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I'm trying to use NavivgateTo in Blazor to pass a file id and name to download a file from my Download controller.

What is the proper setup? I've tried a number of possibilities and I keep seeing an error: Sorry, there is nothing at this address.

Razor Page

 public async Task SelectedDisplayDbItemChanged(DisplayDbItemsComboBoxItemDTO item) { Data = null; Data = GetDataTable(); var fileId = await utilities.ExportDataTableToFile((DataTable)Data).ConfigureAwait(false); //navigationManager.NavigateTo($"api/download/fileId/" + fileId + "/fileName/" + "myfile", true); //?data1=678&data2=c-sharpcorner navigationManager.NavigateTo($"api/Download/{fileId}/{"myfile"}", true); }

Controller:

 [HttpPost("Download/{fileId}/{fileName}")] public async Task<IActionResult> Download(string fileId, string fileName) { using (var ms = new MemoryStream()) { var fullPath = Path.Combine(DownloadPath, fileId); await using (var stream = new FileStream(fullPath, FileMode.Open)) { await stream.CopyToAsync(ms); } ms.Position = 0; return File(ms, "application/octet-stream", $"{fileName}.xlsx"); } }

I've seen a lot of examples from the Razor page to the Razor page, but not from NavigateTo to a controller with passing multiple parameters.

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I've tried these responses as well: https://stackoverflow.com/a/71130256/9594249 https://stackoverflow.com/a/71130256/9594249

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1 Answer 1

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Not like Asp.net MVC or razor page, in Blazor parameters are passed by [Parameter] tag

@page "/Download/{fileId}/{fileName}" @code { [Parameter] public string? fileId { get; set; } [Parameter] public string? fileName { get; set; } }

please refer : https://learn.microsoft.com/en-us/aspnet/core/blazor/fundamentals/routing?view=aspnetcore-6.0

(Updated)

add to Program.cs or Startup.cs:

builder.Services.AddRazorPages(options => { options.Conventions.AddPageRoute("/DownloadPage", "Download/{fileId?}/{fileName?}"); } });

Pages/DownloadPage.cshtml

@page "{fileId?}/{fileName?}" @model BlazorApp.Pages.DownloadModel

Pages/DownloadPage.cshtml.cs

using Microsoft.AspNetCore.Mvc; using Microsoft.AspNetCore.Mvc.RazorPages; namespace BlazorApp.Pages; public class DownloadModel : PageModel { private readonly IWebHostEnvironment _env; public DownloadModel(IWebHostEnvironment env) { _env = env; } public IActionResult OnGet() { // work with RouteData.Values["fileId"] and RouteData.Values["fileName"] } }

please refer :

https://learn.microsoft.com/en-us/answers/questions/243420/blazor-server-app-downlaod-files-from-server.html

https://learn.microsoft.com/ko-kr/aspnet/core/razor-pages/razor-pages-conventions?view=aspnetcore-6.0

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2 Comments

This is calling a web api controller from within Blazor. Maybe I'm doing it all wrong (new to Blazor), but I need to open up another tab to download a file. My controller to download the file works good if I add in a static file id, file name.
Ah, now I see the point now. Blazor has no controller like ASP.net MVC so it will be complicated to do so and I think you have to work with startup.cs or program.cs. I'll update my answer.

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