By Sébastien Finot
question databases interactively utilizing LINQ and LINQPad
- Leverage the facility of LINQPad to profit LINQ
- Discover LINQPad’s key good points and options
- Learn concerning the cool purposes of LINQPad akin to trying out, code snippet iteration, and so on
If you want to engage with databases, XML, in-memory collections, or distant prone, LINQ could make your lifestyles easier. how one can observe LINQ is with assistance from LINQPad, a unfastened IDE whose first target is to ensure that writing and interacting along with your LINQ question is enjoyable and simple. extra mostly, LINQPad is a C#/VB/F# scratchpad that immediately executes any expression, assertion block, or application with wealthy output formatting and a wealth of features.
With construction Interactive Queries with LINQPad, you are going to speedy study every thing you want to recognize to begin utilizing LINQ. To speed up your studying curve, you'll find the way to use LINQPad and its positive aspects to check your queries interactively and test with the entire ideas provided by way of LINQ.
In all chance, C#, yet have you ever had an opportunity to attempt out LINQ? development Interactive Queries with LINQPad will introduce you to every little thing LINQ can provide and may allow you to engage with each instance in LINQPad, LINQ’s top companion.
You will construct and test with interactive queries with this useful advisor illustrated with brief and designated code samples. additionally, you will get accustomed to different cool purposes of LINQpad corresponding to checking out, code snippet new release, and so forth, in addition to a huge method of LINQ (to item, to SQL, to XML, and so on).
What you are going to study from this book
- Discover what LINQ can do and the way it is going to support you
- Learn all approximately LINQ question operators to hitch, mixture, decide upon, and clear out data
- Write LINQ queries with either process and question syntaxes
- Query databases and distant providers utilizing LINQ
- Create and control XML and in-memory collections
- Differentiate LINQPad’s question types
- Handle person enter with LINQPad
- Customize LINQPad to suit your style or workflow
A step by step functional advisor that might introduce you to LINQPad’s key positive factors, thereby supporting you to question databases interactively.
Who this publication is written for
This booklet is geared toward C#/.Net builders who desire to research LINQ programming and leverage the straightforward means of utilizing LINQPad. No earlier wisdom of LINQ or LINQPad is anticipated. A easy wisdom of SQL and XML is needed for a few chapters.
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Extra info for Building Interactive Queries with LINQPad
The standard version We are going to implement a simple scenario: given a deck of 52 cards, we want to pick a random number of cards, and then take out all of the hearts. From this stack of hearts, we will discard the first two and take the next five cards (if possible), and order them by their face value for display. Resize(ref hearts, j); // check that we have at least 2 cards. FaceValue); } } [ 32 ] Chapter 3 Even if we didn't consider the CreateDeck() method, we had to do quite a few operations to produce the expected result (your values might be different as we are using random cards).
From now on (wherever possible) we'll provide the samples for both the syntaxes. [ 38 ] Chapter 3 Summary In this chapter you learned what LINQ is, what its benefits are, what a query looks like, and the two different syntaxes of LINQ. In the next chapter we are going to write your first LINQ query, and discover query operators that will let you manipulate data. [ 39 ] Discovering LINQ Query Operators In this chapter we will introduce you to the most common query operators, and see a bit more of LINQ to objects.
We will see anonymous types in Chapter 5, Databases and Relational Data. For the rest of this book, and unless the type of the variable needs to be explicitly written (for pedagogical reasons for example), I will prefer var. Feel free to experiment without var if you don't feel comfortable or prefer explicit notation. The OfType() query operator OfType() will filter your collection based on the type you provide. This can prove extremely useful when you're dealing with a base type object collection and need to extract a specific subtype (or if you are dealing with untyped collections).