如何从 Blazor 服务器端下载内存文件

Question

有没有办法下载 内存中 Blazor 服务器端[=15] 中动态生成的文件=] 无需将其存储在文件系统上？

Answer 1

解决方案是将 Web Api 控制器添加到 Blazor 服务器端应用程序中。

将 Controllers/DownloadController.cs 控制器添加到 Blazor 应用程序的根目录：

[ApiController, Route("api/[controller]")]
    public class DownloadController : ControllerBase {

        [HttpGet, Route("{name}")]
        public ActionResult Get(string name) {

            var buffer = Encoding.UTF8.GetBytes("Hello! Content is here.");
            var stream = new MemoryStream(buffer);
            //var stream = new FileStream(filename);

            var result = new FileStreamResult(stream, "text/plain");
            result.FileDownloadName = "test.txt";
            return result;
        }


    }

调整 Startup.cs Blazor 应用以支持控制器路由：

public void Configure(IApplicationBuilder app, IWebHostEnvironment env) {

            ...

            app.UseRouting();

            app.UseEndpoints(endpoints => {

                endpoints.MapControllerRoute(
                    name: "default",
                    pattern: "{controller}/{action}");

                endpoints.MapControllers();

                endpoints.MapBlazorHub();
                endpoints.MapFallbackToPage("/_Host");

            });

        }

Answer 2

像下面这样在 Blazor 中创建一个 cshtml 页面。

FileDownload.cshtml.cs:

public class FileDownloadsModel : PageModel
{        
    public async Task<IActionResult> OnGet()
    {
        byte[] fileContent = ....;                                  

        return File(fileContent, "application/force-download", "test.txt");
    }       
}

FileDownload.cshtml:

@page "/download/{object}/{id:int}/{fileType}" 
@model GFProdMan.Pages.FileDownloadsModel

仅此而已。

如何从 Blazor 服务器端下载内存文件

How to download in-memory file from Blazor server-side

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