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What is a Design Pattern?

Posted By :Gowthammanju     Posted Date :July 31, 2011    Points :40   Category :.NET Framework 
Design Pattern is a re-usable, high quality solution to a given requirement, task or recurring problem. Further, it does not comprise of a complete solution that may be instantly converted to a code component, rather it provides a framework for how to solve a problem.

You can also find related Interview Question to What is a Design Pattern?  below: 

Which design pattern should have private or protected constructor?

  
singleton design pattern should have private or protected constructor (More...)

You are designing a single person shooter game application. The player can choose between multiple guns.
1) Pistol with 5 bullets
2) Shotgun with 100 bullets
3) Grenade Launcher with 20 grenades

Each gun will have different sound effects and graphics.

Pressing Ctrl+Space should rotate between guns.
Which design pattern should you employ for this?

  
Use Strategy Pattern.

Explanation: Each gun having different performance and graphics.
So this can be accomodated in the algorithm.

Strategy pattern is best suited for shifting the guns/algorithms

There will be a IGun interface implemented by 3 classes
Pistol : IGun
Shotgun : IGun
GrenadeLauncher : IGun (More...)

What is design pattern?

  
Design pattern are recurring solution to the recurring problem.

There are basically classified in to three categories. They are,
1. Creational pattern
2. Structural pattern
3. Behavioural pattern.
(More...)

Which design pattern to use if i needed to add additional responsibilities at runtime?

  
Decorator Pattern design pattern is use if i needed to add additional responsibilities at runtime (More...)

Which is the design pattern that is type-safe and still extensible on runtime?

  
Decorator Pattern design pattern that is type-safe and still extensible on runtime (More...)

What is the Prototype Design Pattern?

  
A prototype design pattern relies on creation of clones rather than objects. Here, we avoid using the keyword 'new' to prevent overheads. (More...)

What is the Lazy Design Pattern?

  
The approach of the Lazy Design Pattern is not to create objects until a specific requirement matches, and when it matches, object creation is triggered. (More...)

What are the wildcards used for pattern matching?

  
"_" for single character substitution and "%" for multi-character substitution (More...)

How to decide on the design consideration to take a Datagrid, datalist or repeater ?

  
Many make a blind choice of choosing datagrid directly, but that's not the right way.

Datagrid provides ability to allow the end-user to sort, page, and edit its data. But it comes at a cost of speed. Second the display format is simple that is in row and columns. Real life scenarios can be more demanding that

With its templates, the DataList provides more control over the look and feel of the displayed data than the DataGrid.

It offers better performance than datagrid Repeater control allows for complete and total control. With the Repeater, the only HTML emitted are the values of the databinding statements in the templates along with the HTML markup specified in the templates-no "extra" HTML is emitted, as with the DataGrid and DataList. By requiring the developer to specify the complete generated HTML markup, the Repeater often requires the longest development time. But repeater does not provide editing features like datagrid so everything has to be coded by programmer. However, the Repeater does boast the best performance of the three data Web controls. Repeater is fastest followed by Datalist and finally datagrid. (More...)

What operator performs in pattern matching in SQL Server

  
LIKE operator is used in pattern matching in SQL Server (More...)

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