4.5 – CSharpner.com

Below are my raw notes during the “What’s New in .Net 4.5?” session at CodeStock 2012 on Friday, June 15th at 1:50 PM / 70 min. This session was hosted by Layla Driscoll from Microsoft. She’s on the Silverlight CLR team.

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And below are my crude, raw notes taken during the session, only minimally cleaned up.

This sample will use:

Async & await

Asplnet web api

Entity framework

Creating a Metro app

Multiple tiles
Drill down into them for more stuff.
Using some sort of MVC type of development. (Really? For a DESKTOP app??!?! I’d heard of this, but that’s the LAST way I want to develop a DESKTOP app… you get the worst of both worlds… no advantages of a native app and no advantages of web deployment and all of the frustrations of both. Though, it’s cool you CAN do it… I’d just never do it that way.)
- Looks like it’s a web app, but it’s a Metro app.
- Controllers are deriving from ApiController
- Type called Feature.
- (Note, code snippet below is incomplete. Remember, I typed this in “class” as fast as I could…)
```
public class FeaturesController: ApiController
{
    private Feature[] features - {{new Feature{Id=1,Name="LINQ"}, new Feature{Id-2,Name="OptionalParam"}};
    public Ienumerable<Feature> Get()
    {
        return features;
    }

    //Feature is her own plain old class with several fields in it.
    public Feaure Get(int id)
    {
        var feature = features.SingleOrDefault(f=>f.Id=id);
        If (feature == null)
        {
            var resp = new HttpResponseMessage(HttpStatusCode.NotFound);
            Response.Content = new StringContent("Feature not found");
            throw new HttpResponseException(resp);
        }
    return feature;
    }
```

Async keyword can be placed on methods like

private async void blah()
{
    using (var httpClient = new HttpClient()
    {
        httpClient.MaxResponseContentBufferSize = 1024*1024;
        var response = await httpClient.GetStringAsync("http://localhost blah blah");
        var list = JsonConvert.DeserializeObject<List<int>>(response);
        foreach(var I int in list)
        {
            response = await httpClient.GetStringAsync("http://localhost blah blah" + i);
            var f = JsonConvert.DeserializeObject<FeatureDataItem>
        }

Use nonvolatile for locking code. (or did she say non-locking?)
Win32 API (or whatever it’s called now) looks like managed code… no DLL import crap.
New large object heap. Anything 85,000 bytes.
Multi-core JIT
Prefetcher
ReadOnlyDictionary

Tag: 4.5

CodeStock 2012: What’s New in .Net 4.5?