如何在Core Razor Pages 2.0中表示MVC Core Controller Action方法

Question

我想执行上传&从数据库下载。在MVC核心中，它工作正常，但我无法将MVC控制器的mathod转换为Razor Pages的Handler方法怎么做。如果有人帮忙，我会很高兴的。以下是关于我的应用程序的更多详细信息

MVC核心的控制器方法

[HttpPost]  
public async Task<IActionResult> UploadFile(IFormFile file)  
{  
if (file == null || file.Length == 0)  
return Content("file not selected");  

var path = Path.Combine(  
Directory.GetCurrentDirectory(), "wwwroot",   
file.GetFilename());  

using (var stream = new FileStream(path, FileMode.Create))  
{  
await file.CopyToAsync(stream);  
}  

return RedirectToAction("Files");  
}  

public async Task<IActionResult> Download(string filename)  
{  
if (filename == null)  
return Content("filename not present");  

var path = Path.Combine(  
Directory.GetCurrentDirectory(),  
"wwwroot", filename);  

var memory = new MemoryStream();  
using (var stream = new FileStream(path, FileMode.Open))  
{  
await stream.CopyToAsync(memory);  
}  
memory.Position = 0;  
return File(memory, GetContentType(path), Path.GetFileName(path));  
}

如何在Razor页面中表示上述方法

Answer 1

按照以下步骤尝试更改Razor页面：

1. 在Pages中添加FileRazor页面

2. 其内容为

   public class FileModel : PageModel
   {
   public void OnGet()
   {
   }
   [BindProperty]
   public IFormFile FormFile { get; set; }
   [IgnoreAntiforgeryToken]
   public async Task<IActionResult> OnPostUploadFileAsync()
   {
   return RedirectToPage("Index");
   }
   public async Task<IActionResult> OnGetDownloadAsync(string filename)
   {
   if (filename == null)
   return Content("filename not present");
   var path = Path.Combine(
   Directory.GetCurrentDirectory(),
   "wwwroot", filename);
   var memory = new MemoryStream();
   using (var stream = new FileStream(path, FileMode.Open))
   {
   await stream.CopyToAsync(memory);
   }
   memory.Position = 0;
   return File(memory, "application/octet-stream", Path.GetFileName(path));
   }
   }
   

3. 其视图为

   @page
   @model TestRazor.Pages.FileModel
   @{
   ViewData["Title"] = "File";
   }
   <h2>File</h2>
   <div class="row">
   <div class="col-md-4">
   <form method="post" asp-page-handler="UploadFile" enctype="multipart/form-data">
   <div class="form-group">
   <label asp-for="FormFile" class="control-label"></label>
   <input asp-for="FormFile" type="file" class="form-control" style="height:auto" />
   <span asp-validation-for="FormFile" class="text-danger"></span>
   </div>
   <input type="submit" value="Upload" class="btn btn-default" />
   </form>
   </div>
   </div>
   

4. 对OnGetDownloadAsync的请求是https://localhost:44332/file?handler=download&filename=test.txt

5. 对于上传加载文件，转到https://localhost:44332/file，然后单击上传按钮上传文件

有关Razor页面的更多信息，请参阅ASP.NET Core 中的Upload files to a Razor page