returns a result The first form creates a task that takes no arguments The second form creates a task that takes an argument of type Object passed in state Other constructors are also available As you might expect, there are also versions of StartNew( ) provided by TaskFactory<TResult> that support returning a result from a task Here are the ones that parallel the Task constructors just shown: public Task<TResult> StartNew(Func<TResult> function) public Task<TResult> StartNew(Func<Object,TResult> function, Object state) In all cases, the value returned by the task is obtained from Task s Result property, which is defined like this: public TResult Result { get; internal set; } Because the set accessor is internal, this property is effectively read-only relative to external code The get accessor won t return until the result is ready Thus, retrieving the result blocks the calling code until the result has been computed The following program demonstrates task return values It creates two methods The first is MyTask( ), which takes no parameters It simply returns the bool value true The second is SumIt( ), which has a single parameter (which is cast to int) and returns the summation of the value passed to that parameter
// Return a value from a task using System;
24:
M u l t i t h r e a d i n g , P a r t Tw o : E x p l o r i n g t h e Ta s k P a r a l l e l L i b r a r y a n d P L I N Q
using SystemThreading; using SystemThreadingTasks; class DemoTask { // A trivial method that returns a result and takes no arguments static bool MyTask() { return true; } // This method returns the summation of a positive integer // which is passed to it static int SumIt(object v) { int x = (int) v; int sum = 0; for(; x > 0; x--) sum += x; return sum; } static void Main() { ConsoleWriteLine("Main thread starting"); // Construct the first task Task<bool> tsk = Task<bool>FactoryStartNew(MyTask); ConsoleWriteLine("After running MyTask The result is " + tskResult); // Construct the second task Task<int> tsk2 = Task<int>FactoryStartNew(SumIt, 3); ConsoleWriteLine("After running SumIt The result is " + tsk2Result); tskDispose(); tsk2Dispose(); ConsoleWriteLine("Main thread ending"); } }
Copyright © OnBarcode.com . All rights reserved.