Posts Tagged ‘.NET’
Firebird has a feature allowing you to specify tables you want to lock (read or write and exclusive/protected/shared) when starting transaction. (Note that Firebird still uses MGA/MVCC. This is just a feature to support some scenarios.) We had constants in ADO.NET Provider for Firebird for some time, but using them resulted in wrong parameters being sent to the server and followed by exception. 
Today I implemented support for this locking (tracker item, mailing list thread). That means sending proper sequences. The FbTransactionOptions class created earlier for timeout support was extended with new property LockTables. You can use to specify table name and lock specification. The lock specification there is in fact only subset of all options you can specify for transaction (same enumeration). You can put there whatever you want other options will be simply ignored.
Small example:
conn.BeginTransaction(new FbTransactionOptions()
{
TransactionBehavior = FbTransactionBehavior.ReadCommitted, // etc.
LockTables = new Dictionary<string, FbTransactionBehavior>
{
{ "TABLE_1", FbTransactionBehavior.LockWrite | FbTransactionBehavior.Shared },
{ "TABLE_2", FbTransactionBehavior.LockWrite | FbTransactionBehavior.Exclusive }
}
});
Here I’m specifying that for TABLE_1 shared (huh ) write lock will be placed and for TABLE_2 exclusive (that sounds better, isn’t it?) write lock will be placed. Similarly you can go with LockRead.
Available right now in weekly builds and SVN.
Few days ago I posted an extension method to run projection on a collection in parallel. The method has one problem. It’s not dealing with exceptions. And because the ordering wasn’t (and isn’t) implicitly preserved, I did this small improvement.
Right now the method returns simple structure with original item, the result (if no exception occured, sure) and exception (if any). I didn’t went to AggregateException (although you can modify the code yourself to use it). Now you can decide while consuming what to do when exception occurred. Adding some kind of cancellation shouldn’t be difficult.
The idea behind is the same as in previous version.
#region ParallelProjection
internal struct ParallelProjectionResult<TSource, TResult>
{
public TSource Item { get; set; }
public TResult Result { get; set; }
public Exception Exception { get; set; }
}
internal static IEnumerable<ParallelProjectionResult<TSource, TResult>> ParallelProjection<TSource, TResult>(this IEnumerable<TSource> source, Func<TSource, TResult> projection, int maxParallelism)
{
BlockingCollection<ParallelProjectionResult<TSource, TResult>> results = new BlockingCollection<ParallelProjectionResult<TSource, TResult>>();
ThreadPool.QueueUserWorkItem((o) =>
{
Semaphore semaphore = new Semaphore(maxParallelism, maxParallelism);
CountdownEvent countdown = new CountdownEvent(1);
try
{
foreach (var item in source)
{
countdown.AddCount();
semaphore.WaitOne();
ThreadPool.QueueUserWorkItem(
(element) =>
{
TSource e = (TSource)element;
ParallelProjectionResult<TSource, TResult> result = new ParallelProjectionResult<TSource, TResult>();
result.Item = e;
try
{
result.Result = projection(e);
}
catch (Exception ex)
{
result.Exception = ex;
}
results.Add(result);
semaphore.Release();
countdown.Signal();
},
item);
}
countdown.Signal();
countdown.Wait();
results.CompleteAdding();
}
finally
{
if (countdown != null)
countdown.Dispose();
if (semaphore != null)
semaphore.Dispose();
}
}, null);
return results.GetConsumingEnumerable();
}
#endregion
Last 24 hours was interesting. Almost everybody doing something with databases and .NET was talking about new Microsoft.Data.dll. And there has been recently a lot of clarification (i.e. this or this) (check your favorite search engine for more) what it is and what it is not and who’s target audience.
From what I read emerges that it’s focused on starting developers who may not even be interested in being “real” developers. Somebody who wants to just put some site together and run. Be close to PHP world style of working. Together with WebMatrix.
I’ll not think about whether it’s good for MS’s ecosystem or not. Although I see the the points as valid, I still don’t get it. If you’re a beginner, really beginner and you wanna create some site, would you spend some time on creating it or rather try to install i.e. WordPress. It’s probably the same challenge, but the result will be different. Not taking into account, that you would still need to have at least basic knowledge of (X)HTML, programming and databases and SQL when doing it on your own, isn’t it? OK, so maybe the novice just wants to create some site on his/her own. Learn something. Improve own skills. But all this stuff isn’t going to give him/her touch of how it’s really done. You’ll be learning something that useless for bigger, real-world, applications. Umm, than he or she may not be interested in expanding skills, really just create something for fun, you might think. But do you really think this case exists? Doesn’t it sooner or later fall into one of two categories above?
And the dynamic point of view? I read somewhere that the target audience is expected to use not so sophisticated editors etc. (BTW isn’t Visual Studio Express free???). But that’s not what bothers me. What bothers me, it’s the lack of compile-time checking (which is what I damn like when I develop). You’ll upload the site to web a you’ll have to check a lot of code (pages) to see whether it works. The refactoring is harder; ahh damn, that’s not what the target audience is going to be doing or will they? Don’t forget the find&replace is refactoring as well, and here the compile time checking is really useful?
On the other hand, maybe it’s a good idea, and only because we’re not novices and the “product” isn’t enterprise ready, we should understand it and try not to judge it with enterprise-ready eyes. Because we are maybe spinning in our own world not seeing outside the box. But I personally still think the idea how it’s done it’s wrong.
The new Microsoft.Data.dll seems to be very “interesting”. 
I generally agree, that pure raw ADO.NET is more verbose than the shown example. And that’s all. On the other hand, everybody using pure raw ADO.NET have written couple of helper methods already. And directly for his/her desired approach, with non-dynamic typing. This isn’t going to make anyones life easier. As an experiment with dynamic keyword it’s nice. But a stuff used in real world deployed application? No so sure.
Wanna go easy path? Go LINQ to SQL of Entity Framework with just 1:1 model generated from database (if we’re on MS’s stack, nHibernate or LLBLGen Pro will do the work as well). Wanna go pure SQL, all under own control? ADO.NET is waiting for you. But this, this looks like kind of mixture of both, but nothing good resulted.
By the way, will there be any support for parametrized queries? I hope so. Because if not, then it’s even more funny than it already is.
UPDATE: There’s a support: http://blog.andrewnurse.net/2010/08/03/MicrosoftDataItrsquosNotAsEvilAsYouThink.aspx.
For me it’s a step back. Or am I missing something?
Here’s updated version of the method.
I have here another not-general-purpose-parallel/multihtreaded-method. To make a long story short I needed do some transformation on collection’s elements, aka projection. Unfortunately the method I was plugging in was doing some network requests, in fact couple of requests. Sequentially, blocking processing until the response came back. I know a proper way will be to turn these requests into asynchronous, unluckily this was part of bigger architecture I could not change. Because it’s not CPU bound the AsParallel method would not help much. So I solved it abusing ThreadPool threads. Bad for scheduler and memory, as I’ll be wasting threads and resources, blocking, until reply is sent by server, but very easy for me. I told you, abusing. 
So I came with this method. It’s utilizing new .NET Framework 4 concurrent collections, BlockingCollection in particular as it’s great for producer-consumer scenario and I want the method to return results whenever one is done (that also implies the ordering isn’t preserved).
internal static IEnumerable<TResult> ParallelProjection<TSource, TResult>(this IEnumerable<TSource> source, Func<TSource, TResult> projection, int maxParallelism)
{
BlockingCollection<TResult> results = new BlockingCollection<TResult>();
ThreadPool.QueueUserWorkItem((o) =>
{
Semaphore semaphore = new Semaphore(maxParallelism, maxParallelism);
CountdownEvent countdown = new CountdownEvent(1);
try
{
foreach (var item in source)
{
countdown.AddCount();
semaphore.WaitOne();
ThreadPool.QueueUserWorkItem(
(element) =>
{
results.Add(projection((TSource)element));
semaphore.Release();
countdown.Signal();
},
item);
}
countdown.Signal();
countdown.Wait();
results.CompleteAdding();
}
finally
{
if (countdown != null)
countdown.Dispose();
if (semaphore != null)
semaphore.Dispose();
}
}, null);
return results.GetConsumingEnumerable();
}
The method is straightforward, a lot of work was saved using the smart blocking collection. I’m simply reading items from the collection and applying the function to them. To not overload the system with huge number of threads I also added maxParallelism parameter. When this number of threads is processing items, I’ll stop scheduling more, using Semaphore, until some are done and again available. When there’s no item in source collection available and all item were processed I call CompleteAdding method to say I’m done and there will be no other items. Here I’m using CountdownEvent class initialized to 1 as you can’t, of course, add items if it reaches 0. Before final Wait I’m subtracting one to compensate this.
And that’s it. Again, it’s not general purpose method. Use with care, it may bring you even worse performance if wrongly used.
Often, when you discover the beauty of multithreading and parallelism, you find a need to run some operations in parallel and wait for completion. Fairly common scenario. Although now, with .NET Framework 4, you can write it using Task Parallel Library‘s Parallel.Invoke, there are scenarios when you need to plug it in into some other methods/parameters, so you’ll do it yourself explicitly with threads or better to say ThreadPool.
The method I see from time to time looks basically like this:
void DoSomethingExample()
{
int numberOfActions = 10;
ManualResetEvent[] mres = new ManualResetEvent[numberOfActions];
for (int i = 0; i < numberOfActions; i++)
{
mres[i] = new ManualResetEvent(false);
ThreadPool.QueueUserWorkItem((o) =>
{
Thread.SpinWait(20000000);
(o as ManualResetEvent).Set();
},
mres[i]);
}
ManualResetEvent.WaitAll(mres);
}
Though it’s not wrong, except the ManualResetEvents are not Disposed, it’s suboptimal. You’re wasting resources creating array of these objects.
But if you think about it, you can write it better. Better in a way for scaling, performance and memory consumption.
void DoSomethingBetter()
{
int numberOfActions = 10;
using (ManualResetEvent mre = new ManualResetEvent(false))
{
for (int i = 0; i < numberOfActions; i++)
{
ThreadPool.QueueUserWorkItem((o) =>
{
Thread.SpinWait(20000000);
if (Interlocked.Decrement(ref numberOfActions) == 0)
mre.Set();
},
null);
}
mre.WaitOne();
}
}
I’m simply using one synchronization object (and using using statement ), because I’m really interested in only when all tasks are done (one stuff), and decrementing the total number of tasks every time one finishes. Using Interlocked class I’m sure no race condition will occur and I’ll get the right results. After it reaches zero I’m signaling I’m done and the method can continue.
Fewer resources, atomic operations usage … better/faster results.
Scott Guthrie recently posted article about New Embedded Database Support with ASP.NET. This made me think about other options, Firebird in particular, and advantages and disadvantages. What I’m going to do is to very shortly introduce Firebird Embedded here and then compare it with features Scott wrote in his article.
Firebird Embedded, shortly, is Firebird database server in one DLL. No need to install etc., just load this DLL and use it. To be precise, there are some other DLLs, i.e. to support national charsets, but it’s still in under 10MB all. The database itself is built from same sources as “full” server and it’s not limited in any way.
Works with Existing Data APIs – as I said, Firebird Embedded is based on same codebase as “full” server, thus the SQL and API is same. And not only this, the ADO.NET provider for Firebird works with it and you’re programming using same thinking.
No Database Installation Required and Database Files are Stored on Disk – databases created by Firebird Embedded are stored wherever you want, with any extension. Firebird itself doesn’t have any master database, thus even the “full” server works with any (valid database) file.
Shared Web Hosting Scenarios Are Now Supported with SQL CE 4 – sure you don’t need to install anything with Firebird Embedded, that’s why it’s called Embedded. And not only this, from version 2.5, you can open database from different processes, i.e. IIS worker process and Apache workers or some console application doing something in background.
Visual Studio 2010 and Visual Web Developer 2010 Express Support – as the tool set for Firebird Embedded is exactly same as for “full” Firebird, you can use DDEX (aka Server Explorer support), Entity Framework (LINQ), …
Supports Both Development and Production – this is something I’m silently expecting. But yes, you can do the same with Firebird Embedded too.
Easy Migration to SQL Server – ahh, my favorite point. The Firebird Project has of course whopping number of tools to support migration from Embedded to “full”. The most used is … nothing. The databases are fully compatible and you can switch servers without any other tools, migration, conversion, … Just place it where you want it and connect to it, either with “full” or Embedded Firebird. And to switch your application? Again nothing. Same ADO.NET provider, just change connection string, if needed. Mostly you’ll add server IP address and maybe different path and manually switch server type, if you want. Really the migration is so simple. It is one minute task and thanks to same tool set, no matter what you version your targeting during development, your application will work with the other as well without any additional effort.
You like Firebird Embedded? I do, a lot. SQL Server Compact Edition 4 looks promising, but Firebird has something to offer as well. And recall, it’s based on same sources as “full” Firebird, very mature codebase, examined with tons of installations.
Yesterday I needed to put one element at beginning of the collection I already had. Some kind of Concat upside down. As you can use the Concat method, it looks weird when you see the code, because two items are actually swapped. So I created a simple extension method to do it for me.
I started with:
public static IEnumerable<T> Prepend<T>(this IEnumerable<T> source, T item)
{
yield return item;
foreach (var x in source)
yield return x;
}
It’s classic imperative approach, you’re expressing how you’ll do it. Then I thought: “Hey, why not to use LINQ methods already available.”. As you guess, I abused Concat method as I wrote above:
public static IEnumerable<T> Prepend<T>(this IEnumerable<T> source, T item)
{
return new[] { item }.Concat(source);
}
You can easily extend both methods to accept also collection as a second parameter.
If you’re more about declarative programming you’ll probably like the other one. But choose whatever fits your brain better.
Today I faced a behavior I have no idea exists. It’s more or less ambiguity between method with some parameters and one using params. Why more or less? Well, because it surely described in C# specification (“best match” or something similar to it). But I hadn’t know I should think about it until I was debugging weird behavior.
Let’s start with simple class:
class Test
{
public Test(params int[] foos)
{
Console.WriteLine("foos");
}
public Test(int foo, int bar)
{
Console.WriteLine("foo bar");
}
}
And now some (mind blowing ) code:
new Test(1);
new Test(1, 2);
new Test(1, 2, 3);
If you see the code in the context you probably spot the problem easily. The second row will not call the params but the other constructor.
Which is “cool” until you’re doing some refactoring and you (as I did) add new constructor with params and everything starts behaving unexpectedly. Maybe this text will help somebody to realize this faster than I did. 
Last week I was solving problem. The piece of code another code was plugged in was doing some crazy threading stuff inside while the code plugged in used some component that needed some methods (in my case just two) to be called in same thread. Well, that is to make the long story short.
As I couldn’t rely on the fact, that the thread calling the first method will be still available when the other one needs to be called I decided to simply steal one thread (in fact ThreadPool thread) for it a abuse it exclusively. To encapsulate this hack I created this class.
Before you dive into, I have to note, that it is really not a general purpose class and you shouldn’t blindly use it – you can easily use it badly and i.e. create unwanted shared state, screw the flow of your program or get wrong results due race conditions, …
/// <summary>
/// This is NOT a general purpose class.
/// Use with care.
/// </summary>
sealed class ThreadMethodRunner : IDisposable
{
AutoResetEvent _eventMethodDone;
AutoResetEvent _eventMethodIn;
Action _method;
public ThreadMethodRunner()
{
_eventMethodDone = new AutoResetEvent(false);
_eventMethodIn = new AutoResetEvent(false);
ThreadPool.QueueUserWorkItem(new WaitCallback(MethodRunnerWrapper), null);
}
private void MethodRunnerWrapper(object o)
{
for (int i = 0; i < 2; i++)
{
Debug.WriteLine("Waiting for method");
_eventMethodIn.WaitOne();
Action a = Interlocked.Exchange(ref _method, null) as Action;
a();
Debug.WriteLine("Method done");
_eventMethodDone.Set();
}
Debug.WriteLine("Thread done");
}
public void Do(Action method)
{
Interlocked.Exchange(ref _method, method);
_eventMethodIn.Set();
_eventMethodDone.WaitOne();
}
public void Dispose()
{
_eventMethodDone.Dispose();
_eventMethodIn.Dispose();
}
}
This class allows you to call the Do method with Action delegate and the method will run the code on the same thread every time (in my case just two times) called. This method blocks as you probably want to keep the behavior of you old code (at least in boundaries of method calls order, not changing some state etc. as mentioned above).
I don’t know if it’s worth any other usage than mine, but at least somebody may be inspired.
The ADO.NET provider for Firebird now fully supports all the new features in Entity Framework 4. Simple. If you’re eager to test it, grab the weekly build and enjoy.
We support the internal improvements as well as the visible changes like i.e. Model First or CreateDatabaseScript method. The template for creating SQL script is now part of sources and sure will be included in final package as well. I expect to improve it on your feedback and also the model generation from designer is pluggable so you can create custom one and use it there.
To support some new features in SQL generation I had to tweak it little bit and as with every change, there’s a change that something goes wrong. Thus I would be more than happy to get some feedback either that it works OK or any queries where it fails.
I’m so happy to cross this milestone about two months after final Visual Studio 2010, .NET Framework 4 (incl. Entity Framework 4) were released. You can expect the official release after some testing, it’s your turn .
The T4 templates are great tool for use. You can generate literally anything with it with comfort of using any .NET code you have available. Code generation (i.e. POCO classes in EFv4), web service proxies, simple DALs, …, all easily available.
But what if your scenario is one step further? You don’t want to use T4 template to generate i.e. code you’ll later compile into your application, but use the T4 template in runtime to generate result your application will later use (i.e. email based on template). Good news is you can do it, and it’s not hard either.
Easiest way is to start with Preprocessed Text Template file type adding to your solution. The file itself is ordinary T4 template you’re familiar with. But if you build your project the result produced isn’t output from template, but the C#/VB code that produces the result if called. Same result can be done by changing Custom Tool into TextTemplatingFilePreprocessor in Properties window of your current T4 template file.
Then you can create instance of this class (it has same name as your template file), setting up properties, if any and calling TransformText method. Pretty easy, isn’t it?
As it may look like nothing is going on, it’s not true. Next to Firebird 2.5 new protocol features, I’m also working on Entity Framework v4 support. Before I go further, be sure, that all providers written for Entity Framework v1 are also working with v4.
In fact right now all the major improvements in Entity Framework v4 are supported. You can benefit from features available, like the LIKE translation support or plenty of new functions. My personal favorite is TruncateTime (so I can get rid of workaround). The Model First approach is next in a row. At least basic T4 template for start is my aim. The rest could be done by you, simply modifying the template. And also wiring the template into code so you can use it programmatically too. Under the cover, while working on new stuff I’m also finding ways to optimize the code. Luckily the changes will be noticeable.
The DDEX for Firebird supports Visual Studio 2010 and the full Entity Framework v4 support will be here soon – now you can try a weekly build. Feel free to ask about anything related.
I don’t know whether it’s somewhere specifically pointed, but the ObjectContext in Entity Framework v4 has two (three) new handy methods. And I like these.
It’s kind of escape hatch similar to DefiningQuery. First method is Translate<T>. It takes DbDataReader and materializes the data back into entities. It’s similar to Materialize method from EFExtensions. If you some code in pure ADO.NET and you don’t have time or resources to redo it in EF (or it’s way easier old way) you can rewire the result into existing objects. I like it. Whenever I’ll feel I need to get dirty (and probably due to performance reasons) I can do it pretty easily.
using (testovaciEntities ent = new testovaciEntities())
{
IDbConnection conn = (ent.Connection as EntityConnection).StoreConnection;
conn.Open();
using (IDbCommand cmd = conn.CreateCommand())
{
cmd.CommandText = "select * from master";
using (DbDataReader reader = (DbDataReader)cmd.ExecuteReader())
{
MASTER[] result = ent.Translate(reader).ToArray();
Console.WriteLine(result.Length);
}
}
}
The other method is similar and simplifies the process of getting dirty if you simply need to run you fine tuned query with neat and sexy constructs. It’s ExecuteStoreQuery<T>. This method simply allows you to run any sql command directly in store language (thus you can use all features your database offers) and fetch and materialize back resulting entities. Similar to this is ExecuteStoreCommand which is similar to ExecuteNonQuery from pure ADO.NET. But you can do this without the method easily too, the method is just more convenient.
BTW also note that the Translate method isn’t adding the entities into context, it’s just about fetching and materializing.
The soon to be released Firebird 2.5 has a new ability to cancel running command (or any operation currently being processed by server) via API (in 2.1 you can do it via monitoring tables). This is a nice feature, interesting not only for database administration tools.
I was working on supporting it for a while in .NET provider, but I’m happy to say that it’s done (though I may tune the boundaries based on feedback). From some initial proposal in list I picked one following the design of SqlClient, as it’s a de facto standard in ADO.NET world.
So right now you can do:
using (FbConnection conn = new FbConnection(@"database=localhost:rrr.fdb;user=sysdba;password=masterkey"))
{
conn.Open();
//conn.DisableCancel();
//conn.EnableCancel();
using (FbCommand cmd = conn.CreateCommand())
{
cmd.CommandText =
@"execute block
as
declare cnt int;
begin
cnt = 999999999;
while (cnt > 0) do
begin
--cnt = cnt-100;
end
end";
IAsyncResult ar = cmd.BeginExecuteNonQuery(null, null);
Thread.Sleep(4000);
Console.WriteLine("Canceling");
cmd.Cancel();
try
{
object result = cmd.EndExecuteNonQuery(ar);
}
catch(FbException ex)
{
Console.WriteLine(ex.Message);
}
and you’ll get the result (even though the loop in fact never ends):
Canceling
operation was cancelled
Of course, you can screw things up by i.e. starting command and then trying to do something else with connection/transaction/command (the ADO.NET providers are not thread safe by default).
Oh, BTW, if you wanna test it, download weekly build.
I noticed is that the documentation for some of new IEnumerable<string> methods in System.IO I wrote before is missing important parts. For example, the old method has notes about unstable sorting and about the different behavior for patterns where the extension is exactly three characters long. But the new one is missing these notes and these are quite important, in my opinion. I hope this is just because we’re in RC stage and in RTM all will be ready. Else it could cause confusion when using new methods (until you find the string[] version (or this post )).
The .NET Framework 4 includes some nice new methods in System.IO namespace. There’s a lot of methods on Directory class etc. returning string[]. That’s OK until you try to enumerate directory with thousands of files (for example). Then you’re waiting for complete result even is you just need couple of first item. The new EnumerateXxx methods are solving this as these are returning IEnumerable<string> (i.e. EnumerateFiles).
I’m looking forward to use these in ID3 renamer when .NET Framework 4 will be released.
EdmGen2 is a nice tool. Especially if you know EdmGen you may find it useful. I.e. you may speed up the start of you application by pregenerating views directly from EDMX file.
Unfortunately if you try to use it with EFv4 it will crash. But we have sources, why not to fix the problem? And that’s what I did.
First problem was with new namespaces the EFv4 EDMX file has. The new ones are:
static string csdlNamespace = "http://schemas.microsoft.com/ado/2008/09/edm";
static string ssdlNamespace = "http://schemas.microsoft.com/ado/2009/02/edm/ssdl";
static string mslNamespace = "http://schemas.microsoft.com/ado/2008/09/mapping/cs";
The next step is to switch the project to target .NET Framework 4, you can do it in project options. And finally check whether the references, especially System.Data.Entity.Design, where the interesting objects are, are pointing to “4.0.0.0 versions” and correct if needed.
Done. Build and use. And if you want to have it without work, grab this file with all changes already done .
During the Friday I realized, that I did a long time nothing with my iPhone & MonoTouch development environment and I should try something more challenging. As I’m still fighting with some good idea for real world test application and my UIs are looking weird, I decided to turn my attention not to iPhone app directly, but to MonoTouch capabilities.
As a true geek I decided to try to connect to Firebird from iPhone. Although, thinking about it, I’m trying to connect to Firebird (or make it work with) with various technologies (Astoria offline, Silverlight, etc.). Because .NET provider for Firebird is pure C# and we have Mono compatible build, I deduced that it should work with iPhone too.
Sure, it’s a nice challenge to whole MonoTouch stack, because the .NET provider is more about the code than about the application itself. And we’re using there a lot of different things that can go wrong or may not be available or compilable to native code. And I have to say, the guys behind MonoTouch did a great work (I still can’t believe it).
With couple of minor tweaks I was able to create application that connects from iPhone (simulator) through internet to Firebird server. Pure C#, no hacking or major problems.
Application connecting to Firebird server and showing the server version.
First I’m impressed how mature the MonoTouch is. Second I’m still trying think thru all the possibilities you have with this. With some work on UI you can deliver the same database oriented application to Windows Mobile and iPhone using the same business layer (sure some webservice approach would be better, but …).
Looks like it’s time to stop playing and get some serious test app done.
I’m wondering whether we should start providing build of .NET provider for Firebird for MonoTouch/iPhone, as we have for Compact Framework?
13. února 2010 (sobota) se koná zajímavá konference okolo .NETích témat s podtitulem “Bringing Good Software Architecture”. Registrace je dostupná na známém místě. Program pak naleznete na knetlik.cz.
A proč je to konference zajímavá. Kromě přirozeně kvalitních témat je to jejich délka. Pouze neobvyklých 10 minut (+5 minut pro otázky). Předpoklad je, že posluchači udrží takto lépe pozornost a vstřebají více informací. A ty budou ještě vlastně hodně kondenzované, aby člověk něco smysluplného řekl a přitom se vešel do časového limitu. Těším se, až uvidím, jak to funguje (nebo taky ne).
