Using files with your ASP.Net project

Question

I am pretty new to ASP.Net and I am tying to access a couple JSON files in my directory. In my normal Visual Studio projects I could store these files in /bin/debug, where do i store these files here? I heard you have "App_Data" but i don't understand how i would configure this.

I tried:

string JsonString = File.ReadAllText("~/App_Data/" + filename); (stored file under self created App_Data map in Project/Project/)
string JsonString = File.ReadAllText(filename);

error: (I do realise it says where i should store it but isn't there a better way to store these files in my project directoy?)

App_Data is just a folder, there's no need to "configure" it. However, you do need to use MapPath to convert ~/App_Data to a real physical path. — DavidG
– DavidG, Commented Feb 27, 2017 at 10:37
I normally embed the files as resources - see stackoverflow.com/questions/3314140/… and support.microsoft.com/en-gb/help/319292/… — phooey
– phooey, Commented Feb 27, 2017 at 10:38
var path = string.Concat(HostingEnvironment.MapPath(@"~\bin\"), filename); var json = File.ReadAllText(path); — Leszek P
– Leszek P, Commented Feb 27, 2017 at 10:39
@phooey The downside of that is that it makes the resource fixed which is not useful if you need to edit the file. — DavidG
– DavidG, Commented Feb 27, 2017 at 10:39

Maximilian K. · Accepted Answer · 2017-02-27 10:51:40Z

1

In .Net Core I'm using the IHostingEnvironment to get the Root Path of my Application. Then you can do somethink like Path.Combine(_hostingEnvironment.ContentRootPath, "myfolder", filename) to get the path of the file. Then you can use File.ReadAllText with that path.

To get the IHostingEnvironment you have to add it as an Parameter in the constructor:

private readonly IHostingEnvironment _hostingEnvironment;

public MyController(IHostingEnvironment hostingEnvironment)
{
    _hostingEnvironment = hostingEnvironment;
}

edited Feb 27, 2017 at 10:51

answered Feb 27, 2017 at 10:42

Maximilian K.

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2 Comments

DavidG Over a year ago

This is for .Net Core isn't it?

Maximilian K. Over a year ago

Oh. Right. Sorry. I'm forgetting all the time, that .Net and .Net Core are not as compatible as I thought :D

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