vb.net ocr read text from pdf

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The code in this listing has registered two subscribers (heaterOnTemperatureChanged and coolerOnTemperatureChanged) to the OnTemperatureChange delegate by directly assigning them using the += operator (As noted in the comment, you need to use the new operator with the TemperatureChangeHandler constructor if you are only using C# 10) By taking the temperature value the user has entered, you can set the CurrentTemperature of thermostat However, you have not yet written any code to publish the change temperature event to subscribers

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Invoking a Delegate Every time the CurrentTemperature property on the Thermostat class changes, you want to invoke the delegate to notify the subscribers (heater and cooler) of the change in temperature To do this, modify the CurrentTemperature property to save the new value and publish a notification to each subscriber The code modification appears in Listing 134

to synchronize static state and to leave out synchronization from any instance data Programmers that allow multiple threads to access a particular object must provide their own synchronization for the object Any class that explicitly deals with threads itself is likely to want to make instances thread safe to some extent

public class Thermostat { public float CurrentTemperature { get{return _CurrentTemperature;} set { if (value != CurrentTemperature) { _CurrentTemperature = value; // INCOMPLETE: Check for null needed // Call subscribers OnTemperatureChange(value); } } } private float _CurrentTemperature; }

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Now the assignment of CurrentTemperature includes some special logic to notify subscribers of changes in CurrentTemperature The call to notify all subscribers is simply the single C# statement, OnTemperatureChange(value)

This single statement publishes the temperature change to the cooler and heater objects Here, you see in practice that the ability to notify multiple subscribers using a single call is why delegates are more specifically known as multicast delegates

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Regardless of whether using the lock keyword or the Monitor class explicitly, it is crucial that programmers carefully select the lock object In the previous examples, the synchronization variable, _Sync, is declared as both private and read only It is declared as read only to ensure that the value is not changed between calls to MonitorEnter() and MonitorExit() This is important because there would otherwise be no correlation between the entering and exiting of the synchronized block of code Similarly, the code declares _Sync as private so that no other synchronization block outside the class can synchronize on the same object instance, thereby inappropriately causing the code to block If the data is public, then the synchronization object could be public so that other classes can synchronize using the same synchronization object instance The problem is that this makes deadlock avoidance more difficult Fortunately, the need for this pattern occurs rarely For public data, it is preferable to leave synchronization entirely outside the class, allowing the calling code to take locks with its own synchronization object One more important factor is that the synchronization object cannot be a value type If the lock keyword is used on a value type, then the compiler will report an error (In the case of the SystemThreadingMonitor class, however, no such error will occur at compile time Instead, the code will throw an exception with the call to MonitorExit(), indicating there was no corresponding MonitorEnter() call) The issue is that when using a value type, the runtime makes a copy of the value, places it in the heap (boxing occurs), and passes the boxed value to MonitorEnter() Similarly, MonitorExit() receives a boxed copy of the original variable The result is that MonitorEnter() and MonitorExit() receive different synchronization object instances so that no correlation between the two calls occurs.

Check for null One important event of publishing code is missing from Listing 134 If no subscriber registered to receive the notification, then OnTemperatureChange would be null and executing the OnTemperatureChange(value) statement would throw a NullReferenceException To avoid this, it is necessary to check for null before firing the event Listing 135 demonstrates how to do this

Why to Avoid Locking on this and typeof(type)

public class Thermostat { public float CurrentTemperature { get{return _CurrentTemperature;} set { if (value != CurrentTemperature) { _CurrentTemperature = value; // If there are any subscribers // then notify them of changes in // temperature TemperatureChangeHandler localOnChange = OnTemperatureChange; if(localOnChange != null) { // Call subscribers localOnChange(value); } } } } private float _CurrentTemperature; }

Instead of checking for null directly, first assign OnTemperatureChange to a second delegate variable, handlerCopy This simple modification ensures that if all OnTemperatureChange subscribers are removed (by a different

vb.net ocr read text from pdf

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vb.net ocr read text from pdf

vb.net ocr read text from pdf

vb.net ocr read text from pdf

vb.net ocr read text from pdf

vb.net ocr read text from pdf

vb.net ocr read text from pdf

vb.net ocr read text from pdf

vb.net ocr read text from pdf

vb.net ocr read text from pdf

vb.net ocr read text from pdf

vb.net ocr read text from pdf

vb.net ocr read text from pdf

vb.net ocr read text from pdf