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shared resource that can be used by only one thread at a time For example, when one thread is writing to a file, a second thread must be prevented from doing so at the same time Another situation in which synchronization is needed is when one thread is waiting for an event that is caused by another thread In this case, there must be some means by which the first thread is held in a suspended state until the event has occurred Then the waiting thread must resume execution The key to synchronization is the concept of a lock, which controls access to a block of code within an object When an object is locked by one thread, no other thread can gain access to the locked block of code When the thread releases the lock, the object is available for use by another thread The lock feature is built into the C# language Thus, all objects can be synchronized Synchronization is supported by the keyword lock Since synchronization was designed into C# from the start, it is much easier to use than you might first expect In fact, for many programs, the synchronization of objects is almost transparent The general form of lock is shown here: lock(lockObj) { // statements to be synchronized } Here, lockObj is a reference to the object being synchronized If you want to synchronize only a single statement, the curly braces are not needed A lock statement ensures that the section of code protected by the lock for the given object can be used only by the thread that obtains the lock All other threads are blocked until the lock is removed The lock is released when the block is exited The object you lock on is an object that represents the resource being synchronized In some cases, this will be an instance of the resource itself or simply an arbitrary instance of object that is being used to provide synchronization A key point to understand about lock is that the lock-on object should not be publically accessible Why Because it is possible that another piece of code that is outside your control could lock on the object and never release it In the past, it was common to use a construct such as lock(this) However, this works only if this refers to a private object Because of the potential for error and conceptual mistakes in this regard, lock(this) is no longer recommended for general use Instead, it is better to simply create a private object on which to lock This is the approach used by the examples in this chapter Be aware that you will still find many examples of lock(this) in legacy C# code In some cases, it will be safe In others, it will need to be changed to avoid problems The following program demonstrates synchronization by controlling access to a method called SumIt( ), which sums the elements of an integer array:. .net data matrix barcode Data Matrix VB . NET DLL - KeepAutomation.com
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Any googling? QRCode: Open Source QRCode Library[^] Datamatrix : http:// datamatrixnet.sourceforge. net /[^] PDF417: ... CheckStateChanged event 305 class hierarchy 71 class keyword 659 classes 6, 642 indexers 148 Clear method example (Graphics) 205 in ArrayList class 131 in CollectionBase class 132 in ListView class 444 ClearSelected method 324 example 332 Click event in Control class 104 in MenuItem class 82 Clickable value 444 Clicks property 390 ClientRectangle property 104 for Forms 17 Clipboard 282 Clipboard class 282 ClipRectangle property 205 Clone method in ColumnHeader class 456 CloneMenu method example (MenuItem) 100 in MainMenu class 77 in MenuItem class 82 Close method 197, 233 in Form class 88 relationship to Dispose 233 vs. Application.Exit method 88 CloseUp event 368 Closing event 197, 235 code documentation tag 675 code, Web Page documentation 42 Collapse method 495, 504 CollapseAll method 489, 504 CollectionBase class 130, 133 members 132 OnClear method 149 OnRemoveComplete method 150 datamatrix net documentation Packages matching DataMatrix - NuGet Gallery
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VB . NET Data Matrix Generator creates barcode Data Matrix images in VB . NET calss, ASP.NET websites. // Use lock to synchronize access to an object using System; using SystemThreading; class SumArray { int sum; object lockOn = new object(); // a private object to lock on public int SumIt(int[] nums) { 23: Color structure 120, 193 B method 260 G method 260 R method 260 RGB values 260 ColorDepth property 417 ColorDialog class 193 Colors window 401 Column property 461 ColumnClick event 444, 461 ColumnClickEventArgs class 461 example 464 ColumnHeader class displaying in Visual Studio 457 members 456 ColumnHeaderCollection class 477 ColumnHeaderStyle enumeration 444 Columns property 444, 455, 476 COM 128 ComboBox class 335 comparison with ListBox 334 FindString method 344 members 335 SelectedItem property 342 Text property 342 ComboBoxStyle enumeration 337 values 337 common dialogs 193 common image directory 406 CommonAppDataRegistry property 12 CommonDialog class 24, 193 Compare method 461 Comparer class 461 compiled 640 compiling .NET programs 5 complex data binding 588 Component class 72, 114 component tray 76, 99 lock(lockOn) { // lock the entire method sum = 0; // reset sum for(int i=0; i < numsLength; i++) { sum += nums[i]; ConsoleWriteLine("Running total for " + ThreadCurrentThreadName + " is " + sum); ThreadSleep(10); // allow task-switch } return sum; } asp.net data matrix DataMatrix . net / Wiki / Home - SourceForge
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6 Jan 2018 ... A C#/. net -library for encoding and decoding DataMatrix codes (based on a . net - port of libdmtx). DataMatrix . net also contains a small application ... components xxxii, 73 components field disposing of 420 const keyword 660 constants 643 constructors 8, 650 instance 650 invoking existing constructor 544 static 650 ContainerControl class 195 196 ActivateControl method 197 ActiveControl property 196 containers xxxii Contains method 129, 131 ContentAlignment enumeration 404 Contents value in StatusBarPanelAutoSize enumeration 115 context menu 70 ContextMenu class 73, 97 99 members 99 ContextMenu property 97, 99, 104, 290 example (PictureBox) 98 continue keyword 660 control forcing Paint event 93 Control class 53, 103, 105 AllowDrop property 625 BindingContext property 592 BringToFront method 555 ContextMenu property 99 ControlCollection class 18 DataBindings property 593, 595 DoDragDrop method 622 drag and drop 621 DragDrop event 624 DragEnter event 624 Focus method 307 GetStyle method 210 } } class MyThread { public Thread Thrd; int[] a; int answer; // Create one SumArray object for all instances of MyThread static SumArray sa = new SumArray(); // Construct a new thread public MyThread(string name, int[] nums) { a = nums; Thrd = new Thread(thisRun); ThrdName = name; ThrdStart(); // start the thread } // Begin execution of new thread void Run() { ConsoleWriteLine(ThrdName + " starting"); answer = saSumIt(a); ConsoleWriteLine("Sum for " + ThrdName + " is " + answer); ConsoleWriteLine(ThrdName + " terminating"); } } class Sync { static void Main() { int[] a = {1, 2, 3, 4, 5}; MyThread mt1 = new MyThread("Child #1", a); MyThread mt2 = new MyThread("Child #2", a); mt1ThrdJoin(); mt2ThrdJoin(); } } Part II: nuget datamatrix net DataMatrix.net 0.4.2 - NuGet Gallery
24 Nov 2013 ... See project site for more info - this is a packaging of the binaries hosted at Michael Faschinger's SourceForge site. * decode DataMatrix codes ... vb.net data matrix code Packages matching DataMatrix - NuGet Gallery
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