Skip to main content

C# Learning: LINQ Concept

LINQ means Language-INtegrated Query.


Before LINQ, we had to juggle different languages like SQL, XML, or XPath
along with various technologies and APIs like ADO.NET or System.Xml in every
application written using general-purpose languages such as C# or VB.NET. It goes
without saying that this approach had several drawbacks.1 LINQ glues several
worlds together. It helps us avoid the bumps we would usually find on the road
from one world to another: using XML with objects, objects with relational data,
and relational data with XML are some of the tasks that LINQ will simplify.
One of the key aspects of LINQ is that it was designed to be used against any
type of object or data source and to provide a consistent programming model for
doing so.

The syntax and concepts are the same across all of its uses: Once you
learn how to use LINQ against an array or a collection, you also know most of the
concepts needed to take advantage of LINQ with a database or an XML file.
Another important aspect of LINQ is that when you use it, you work in a
strongly typed world. The benefits include compile-time checking for your queries
as well as nice hints from Visual Studio’s IntelliSense feature.
LINQ will significantly change some aspects of how you handle and manipulate
data with your applications and components. You will discover how LINQ is a step
toward a more declarative programming model. Maybe you will wonder in the
not-so-distant future why you used to write so many lines of code.
There is duality in LINQ. You can conceive of LINQ as consisting of two complementary
parts: a set of tools that work with data, and a set of programming language
extensions.

Comments

Post a Comment

Popular posts from this blog

Stretch a row if data overflows in jasper reports

It is very common that some columns of the report need to stretch to show all the content in that column. But  if you just specify the property " stretch with overflow' to that column(we called text field in jasper report world) , it will just stretch that column and won't change other columns, so the row could be ridiculous. Haven't find the solution from internet yet. So I just review the properties in iReport one by one and find two useful properties(the bold  highlighted in example below) which resolve the problems.   example: <band height="20" splitType="Stretch" > <textField isStretchWithOverflow="true" pa...
4 comments
Read more

Live - solving the jasper report out of memory and high cpu usage problems

I still can not find the solution. So I summary all the things and tell my boss about it. If any one knows the solution, please let me know. Symptom: 1.        The JVM became Out of memory when creating big consumption report 2.        Those JRTemplateElement-instances is still there occupied even if I logged out the system Reason:         1. There is a large number of JRTemplateElement-instances cached in the memory 2.     The clearobjects() method in ReportThread class has not been triggered when logging out Action I tried:      About the Virtualizer: 1.     Replacing the JRSwapFileVirtualizer with JRFileVirtualizer 2.     Not use any FileVirtualizer for c...
1 comment
Read more

JasperReports - Configuration Reference

Data Source / Query Executer net.sf.jasperreports.csv.column.names.{arbitrary_name} net.sf.jasperreports.csv.date.pattern net.sf.jasperreports.csv.encoding net.sf.jasperreports.csv.field.delimiter net.sf.jasperreports.csv.locale.code net.sf.jasperreports.csv.number.pattern net.sf.jasperreports.csv.record.delimiter net.sf.jasperreports.csv.source net.sf.jasperreports.csv.timezone.id net.sf.jasperreports.ejbql.query.hint.{hint} net.sf.jasperreports.ejbql.query.page.size net.sf.jasperreports.hql.clear.cache net.sf.jasperreports.hql.field.mapping.descriptions net.sf.jasperreports.hql.query.list.page.size net.sf.jasperreports.hql.query.run.type net.sf.jasperreports.jdbc.concurrency net.sf.jasperreports.jdbc.fetch.size net.sf.jasperreports.jdbc.holdability net.sf.jasperreports.jdbc.max.field.size net.sf.jasperreports.jdbc.result.set.type net.sf.jasperreports.query.chunk.token.separators net.sf.jasperreports.query.executer.factory.{language} net.sf.jasperreports.xpath....
Post a Comment
Read more