CODEWITHSUNDEEP
blazor-server-side
Lyndon Sundmark
Lyndon Sundmark

Reputation: 627

How can I find the physical path of wwwroot, in a Blazor app razor page without a controller?

i am trying to use the following code in a page in my blazor app ( blazor server app)

@inject IWebHostEnvironment WebhostEnvironment

public IWebHostEnvironment _environment { get; set; }


   var uploads = Path.Combine(_environment.WebRootPath, "uploads");
    //string uploads = @"z:\Downloads";


                path = uploads + "\\"  + file.FileInfo.Name;
                FileStream filestream = new FileStream(path, FileMode.Create, FileAccess.Write);
                file.Stream.WriteTo(filestream);
                filestream.Close();
                file.Stream.Close();

to get files to save in an uploads folder within the wwwroot folder but when I execute the code I get ' object reference not set to an instance of an object'.

Questions 1.what is causing the error? 2.Is saving uploads in wwwroot subfolder the best route to go? 3. In a network server environment could a network path simply be set in a string variable as an alternative? When I uncomment the string uploads line above the upload is successful to the designated network drive on my home network.

Thanks for whatever information can be provided...

Upvotes: 8

Views: 20765

Answers (3)

Charles Dodson
Charles Dodson

Reputation: 35

In my case (Blazor Server) I include this statement in my OnInitialized method:

rootpath = System.IO.Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "wwwroot");

rootpath is a private variable in the code block.

Then I use this approach to determine if I'm in debug mode (I work off the X: drive). The idea is, I want my code to work when I'm debugging or if the page is uploaded to the website.

    if (rootpath.Contains("X:\\"))
    {
        rootpath = rootpath.Replace("bin\\Debug\\net6.0\\", "");
    }
    
    imagefullpath = rootpath + "\\Images\\Site\\AQ16.PNG";

Hope this helps.

Upvotes: 0

Andrea Pomposelli
Andrea Pomposelli

Reputation: 51

The current solution didn't work for me as I'm using Blazor wasm. The physical pathcan be found by accessing the AppDomain or AppContext:

string rootpath = System.IO.Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "wwwroot");

To access both you can use :

var b = $"Physical location {AppDomain.CurrentDomain.BaseDirectory}";
var c = $"AppContext.BaseDir {AppContext.BaseDirectory}";

Upvotes: 5

user3442435
user3442435

Reputation:

I assume we speak about "Blazor server-side".

The physical wwwroot folder may be found by:

string rootpath = System.IO.Path.Combine(System.IO.Directory.GetCurrentDirectory(), "wwwroot");

Saving uploaded files to a sub-dir of wwwroot is sometimes not optimal, as for security reasons, this place has to be read-only. Do your users need to download back uploaded files? If not, a temp folder outside the wwwroot will be a better place.

Network path? It's possible, but your web-application should run under credentials with read-write permissions on this place. Normally, web-applications run with restricted credentials.

In conclusion: your 2 last questions must be seen regarding security concerns.

Upvotes: 9

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