internal server error 500 and file not downloaded although file creating on server ?

Question

i work on application web api core 2.2 working with ui angular
i design page download file
file i need to download is create but can't download
although i not get any exception error

error i get
ERROR HttpErrorResponse {headers: HttpHeaders, status: 500, statusText: 'Internal Server Error', url: 'http://localhost:61265/api/Z2Delivery/ExportNormalizedRelation/', ok: false, …}

what i try as below

on web api
[HttpPost, DisableRequestSizeLimit]
[Route("ExportNormalizedRelation")]
public IActionResult ExportNormalizedRelation()
{
return File(zipPath, "text/plain", Path.GetFileName(zipPath));

        }  

error display as below

fail: Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware[1]  
      An unhandled exception has occurred while executing the request.  
System.InvalidOperationException: No file provider has been configured to process the supplied file.  
   at Microsoft.AspNetCore.Mvc.Infrastructure.VirtualFileResultExecutor.GetFileInformation(VirtualFileResult result)  
   at Microsoft.AspNetCore.Mvc.Infrastructure.VirtualFileResultExecutor.ExecuteAsync(ActionContext context, VirtualFileResult result)  
   at Microsoft.AspNetCore.Mvc.VirtualFileResult.ExecuteResultAsync(ActionContext context)  
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeResultAsync(IActionResult result)  
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeNextResultFilterAsync[TFilter,TFilterAsync]()  
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Rethrow(ResultExecutedContext context)  
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.ResultNext[TFilter,TFilterAsync](State& next, Scope& scope, Object& state, Boolean& isCompleted)  
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeResultFilters()  
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeNextResourceFilter()  
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Rethrow(ResourceExecutedContext context)  
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)  
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeFilterPipelineAsync()  
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeAsync()  
   at Microsoft.AspNetCore.Builder.RouterMiddleware.Invoke(HttpContext httpContext)  
   at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)  
   at Microsoft.AspNetCore.Cors.Infrastructure.CorsMiddleware.InvokeCore(HttpContext context)  
   at Microsoft.AspNetCore.Cors.Infrastructure.CorsMiddleware.InvokeCore(HttpContext context)  
   at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)  
warn: Microsoft.AspNetCore.Cors.Infrastructure.CorsService[11]  
      The CORS protocol does not allow specifying a wildcard (any) origin and credentials at the same time. Configure the policy by listing individual origins if credentials needs to be supported.  
warn: Microsoft.AspNetCore.Cors.Infrastructure.CorsService[11]  
      The CORS protocol does not allow specifying a wildcard (any) origin and credentials at the same time. Configure the policy by listing individual origins if credentials needs to be supported.  
fail: Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware[1]  
      An unhandled exception has occurred while executing the request.  
System.InvalidOperationException: No file provider has been configured to process the supplied file.  
   at Microsoft.AspNetCore.Mvc.Infrastructure.VirtualFileResultExecutor.GetFileInformation(VirtualFileResult result)  
   at Microsoft.AspNetCore.Mvc.Infrastructure.VirtualFileResultExecutor.ExecuteAsync(ActionContext context, VirtualFileResult result)  
   at Microsoft.AspNetCore.Mvc.VirtualFileResult.ExecuteResultAsync(ActionContext context)  
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeResultAsync(IActionResult result)  
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeNextResultFilterAsync[TFilter,TFilterAsync]()  
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Rethrow(ResultExecutedContext context)  
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.ResultNext[TFilter,TFilterAsync](State& next, Scope& scope, Object& state, Boolean& isCompleted)  
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeResultFilters()  
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeNextResourceFilter()  
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Rethrow(ResourceExecutedContext context)  
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)  
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeFilterPipelineAsync()  
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeAsync()  
   at Microsoft.AspNetCore.Builder.RouterMiddleware.Invoke(HttpContext httpContext)  
   at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)  
   at Microsoft.AspNetCore.Cors.Infrastructure.CorsMiddleware.InvokeCore(HttpContext context)  
   at Microsoft.AspNetCore.Cors.Infrastructure.CorsMiddleware.InvokeCore(HttpContext context)  
   at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)  

so please how to solve issue please ?

Answer 1

Hi. @ahmed salah

Please refer to the following SO article and try using PhysicalFileProvider.
https://stackoverflow.com/questions/53631178/invalidoperationexception-on-file-return

Answer 2

Change the code to...

return File(System.IO.File.OpenRead(zipPath), "application/zip", Path.GetFileName(zipPath));

This assumes you are downloading a zip file. Otherwise, if you are downloading a text file then text/plain is fine or use application/octet-stream if the file type is unknown.

Answer 3

Hi @ahmed salah ,

Agree with AgaveJoe, to download the zip file, first we need to read the file into the FileStream or a byte array, return a FileContentResult to download the file.

So you can use the following code:

 return File(System.IO.File.OpenRead(zipPath), "application/zip", Path.GetFileName(zipPath));  

Or

return File(System.IO.File.ReadAllBytes(zipPath), "application/zip", Path.GetFileName(zipPath));  

The difference between OpenRead and ReadAllBytes is that, OpenRead will read the file to FileStream and the ReadAllBytes will read the file to a byte array.

---

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Best regards,
Dillion

Answer 4

Where did you put the file you want to download? If you use the File method the file must be under wwwroot and the 1st argument of the File method must be virtual path.

For example, if you put the test.pdf under wwwroot/files the code will be as follows:

public IActionResult DownloadFile()  
{  
  string virtualPath = "/files/test.pdf";   
  return File(virtualPath, "application/pdf", "test.pdf");  
}  

If you put the file somewhere outside wwwroot and want to set the physical path use the PhysicalFileResult class:

PhysicalFileResult Class
https://learn.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.mvc.physicalfileresult?view=aspnetcore-6.0