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ASP.NET MVC - Attaching an entity of type 'MODELNAME' failed because another entity of the same type
In a nutshell the exception is thrown during POSTing wrapper model and changing the state of one entry to 'Modified'. Before changing the state, the state is set to 'Detached' but calling Attach() does throw the same error. I'm using EF6.
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Understanding garbage collection in .NET
...top the GC from being to over-eager with collecting a reference, that can happen in interop scenarios where a reference is passed to unmanaged code. The garbage collector cannot see such references being used by such code since it wasn't compiled by the jitter so doesn't have the table that says wh...
Allow user to select camera or gallery for image
...ngle Intent to select images from either the Gallery or the Camera, or any application registered to browse the filesystem.
Rather than creating a Dialog with a list of Intent options, it is much better to use Intent.createChooser in order to get access to the graphical icons and short names of the...
What is aspect-oriented programming?
...sic examples are security and logging. Instead of writing code within your application to log occurance of x or check object z for security access control there is a language contraption "out of band" of normal code which can systematically inject security or logging into routines that don't nativly...
Swift compiler error: “non-modular header inside framework module”
...jority of people running into this issues is caused after they switch from Application Target to Framework Target and start adding C and Objective C headers into framework's umbrella header expecting it to have a same behaviour as application's Bridging Header, which behaves differently. The umbrell...
NSDate get year/month/day
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Because this is apparently my most popular answer, I'll try to edit it to contain a little bit more information.
Despite its name, NSDate in and of itself simply marks a point in machine time, not a date. There's no correlation between the ...
Can an ASP.NET MVC controller return an Image?
...File method.
public ActionResult Image(string id)
{
var dir = Server.MapPath("/Images");
var path = Path.Combine(dir, id + ".jpg"); //validate the path for security or use other means to generate the path.
return base.File(path, "image/jpeg");
}
As a note, this seems to be fairly effi...
Upgrading PHP in XAMPP for Windows?
... I could install the newest version of XAMPP at C:\XAMPP but still have my app's data and original version in case something went. I was scared after I installed the newest XAMPP and saw that it "overwrote" my XAMPP ORIG - on my C: drive, there was only C:\XAMPP - but relieved when my htdocs and my...
Lock Android phone application to Portrait mode
Can someone tell me how to lock my application to a portrait mode? Is it a simple configuration in the manifest file?
4 Ans...
Delete multiple objects in django
... own, combine ModelForms and generic views. Otherwise, look into 3rd party apps that provide similar functionality. In a related question, the recommendation was django-filter.
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