About C # C # is one of the development language for Microsoft's Common Language Runtime Mens Nike Free 3.0 V2 Shoes Black Gold (CLR) of. Thanks to such cross-language Ladies Nike Blazers High Tops Leopard Print YellowB integrated development language for the performance of CLR, exception handling, security enhancements, simplified model of component interactions, debugging and analysis services. For today's CLR speaking, C # is positioned to the Windows desktop, mobile device or Nike Basketball server environment, dealing with complex and professional development projects most widely used development language. C # is object-oriented, strongly typed language. C # in strict type checking at compile and run time, so typical programming errors can report as soon as possible, and to precisely give the wrong location. It can help programmers to save LeBron James Shoes a lot of time, compared to track those inexplicable errors can occur after a long time of the illegal operations, type-safe implementation of more freedom. However, many programmers unwittingly (or inadvertently) discard the benefits of this testing, it raises Nike Air Jordan 5 Women a number of issues discussed in this article. About this article describes C # programmer of the most common 10 programming errors or to avoid defects. Most errors are discussed in this article are specific to C # in other languages, and some also involves CLR or use Framework Class Library (FCL) of. Nike Air Jordan 6 Women Common Errors 1: Like value types using a reference type or opposite C ++ programmers, and many other programming languages programmers, accustomed to assign them to a variable value or whether only a reference to an object placed in an existing control. But in C #, this is a programmer to write the object, rather than by instantiating the object and assign it a value of programmers decision. This 378037 010 Original?CBlack-True Red-White Air Jordan 11 Retro Nike Kids Sneakers Factory Outlet is a C # novice common 'fool you,' examples. If you do not know the object you are using a value type or a reference type, you may encounter surprises. For example: Point point1 = new Point (20, 30); Point point2 = point1; point2.X = 50; Console.WriteLine (point1.X); // 20 (does this surprise you) Console.WriteLine (point2.X) ; // 50Pen pen1 = new Pen (Color.Black); Pen pen2 = pen1; pen2.Color = Color.Blue; Console.WriteLine (pen1.Color); // Blue (or does this surprise you) Console.WriteLine ( pen2.Color); // Blue As you can see, Point and Pen objects are created in exactly the same way. But after point1 in a new X coordinate value is set to point2 remain unchanged, while the value of pen1 in a new color value is set to pen2 after the change. Therefore, we can infer point1 and point2 contain a copy of the Point object, and pen1 and pen2 Pen contains a reference to the same object. But how can we not pass this test and know the result? The answer is to look at an object type definitions (in Visual Studio, you can easily get to put your cursor on the object type name and click F12): public struct Point {...} // defines 2015 Nike Free 5.0 a 'value' typepublic class Pen {... } // defines Nike Blazers a 'reference' type, as shown above, in C #, struct keyword is used to define the value types, while the keyword class is used to define a reference type. For C ++ programmers programming background, for C ++ and C # has many similar keywords and mistaken safe to do so, such behavior might be a surprise. If you want to rely on certain because value types and reference types and produce different behavior - such as pass an Nike Air Max object as a method parameter and change the state of the object of this behavior in the process - make sure you are dealing with the correct object Types of. Common Errors 2: Nike Air Max 2011 Men Misunderstanding defaults uninitialized variables in C #, value types can not be null. By definition, the value will be a value type, not even value type variable initialization also must have a value. This Mens Nike Free 3.0 V2 Shoes Black Blue is called the default value type. This causes when checking whether a variable initialization unexpected results, as follows: class Program {static Point point1; static Pen pen1; static void Main (string [] args) {Console.WriteLine (pen1 == null); // True Console.WriteLine (point1 == null); // False (huh)}} Why point1 not null? The answer is that Point is a value type, and the default value Point (0,0), not null. We do not realize that this is likely to commit a C # (and common) mistakes. Many (but not all) of the value of the type has a IsEmpty property, you can use this property to check whether the type of the value equal to its default value: Console.WriteLine (point1.IsEmpty); // True when you go to check whether a variable is initialized, make sure you know the type of uninitialized variables, some default values and does not depend on it as null. Common Error 3: Use string comparison method is inappropriate or not specifically designated are many different ways to compare strings in C #. Although many programmers use the == operator Mens Nike Free 3.0 V2 Shoes Grey Orange to compare strings, but in fact this is one of many ways the least desirable method, mainly because it is not explicitly required in the code which to compare. In contrast, in C # test string want to wait for the preferred way is to use the Equals method: public bool Equals (string value); public bool Equals (string value, StringComparison comparisonType); signature of the first method (for example, no comparisonType parameters) In fact, and use the == operator exactly the same, but with the benefits of a string of clear. It performs a string of serial comparison, basically byte comparison and bytes. In many cases, this is the type you want to compare, especially when comparing the value of the string parameter, such as file names, environment variables, properties and so on. In this case, as long as the sequence comparison indeed this is the case Air Jordan Outlet the correct type of comparison can be, the only drawback is the use of no comparisonType the Equals method will make some people reading your code you do not know what type of comparison to do Comparison. Use the Equals method with 541100-300 Black Green White Style Nike Lebron X 10 Outlet comparisonType parameters, every time you compare strings, although, not only will make your code more clear, and will make you clear that you need to use the type of comparison. It is worth doing, because although nothing English in order compare the differences between the language and regional comparison, but provides a lot of other languages, while ignoring the possibility of other languages was provided to make a lot of your own way in the future error possible. For example: string s = \u0026 quot; strasse \u0026 quot ;; // outputs False: Console.WriteLine (s == \u0026 quot; stra