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Async and AggregateException this post is a complementary to Eran Stiller's post . I was reading Eran Stiller's post about exception handling using async methods and I want to add a few side notes. 1) the exception handling behavior decisions is well documented in this post (by the TPL team), it decided after they had consider different options. 2) I was suggesting that compiler will check whether the a catch of AggregateException is implemented and if so to avoid the unwrapping behavior...
Sela conferences (SDP) is coming near (25-29/3/2012). you can check the following link for all the SDP's tutorials and sessions http://www.sela.co.il/s/SDP2012/index.html . I will present 2 full-day tutorials (Yaniv Rodenski will join me on the first one). the first day Introduction to the Task Parallel Library is a full TPL 4 day which will give you a solid knowledge, HowTo and Consideration about building parallel application using the TPL library. at the end of this day we will...
.NET 4.5 and C# 5 is approaching to matureness I have playing with the VS 11 preview for awhile and found it very stable and exciting. now the release date is getting match closer, the beta will be released (next week) on February 29 th and it will come with “Go Live” license. as for small team and start up there is a very interesting announcement about Team Foundation Server Express Beta which is a great news and will make TFS's practice match more common than it is today. I'm certainly...
Tpl Dataflow walkthrough - Part 5 this post is a complete walkthrough of a web crawler sample that was build purely by using Tpl Dataflow . it was built on .NET 4.5 / C# 5 (on a virtual machine using VS 11 ). I will analyze each part of this sample, both by discussing the Dataflow blocks and the patterns in used. the sample code is available in here (it is a VS 11 project). during the walkthrough you will see the following Tpl Dataflow blocks: TransformBlock TransformManyBlock ActionBlock BroadcastBlock...
async / await, some reasoning this post will try to make some reasoning about the .NET 4.5 / C#5 await keyword. I will begin with a quiz. how long will it take to the following method to produce the 42 value? Code Snippet async Task < int > Execute() { await Task .Delay(1000); await Task .Delay(1000); return 42; } you should remember that conceptually the await keyword will translate to a continuation . the above code can be compare to the following TPL 4 code snippet: Code Snippet Task <...
Using async / await this post will discuss parallel disposal. whenever we want to dispose a parallel execution upon completion we can't use the convenient using keyword. for example, the following code may be dispose the command before completion: Very bad Code Snippet using ( var conn = new SqlConnection (CONN_STR)) using ( var cmd = new SqlCommand ( "Select * from Employee" , conn)) { conn.Open(); cmd.BeginExecuteReader(ar => { int affected = cmd.EndExecuteNonQuery(ar); }); } the...
async \ await and Exception Handling this post will discuss how async / await is handling exceptions . as we mention in previous post , about the async / await concept, await is all about continuation . before .NET 4.5 parallel execution exceptions has to be handle in separate of the synchronic handling. for example: handling ThreadPool execution: Code Snippet void Foo() { try { Console .WriteLine( "Synchronic" ); ThreadPool .QueueUserWorkItem(state => { try { Console .WriteLine( "Parallel"...
the concept of async \ await in this post I will survey the new .NET 4.5 / C# 5 concept of async / await. I will focus on how to understand what is really happens behind the new async / await syntax. What's it all about? the new async / await syntax is using the C# syntactic compiler to generate async operation from code that is looking very much like a synchronous code. but before we start we should discus the new C# 5 syntax. the syntax include 2 keywords: async - which is only a marker...