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NET 4. It contains useful and in-depth information on all the conceptual foundations of C ; and at the same time, teaches you how to implement each language concept programmatically, by providing most appropriate examples with full explanations. This unique book on C provides more coverage of C than any other book; no doubt, every aspect of the book is worth its price. Table of Contents Part I: Introducing ASP.
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In this Tutorial we will use Visual Studio and C.
If it finds one, it will pass the instance reference as the first argument to that extension method, then the rest of the arguments, if any, will be passed as subsequent arguments to the extension method. Otherwise, it can be a bit confusing, especially at first. This is especially true when looking at code samples online, or at any other pre-written code. Even developers who are familiar with extension methods still get caught occasionally, when there is a method with the same name on the object, but its method signature differs in a subtle way from that of the extension method.
Use of extension methods in C libraries is becoming increasingly prevalent. The more modern the framework, the more likely it is that it will incorporate extension methods. Of course, you can write your own extension methods as well.
Realize, however, that while extension methods appear to get invoked just like regular instance methods, this is really just an illusion. The number of options available can definitely work to your advantage. Take a little extra time upfront to research and choose the optimal collection type for your purpose.
It will likely result in better performance and less room for error. To take advantage of the type safety of C , you should usually prefer a generic interface over a non-generic one. The elements of a generic interface are of the type you specify when you declare your object, whereas the elements of non-generic interfaces are of type object. Another common C problem is to write your own collection object.
NET offers, you can probably save a lot of time by using or extending one that already exists, rather than reinventing the wheel. Many types of objects encapsulate some other type of system resource e.
Leaving these resources open can quickly deplete the total number of system resources, degrading performance and ultimately leading to program faults. They are called by the garbage collector on a separate thread, which can cause additional complications at an indeterminate time in the future.
Trying to get around these limitations by forcing garbage collection with GC. Collect is not a C best practice , as that will block the thread for an unknown amount of time while it collects all objects eligible for collection. Resource leaks are a concern in almost any environment.
However, C provides a mechanism that is robust and simple to use which, if utilized, can make leaks a much rarer occurrence. Any object which implements IDisposable expects to have that method called whenever the consumer of the object is finished manipulating it.
This results in explicit, deterministic freeing of resources.
If you are creating and disposing of an object within the context of a single code block, it is basically inexcusable to forget to call Dispose , because C provides a using statement that will ensure Dispose gets called no matter how the code block is exited whether it be an exception, a return statement, or simply the closing of the block.
OpenRead "foo. Common C Programming Mistake 9: Shying away from exceptions C continues its enforcement of type safety into runtime. However, once again, programmers can squander this great feature, leading to C problems.
That would likely result in an eventual NullReferenceException, which could possibly surface at a much later time, making it much harder to track down the source of the problem.
In contrast, Method 1 would have immediately thrown an InvalidCastException making the source of the problem much more immediately obvious. Moreover, even if you remember to check the return value in Method 2, what are you going to do if you find it to be null?
Is there something else you can try if that cast fails? If not, then throwing an exception is the correct thing to do, so you might as well let it happen as close to the source of the problem as possible.
Here are a couple of examples of other common pairs of methods where one throws an exception and the other does not: int. While there are certain select cases where this may be true, it is not at all correct as a generalization.
As a specific example, in a case where you have an alternative legitimate e. In such a case, it may indeed be better to write something like this: if int. Use the correct one for the context you are in, remembering that exceptions can certainly be your friend as a developer.