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Best way to make data (that may change during run-time) accessible to the whole application?
I have a C# library.
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Yes, you can declare a global variable of any type, class or not. Or you can have a "setter" function that is used to set or reinitialize the object.
To declare global variables in C++, we can declare variables after starting the program. Not inside any function or block. If we want to declare some variables that will be stored in some different file, then we can create one file, and store some variable.
A global object is an object that always exists in the global scope.
In C# you cannot define true global variables (in the sense that they don't belong to any class). You can then retrieve the defined values anywhere in your code (provided it's part of the same namespace ): String code = Globals. CODE_PREFIX + value.
In the C++ language generally we create an object of class in a main () function or member function but it is also possible to create a object globally. Such object are called global object.
However, you can make a global variable by creating a static class in a separate class file in your application. First, create a class called global in your application with the code given below. The class also has a static variable. Now, you can access it from anywhere in your forms after assigning a value to it.
Global scope. By default, global variables are of global scope. Which means we can access a global variable everywhere in same as well as other C programs (using extern). Example program to use global scope variables. First let us create a C program that contains only global variables, save the below program with name global.c.
Global variables are variables declared outside a function. Unlike local variables and static variables, a global variable is not declared inside a function. Properties of a global variable Global variables are allocated within data segment of program instead of C stack.
In C# I always use a static classes to provide this functionality. Static classes are covered in detail here, but briefly they contain only static members and are not instantiated -- essentially they are global functions and variables accessed via their class name (and namespace.)
Here is a simple example:
public static class Globals
{
public static string Name { get; set; }
public static int aNumber {get; set; }
public static List<string> onlineMembers = new List<string>();
static Globals()
{
Name = "starting name";
aNumber = 5;
}
}
Note, I'm also using a static initializer which is guaranteed to run at some point before any members or functions are used / called.
Elsewhere in your program you can simply say:
Console.WriteLine(Globals.Name);
Globals.onlineMemeber.Add("Hogan");
Static objects are only "created" once. Thus everywhere your application uses the object will be from the same location. They are by definition global. To use this object in multiple places simply reference the object name and the element you want to access.
You can add static members to any class and they will be globally available, but I think having one place for globals is a better design.
189
You can use public static properties on a class as global objects/variables.
You can initialize static properties in a static constructor for the class, which will be called directly before the first time the properties are accessed.
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