Introduction to Functions in C#

Prologue to Functions in C# In C#, a capacity is a method of bundling code that accomplishes something and afterward restores the value. Unlike in C, C and some different dialects, capacities don't exist without anyone else. They are a piece of an item situated way to deal with programming. A program to oversee spreadsheets may incorporate an aggregate() work as a feature of an article, for instance. In C#, a capacity can be known as a part work it is an individual from a class-however that phrasing is left over from C. The typical name for it is a strategy. The Instance Method There are two kinds of strategies: occasion strategy and static technique. This presentation covers the case strategy. The model beneath characterizes a straightforward class and calls it Test. This model is a straightforward comfort program, so this is permitted. For the most part, the top of the line characterized in the C# document must be the structure class. Its conceivable to have a vacant class like this class Test { }, yet it isnt helpful. In spite of the fact that it looks vacant, it-like all C# classes-acquires from the Object that contains it and incorporates a default constructorâ in the principle program. var t new Test(); This code works, however it wont do anything when run with the exception of make a case t of the vacant test class. The code beneath includes a capacity, a strategy that yields the word Hello. utilizing System;namespace funcex1{class Test{public void SayHello(){Console.WriteLine(Hello) ;}}class Program{static void Main(string[] args){var t new Test() ;t.SayHello() ;Console.ReadKey() ;}}} This code model incorporates Console.ReadKey(), so when it runs, it shows the support window and anticipates a key section, for example, Enter, Space or Return (not the move, Alt or Ctrl keys). Without it, it would open the comfort Window, yield Hello and afterward close all in a matter of seconds. The capacity SayHello is about as straightforward a capacity as you can have. Its an open capacity, which implies the capacity is obvious from outsideâ the class. On the off chance that you evacuate the word open and attempt to order the code, it falls flat with an assemblage blunder funcex1.test.SayHello() is blocked off because of its assurance level. On the off chance that you include the word private where the word open was and recompile, you get the equivalent aggregate blunder. Simply transform it back to open. The word void in the capacity implies that the capacity doesn't restore any qualities. Commonplace Function Definition Characteristics Access level: open, private in addition to some othersReturn esteem: void or any sort, for example, intMethod Name: SayHelloAny strategy boundaries: none for the present. These are characterized in the sections () after the technique name The code for the meaning of another capacity, MyAge(), is: open int MyAge(){return 53;} Include that directly after the SayHello() strategy in the main model and include these two lines before Console.ReadKey(). var age t.MyAge();Console.WriteLine(David is {0} years old,age); Running the program presently yields this: Hi David is 53 years of age, The var age t.MyAge(); call to the technique restored the worth 53. Its not the most valuable capacity. An increasingly helpful model is the spreadsheet Sum work with a variety of ints, the beginning record and the quantity of qualities to total. This is the capacity: open buoy Sum(int[] values, int startindex, int endindex){var all out 0;for (var indexstartindex; indexendindex; index){total values[index];}return total;} Here are three use cases. This is the code to include Main() and call to test the Sum work. var esteems new int[10] {1, 2, 3, 4, 5, 6, 7, 8, 9,10};Console.WriteLine(t.Sum(values,0,2));/Should be 6Console.WriteLine(t.Sum(values,0,9));/ought to be 55Console.WriteLine(t.Sum(values,9,9));/ought to be 10 as ninth worth is 10 The For circle includes the qualities in the range startindex to endindex, so for startindex 0 and endindex2, this is the aggregate of 1 2 3 6. While for 9,9, it just includes the one values[9] 10. Inside the capacity, the neighborhood variable all out is instated to 0 and afterward has the significant pieces of the cluster esteems included.