In this article we will see Difference between Hashtable and Dictionary with example and when we have to use Hashtable and Dictionary in c. Difference between Dictionary and Hashtable Dictionary Dictionary is Genereic type which means we can use any data type with Dictionary.
A more powerful signaling construct is provided by the Monitor class, via the static methods Wait and Pulse and PulseAll. The principle is that you write the signaling logic yourself using custom flags and fields enclosed in lock statementsand then introduce Wait and Pulse commands to prevent spinning.
Furthermore, Wait and Pulse can be amenable in situations where all of the wait handles are parsimoniously challenged.
Wait and Pulse signaling, however, has some disadvantages over event wait handles: You must remember to protect all variables related to the signaling logic with locks.
Wait and Pulse also have a peculiar aversion to dabblers: Fortunately, there is a simple pattern of use that tames Wait and Pulse. In terms of performance, calling Pulse takes around a hundred nanoseconds on a era desktop — about a third of the time it takes to call Set on a wait handle.
The overhead for waiting on uncontended signal is entirely up to you — because you implement the logic yourself using ordinary fields and variables.
In practice, this is very simple and amounts purely to the cost of taking a lock. Define a single field for use as the synchronization object, such as: This pattern allows any thread to wait at any time for any condition.
Wait method does the following, in order: If the lock is contended, then it blocks until the lock is available. This means that despite appearances, no lock is held on the synchronization object while Monitor. Wait awaits a pulse: Wait is designed for use within a lock statement; it throws an exception if called otherwise.
The same goes for Monitor. As soon as we release the lock, the worker resumes execution, reiterating its while loop. The Pulse and PulseAll methods release threads blocked on a Wait statement. Pulse releases a maximum of one thread; PulseAll releases them all. In our example, just one thread is blocked, so their effects are identical.
If more than one thread is waiting, calling PulseAll is usually safest with our suggested pattern of use. In our pattern, pulsing indicates that something might have changed, and that waiting threads should recheck their blocking conditions. In the Work method, this check is accomplished via the while loop.What is the difference between an abstract function and a virtual function?
In which cases is it recommended to use virtual or abstract? Which is the more correct approach? Regular Expression Options.
03/30/; 46 minutes to read Contributors. all; In this article. By default, the comparison of an input string with any literal characters in a regular expression pattern is case sensitive, white space in a regular expression pattern is interpreted as literal white-space characters, and capturing groups in a regular expression are named implicitly as well as.
Exercise 1: Write C# code to declare a variable to store the age of a person.
Then the output of the program is as an example shown below. Regular Expression Options. 03/30/; 46 minutes to read Contributors. all; In this article. By default, the comparison of an input string with any literal characters in a regular expression pattern is case sensitive, white space in a regular expression pattern is interpreted as literal white-space characters, and capturing groups in a regular .
The first example calculates the size of files in a single directory.
The second computes the product of two matrices. Directory size example. This example is a simple command-line utility that calculates the total size of files in a directory. C# FAQ for C++ programmers. Andy McMullan. The C# FAQ for C++ programmers was first posted in Aug , and is regularly updated.
It answers many of the questions that C++ developers have when they first encounter C#.