About code. Mostly on C++
After the MVP Summit in Seattle, I started to dig into the Parallel FX framework (currently under a CTP available here). In just a few words, the framework is composed of: Task Parallel Library (TPL), that provides means to manage task (i.e. units of execution), and exposes a TPL API, represented by the static function … Read more
There are two way of converting strings to numerical values in .NET. The first one, supported since the first version of the platform, is the use of System.Convert class. It has methods like ToInt32, ToChar, ToDouble, ToDataTime, ToDecimal, etc. Here is an example of converting string “123” to numerical value 123. string text = “123”; … Read more
Suppose you need a ListBox that has to display items with the text spread across multiple lines. With the default implementation that would look like this: The CR LF characters are displayed as squares and the item has only one line of text. To make the list box items have variable height depending on the … Read more
When I delivered the LINQ presentation at the RONUA meeting in April, I was asked how does LINQ perform on big data sets. To answer that I decided to test LINQ to XML against a 100+MB file. I decided to extract three different sets of data from this XML file: 1 set representing about 0.5MB … Read more
LINQ to SQL is an API that allows querying relational databases. The samples in this post are based on the concepts of: Entity classes (which are instances of Entity Types). Such a class is a regular .NET class that is decorated with the attribute Table and its properties and fields with the attribute Column DataContext, … Read more
On Saturday, April 22, I delivered a presentation on LINQ at a meeting of the RONUA community in Timisoara. The presentation was focused on sample codes for LINQ to Objects, LINQ to XML and LINQ to SQL. Today I uploaded on the site the presentation and demo programs so that you can download them. Here … Read more
LINQ offers an API called LINQ to XML, formally known as XLinq, that provides support for working with XML. This API resides in the System.Xml.Linq namespace, and you need to add a reference to the assembly with the same name to be able to use it. If you installed the Orcas March CTP bits, the … Read more
yield is a new contextual keyword introduced to C# 2.0, vital for lazy evaluation and the performance of queries in LINQ. Being a contextual keyword means that yield can be used as a variable name in C# without any problem. When put before return it becomes a keyword. yield allows one enumerable class to be … Read more
In my last post about LINQ I shown you an example about how to use the language integrated query to select information about directories. In this post I’ll get more into the syntax and show you something about the functional querying style. My examples will focus on displaying information about UEFA Champions Leage winners. Thus, … Read more
LINQ is a valuable feature for database and XML programming, but not only. Basically, you can use LINQ with everything that returns an IEnumerable. Here is an example, when I want to list the directories of a parent directory, in alfabetical order, and grouped by the file attributes (first all that have only the flag … Read more