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// Error! Can't change a constant! // MyMathClass.PI = 3.1444; Console.ReadLine(); } } } Notice that you are referencing the constant data defined by MyMathClass using a class name prefix (i.e., MyMathClass.PI). This is due to the fact that constant fields of a class are implicitly static. However, it is permissible to define and access a local constant variable within a type member. By way of example: static void LocalConstStringVariable() { // A local constant data point can be directly accessed. const string fixedStr = "Fixed string Data"; Console.WriteLine(fixedStr); // Error! fixedStr = "This will not work!"; } Regardless of where you define a constant piece of data, the one point to always remember is that the initial value assigned to the constant must be specified at the time you define the constant. Thus, if you were to modify your MyMathClass in such a way that the value of PI is assigned in a class constructor as follows: class MyMathClass { // Try to set PI in ctor public const double PI; public MyMathClass() { // Error! PI = 3.14; } } you would receive a compile-time error. The reason for this restriction has to do with the fact the value of constant data must be known at compile time. Constructors, as you know, are invoked at runtime. rdlc ean 13 EAN - 13 Client Report RDLC Generator | Using free sample for EAN ...
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Features: - Linear, Postal, MICR & 2D Barcode Symbologies - Crystal Reports for .NET / ReportViewer RDLC support - Save barcode images in image files ... When Drupal runs the action_info hook so that each module can declare the actions it provides, Drupal also gives modules a chance to modify that information including information provided by other modules. Here is how we would make the Block current user action available to the comment insert trigger: /** * Implementation of hook_drupal_alter(). Called by Drupal after * hook_action_info() so modules may modify the action_info array. * * @param array $info * The result of calling hook_action_info() on all modules. */ function beep_action_info_alter(&$info) { // Make the "Block current user" action available to the // comment insert trigger. if (!in_array("comment_insert", $info['user_block_user_action']['triggers'])) { $info['user_block_user_action']['triggers'][] = 'comment_insert'; } } The end result is that the Block current user action is now assignable, as shown in Figure 3-6. rdlc ean 13 Packages matching RDLC - NuGet Gallery
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R2 is the same value as X. Thus, the outcome of a sequence of two XORs using the same value produces the original value. To see this feature of the XOR in ... Closely related to constant data is the notion of read-only field data (which should not be confused with a read-only property). Like a constant, a read-only field cannot be changed after the initial assignment. However, unlike a constant, the value assigned to a read-only field can be determined at runtime, and therefore can legally be assigned within the scope of a constructor, but nowhere else. This can be very helpful when you don t know the value of a field until runtime, perhaps because you need to read an external file to obtain the value, but wish to ensure that the value will not change after that point. For the sake of illustration, assume the following update to MyMathClass: The following variables are set by the shell: rdlc ean 13 RDLC EAN 13 Creator generate EAN 13(UCC-13 ... - Avapose.com
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Barcode Generator for .NET RDLC Reports, integrating bar coding features into . NET RDLC Reports project. Free to download evaluation package. class MyMathClass { // Read-only fields can be assigned in ctors, // but nowhere else. public readonly double PI; public MyMathClass () { PI = 3.14; } } Again, any attempt to make assignments to a field marked readonly outside the scope of a constructor results in a compiler error: class MyMathClass { public readonly double PI; public MyMathClass () { PI = 3.14; } // Error! public void ChangePI() { PI = 3.14444;} } Because of the action we have assigned, when a new comment is posted, the current user will be blocked. Let s take a closer look at how that happens. We already know that Drupal s way of notifying modules that certain events are happening is to fire a hook. In this case, it is the comment hook. The particular operation that is happening is the insert operation, since a new comment is being added. The trigger module implements the comment hook. Inside this hook, it asks the database if there are any actions assigned to this particular trigger. The database gives it information about the Block current user action that we assigned. Now the trigger module gets ready to execute the action, which has the standard action function signature example_action($object, $context). But we have a problem. The action that is about to be executed is an action of type user, not comment. It expects the object it receives to be a user object! But here, a user action is being called in the context of a comment hook. Information about the comment was passed to the hook, not information about the user. What should we do What actually happens is that the trigger module determines that our action is a user action and loads the $user object that a user action expects. Here is code from modules/trigger/trigger.module that shows how this happens: Unlike a constant field, read-only fields are not implicitly static. Thus, if you wish to expose PI from the class level, you must explicitly make use of the static keyword. If you know the value of a static read-only field at rdlc ean 13 RDLC Report Barcode - Reporting Definition Language Client-Side
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