C# 1001 notes

2022-03-30 17:35:00 Открыть/Комментировать

2022-03-29 18:20:00 What is difference between late binding and early binding in C#?

Early Binding or Static Binding. The name itself describes that compiler knows about what kind of object it is, what are all the methods and properties it contains. As soon as you declared the object, .NET Intellisense will populate its methods and properties on click of the dot button.

Late Binding or Dynamic Binding. The name itself describes that compiler does not know what kind of object it is, what are all the methods and properties it contains. You have to declare it as an object, later you need get the type of the object, methods that are stored in it. Everything will be known at the run time. Открыть/Комментировать

2022-03-24 17:19:00 ​​ What do the following acronyms in .NET stand for: IL, CIL, MSIL, CLI and JIT?

IL, or Intermediate Language, is a CPU independent partially compiled code. IL code will be compiled to native machine code using current environmental properties by Just-In-Time compiler (JIT). JIT compiler translates the IL code to an assembly code and uses the CPU architecture of the target machine to execute a .NET application. In .NET, IL is called Common Intermediate Language (CIL), and in the early .NET days it was called Microsoft Intermediate Language (MSIL).

CLI, or Common Language Infrastructure, is an open specification developed by Microsoft. It is a compiled code library used for deployment, versioning, and security. In .NET there are two CLI types: process assemblies (EXE) and library assemblies (DLL). CLI assemblies contain code in CIL, and as mentioned, during compilation of CLI programming languages, the source code is translated into CIL code rather than into platform or processor specific object code.

To summary:
- When compiled, source code is first translated to IL (in .NET, that is CIL, and previously called MSIL).
- CIL is then assembled into a bytecode and a CLI assembly is created.
- Before code execution, CLI code is passed through the runtime’s JIT compiler to generate native machine code.
- The computer’s processor executes the native machine code. Открыть/Комментировать

2022-03-23 17:35:00 Открыть/Комментировать

2022-03-22 18:20:00 What interface should your data structure implement to make the Where method work?

Implementing IEnumerable makes using foreach and where possible.

IEnumerable interface contains the System.Collections.Generic namespace.

IEnumerable interface is a generic interface which allows looping over generic or non-generic lists.

IEnumerable interface also works with linq query expression.

IEnumerable interface Returns an enumerator that iterates through the collection. Открыть/Комментировать

2022-03-17 17:19:00 ​​ Explain what inheritance is, and why it’s important

Inheritance is one of the most important concepts in object-oriented programming, together with encapsulation and polymorphism. Inheritance allows developers to create new classes that reuse, extend, and modify the behavior defined in other classes. This enables code reuse and speeds up development. With inheritance, developers can write and debug one class only once, and then reuse that same code as the basis for the new classes. The class whose members are inherited is called the base class, and the class that inherits those members is called the derived class. By default, all classes in .NET are inheritable. Открыть/Комментировать

2022-03-16 17:35:00 Открыть/Комментировать

2022-03-15 18:20:00 Test if a Number belongs to the Fibonacci Series

A positive integer ω is a Fibonacci number if and only one of:

5ω^2 + 4 and

5ω^2 - 4

is a perfect square or a square number.

A square number is the result when a number has been multiplied by itself. Открыть/Комментировать

2022-03-01 18:20:00 Why to use of the IDisposable interface?

The "primary" use of the IDisposable interface is to clean up unmanaged resources. Note the purpose of the Dispose pattern is to provide a mechanism to clean up both managed and unmanaged resources and when that occurs depends on how the Dispose method is being called. Открыть/Комментировать

2022-02-22 19:20:00 The answer to the previous question is: yes, you can catch System.Exception and switch on the exception types. Открыть/Комментировать