Design Patterns With C# (Real World Samples)

What is Singleton Pattern and when we should use it?

When the scenarios got to complicated ones. Common code templates are falling from all ways. Because performance or any other important things are looking for best results. You can see it easily

I will design a common way ADO.NET code. First I wanna show the not prefered way.

We are bıilding up the code and it is time see the results. Before observing the things lets see what is working when working o a data...

We should understand after doing observations. And why are we using same class for different instances? This work types are the sign for using Singleton

That's all good. Now you can use this pattern not to overload an operation while you can do it once. Doing it as thread safe is the bonus for you ;)

Let's observe our work. You can see the one instance is doing same thing for us. Now we can relax for accessing data in good RAM usage

What is Singleton? It is time to use it on your projects. You will undertand better why we need this pattern if you get performance increase...

You can download the codes from this lecture

When we use many instances for same work or when you work with different types, your code can be more complex to understand. That is why we need Façade Pattern to manage instances

A weather data service will help us to understand. Lets look to the simple codes

If we want to make smarter the codes it can bee cool for any call and it would be nice o code design

Lucene is a third party dll to make fast searchs in the system. It is creating a file cache and search gives results faster than known options (SQL Server  direct search). See the codes and apply for for performance tests

What is Façade and why we need it to use?

Don't forget to download code and database file

If you have different processes for same work than factory pattern is for you. Let's learn something for İt

I will design a code way to understand what makes you use factory pattern. This bad way will make a decision point about wrting if - else blocks in your main method.

You will see how a factory works with different types. Actually we will make different type same from base. Lets see how it will do this operation

We have learn Factory pattern and maybe you want to apply it in some actions like we said here

This pattern like factory pattern but there are some differences. Lets see where should we use a strategy pattern.

There is a code sample about logging a content to both file system and sql server and to a ftp server. Code is working but not compatible to software principles. Lets analyze codes and prepare environment to apply our pattern

Our project needs some fixes. An interface and a context class will solve the problem.

We have learn Strategy Pattern. Dont forget to compare with Factory Pattern and see samples with log4Net

If you have a structural hierarchythen Composite pattern is for you. For example a user authorization or employee hierarcy. Lets meet with Composite pattern

Before completing our real world sample I wanted to set up our environment. I didn't want to pass sample with basic features. You can see it in the video

We have started to apply composite entity to hierarchical data template. Lets do the job. After watching video you will see the problems and bug. And we will solve them together

We have completed our operation. If you want to complete following operations taht would be a good sample for your archives.

We have completed Composite pattern. Try to create you application including composite pattern

You can download sample codes from here

New section is Builder Pattern and lets talk about it in this introduction video

I wanna show you bad way before how we need a builder pattern work. There is a search system in this video and we will just see how it is working.

Search system needs to obey to SOLID principle. At first Single Responsibility, Then Open - Close Principle. Because bad way method is making eveything in on way. We need split up the query and call them to build the results. Lets see how it works

Different work parts are working together to build something. We have seen how a builder pattern works

You can download the exercise files from here. Feel free to ask about anything

I want to introduce you Data Transfer Object Pattern. When we need a DTO? We will talk about that

We will do a database operation to create a necessity of Data Transfer Pattern

We have seen the bad way and we should handle this weird work. Lets see how can we do that

We have worked on Data Transfer Object Pattern. You can try your ways to appyle this logic.

You can download project codes from here

We will talk about Dependency Injection and I will say something about SOLID Principles - especially about Dependency Inversion Principle - 

When we need a dependency injection pattern? At first we will se some codes and we will talk about why we should use dependency injection for this codes

SOLID principles is one of the main book for software development. And dependency injection is a big schema to obey this rules. We have applied DI to bad way codes andnow we can expand our operation without doing overloading and duplication.

We talked about DI pattern. You will understand the importance of this pattern when you use it, trust me :) You can check hello world samples for dependency injection pattern on blog sites too.

You can download codes from here. Dont forget to use Northwind in you project

I wanna introduce you IoC Pattern. We will do good samples with this pattern and you will integrate this pattern to your projects

It is time to meet with IoC pattern. I will introduce Ioc with DI pattern and show you a hello world sample. What is dependency and why we are always afraid of that class dependencies? Next lecture is really good step for real world.

We need to design an architecture to manage instance before not to be late. If you have a big project than some class dependencies can be a big problem. A simple IoC container can save your time instead of changing them. Design it at first and dont face that weird problems

I will introduce you Microsoft Unity Container. At first we need to see basic usage. We already did this before in previous video

Let's use some another operations for Unity. For example parameter injection or Singleton pattern usage. 

Longest course content has just finished. I mixed content with Dependency Injection. That is the reason of having short videos in previous section. Inversion of Control will save your code life in many times and I hope you will like it. And a plus Unity is really good library for managing instances. 

You can download code files from here