why using (var fileStream = new FileStream(myPath, FileMode.Create)) not working when app is deployed to Azure App Service?

Question

why using (var fileStream = new FileStream(myPath, FileMode.Create)) not working when app is deployed to Azure App Service?

maytals2001 0

I need help. I am new here I don't even know the proper way to ask

I have an app that saves documents to the wwwroot folder. Locally it works fine, but when deployed to the app service it breaks when it gets to the stament : using (var fileStream = new FileStream(myPath, FileMode.Create))

It says Exception thrown: 'System.IO.DirectoryNotFoundException' in System.Private.CoreLib.dll

Viorel 122.6K Reputation points

2024-03-11T09:32:59.45+00:00

Probably the myPath contains an inappropriate path. How did you build it?

Sometimes it has sense to load the absolute path from configuration file. Then you can use any suitable folder for myPath.
AgaveJoe 30,126 Reputation points

2024-03-11T09:58:59.6033333+00:00
My best guess is "myPath" is hardcoded. You should be using the IWebHostEnvironment service to get the wwwroot folder as illustrated in the official documentation.

https://learn.microsoft.com/en-us/aspnet/core/fundamentals/static-files?view=aspnetcore-8.0#static-file-authorization

[Authorize] public class BannerImageModel : PageModel { private readonly IWebHostEnvironment _env; public BannerImageModel(IWebHostEnvironment env) => _env = env; public PhysicalFileResult OnGet() { var filePath = Path.Combine( _env.ContentRootPath, "MyStaticFiles", "images", "red-rose.jpg"); return PhysicalFile(filePath, "image/jpeg"); } }

Uploading a file.

https://learn.microsoft.com/en-us/aspnet/core/mvc/models/file-uploads?view=aspnetcore-8.0

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Viorel 122.6K Reputation points

2024-03-11T09:32:59.45+00:00

Probably the myPath contains an inappropriate path. How did you build it?

Sometimes it has sense to load the absolute path from configuration file. Then you can use any suitable folder for myPath.
AgaveJoe 30,126 Reputation points

2024-03-11T09:58:59.6033333+00:00

My best guess is "myPath" is hardcoded. You should be using the IWebHostEnvironment service to get the wwwroot folder as illustrated in the official documentation.

https://learn.microsoft.com/en-us/aspnet/core/fundamentals/static-files?view=aspnetcore-8.0#static-file-authorization

[Authorize] public class BannerImageModel : PageModel { private readonly IWebHostEnvironment _env; public BannerImageModel(IWebHostEnvironment env) => _env = env; public PhysicalFileResult OnGet() { var filePath = Path.Combine( _env.ContentRootPath, "MyStaticFiles", "images", "red-rose.jpg"); return PhysicalFile(filePath, "image/jpeg"); } }

Uploading a file.

https://learn.microsoft.com/en-us/aspnet/core/mvc/models/file-uploads?view=aspnetcore-8.0

Answer 1

Bruce (SqlWork.com) 78,086 Volunteer Moderator

Azure app service is a webfarm. It does not make sense to write to an upload file to a local folder, as it will only be available from the physical server that uploaded it. You need to use shared storage like azure blob storage.

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why using (var fileStream = new FileStream(myPath, FileMode.Create)) not working when app is deployed to Azure App Service?

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