[英]How to download in-memory file from Blazor server-side
有沒有辦法下載在Blazor服務器端的內存中動態生成的文件,而無需將其存儲在文件系統上?
解決方案是將Web Api控制器添加到 Blazor 服務器端應用程序中。
Controllers/DownloadController.cs
控制器添加到 Blazor 應用程序的根目錄:[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;
}
}
Startup.cs
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");
});
}
在 Blazor 中創建一個 cshtml 頁面,如下所示。
文件下載.cshtml.cs:
public class FileDownloadsModel : PageModel
{
public async Task<IActionResult> OnGet()
{
byte[] fileContent = ....;
return File(fileContent, "application/force-download", "test.txt");
}
}
文件下載.cshtml:
@page "/download/{object}/{id:int}/{fileType}"
@model GFProdMan.Pages.FileDownloadsModel
就是這樣。
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