julazor：如何将多个参数从navigateto传递到Web API控制器以下载文件

Question

我正在尝试在Flazor中使用 Navivgateto 传递文件ID和名称以从我的下载控制器下载文件。

什么是正确的设置？我已经尝试了许多可能性，但我一直看到一个错误：对不起，此地址没有什么。

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");
            }
        }

我已经看到了很多从剃刀页到剃须刀页面的示例，但不是从 navigateto 到传递多个参数的控制器。

我也尝试了这些响应： https://stackover.com/a/a/a/71130256/9594249 https://stackoverflow.com/a/a/71130256/9594249

Answer 1

不像ASP.NET MVC或Razor Page，在[参数]标签中传递了Blazor参数，

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

请参考： https://learn.microsoft.com/en-us/aspnet/aspnet/core/core/blazor/fundamentals/routing?view?view = = appnetcore-6.0

---

）

添加到program.cs或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"]
        }
    }

请参阅：

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/razor-pages-conventions?view= aspnetcore-6.0