C# Call Function From Another Program Being InstalledFunctions in C# - Introduction and Tutorial. In the previous tutorial, we looked at an object oriented approach to programming and we'll return to that again in the future but in this tutorial I'll be covering functions. Download a zip file with the complete source code for this tutorial. A function is a way of packaging up code that does something, say like calculating the total of an array of ints and then returns the value. However unlike C/C++ and some other languages, functions do not exist by themselves. They are part of an object- defined in a class or sometimes in a struct. If we were for example creating a program to manage spreadsheets (i. C# Call Function From Another Program Like SkypeWe'll look at static methods in the next tutorial. Let's define a simple class and call it test. I've created it it before the class Program. Note, in this example it's just a simple console program so this is allowed. In a Winforms application, the first class defined in the C# file must be the form class. The form designer gets upset if you don't do this. It's possible to have a completely empty class like this class Test . Actually, although it looks empty, it (like all C# classes) inherits from Object and includes a default constructor so in the main program . It still won't do anything when run except create an instance t of the empty test class. So let's add our first function, a method that will output the word Hello. Without it, it would open the console Window, output Hello then close it all in the blink of an eye. The function Say. Hello is about as simple as you can have a function. It's a public function which means the function is visible from outside of the class. Try removing the word public and try and compile it now. It will fail with a compilation error 'funcex. Say. Hello()' is inaccessible due to its protection level. If you add the word private where the word public was (i. Just change it back to public. The word void in the function means that our function does not return any values. More formally a function is defined with these characteristics: Access level - public, private plus some others. Return value> - void or any type such as int. Method Name - Say.
Hello. Any method parameters - none for now- these are defined in the brackets () after the method name. Let's define another function My. Age(). It's not the most useful function so let's finish this tutorial with something a bit more useful. A program causes the statements to be executed by calling the method and specifying any required method arguments. Once the program is executing. This is our Excel like Sum function. We'll pass in an array of ints, the start index and the number of values to sum. This is the function: public float Sum(int. This is the code to add in Main() and call to test the Sum function. Whereas for 9,9, it just adds the one values. In the next one we'll see more advanced uses.
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