Things in the .NET Framework 4 Every Programmer Should Know

Question

I recently switched to Visual Studio 2010 and updated my site to work with the .NET Framework 4. (From VS 2008 - Framework 3.5)

What do I need to know to improve site speed, readability, or memory usage?

Answer 1

• Parallel for cycles

  Parallel.For(0,10,(i)=> { // Do stuff in parallel. }); 

The rest of Parallel provides some other great things like Parallel.Invoke(...) and Parallel.ForEach(...) .

In addition, if you are doing something with Linq, you can use the ParallelEnumerable.AsParallel () method to convert your Linq queries to work in parallel.

All this is built on a parallel task library , which provides an excellent set of APIs for working with tasks in an abstract way that scales to any resources, your machine does not have to think too much about how many threads you create.

Answer 2

The DirectoryInfo class in addition to the GetDirectories and GetFiles methods now has its lazy versions of EnumerateDirectories and EnumerateFiles , which allow us to have large arrays for storing all objects at once.

Answer 3

string.Join() now has a signature that accepts IEnumerable<T> instead of just string[] - a small improvement that allows you to .Select() code .Select() and .ToArray() .

Answer 4

The amazing thing is, you can change customer IDs:

http://weblogs.asp.net/scottgu/archive/2010/03/30/cleaner-html-markup-with-asp-net-4-web-forms-client-ids-vs-2010-and-net- 4-0-series.aspx

No more CTL0001 $ _DIV0003_TextBox1001 $ or something else ...

Answer 5

I just like that the web.config file is small and meaningful, not long and full of unknown statements ...

Answer 6

Additional options are one of my favorites. The dynamic type seems promising

Answer 7

The way C # implements event fields is new. By default, it no longer makes a very bad lock (this) . However, events are still thread safe, because the Interlocked.CompareExchange(...) mechanism is used instead.

This leads to some changes that can be broken in some cases. Additional Information:

• Chris Burroughs blog: events a bit redone in C # 4, part I: Castles
• Chris Burroughs blog: events are slightly redone in C # 4, part II: semantic changes and + = / - =
• Channel 9: Whirlwind 14: What's New in C # 4 - Events

Answer 8

Enum.TryParse

Guid.TryParse

Answer 9

System.Numerics.BigInteger - An arbitrarily large signed integer.

System.Numerics.Complex - is a complex number.

Answer 10

Code contracts look very promising both in terms of creating more correct code and in terms of creating more complete documentation. Unfortunately, they are not all present in VS2010 yet - you need to install the add-in, and even then it will not be completed and will not be completed and will not work yet.

Answer 11

You can use memory mapped files (just like Windows native functions, access memory mapped files) to edit very large files and create shared memory for interprocess communication. For a detailed explanation, see: http://msdn.microsoft.com/en-us/library/dd997372.aspx

Answer 12

For ASP.NET programmers , the ASP.NET 4 and Visual Studio 2010 web development overview provides a comprehensive overview of the new ASP.NET 4. For a series of articles on the most noticeable and interesting changes, I would recommend Scott Gutierie a series of blog posts on VS 2010 and. NET 4 series .

Answer 13

ASP.net cache is now in its own assembly!

System.runtime.caching.dll

which means that you can use it in other applications such as WPF and WinForms, without having to retrieve the entire assembly of system.web

I just want them to increase the CacheItem to include inline information about the cache element, for example, when it was added ... when it expires, etc.

Answer 14

I would also like to refer to the source documentation (MSDN in this case) for a complete list of improvements and additions:

http://msdn.microsoft.com/en-us/library/ms171868.aspx

From this article, you can easily find something that can improve your existing code base.

Answer 15

For readability purposes, I will add my discovery as written in this question.

When using AJAX, you can specify the EnableCdn property of the scriptManager to load values ​​from the CDN (e.g. Microsoft CDN)

Answer 16

I believe there are also WCF improvements that fix previous troubles, such as the inability to configure WebGet / WebInvoke differently for each endpoint in .Net 3.5. I believe it is fully configurable in 4.0.