如何在Asp.net CORE MVC中的浏览器上下载PDF文件

Question

我正在使用下面的代码，这些代码用于以pdf格式下载SSRS报告：

 string URL = "http://ssrs-test.com/ReportS/?/UAT_FOLDER";
 URL = URL + "&SRNo=122&rs:Command=Render&rs:Format=pdf";

 System.Net.HttpWebRequest Req = (System.Net.HttpWebRequest) System.Net.WebRequest.Create(URL);

 Req.Method = "GET";
 string path = @ "E:\New folder\Test.pdf";
 System.Net.WebResponse objResponse = Req.GetResponse();
 System.IO.FileStream fs = new System.IO.FileStream(path, System.IO.FileMode.Create);
 System.IO.Stream stream = objResponse.GetResponseStream();
 byte[] buf = new byte[1024];
 int len = stream.Read(buf, 0, 1024);

 while (len > 0) {
  fs.Write(buf, 0, len);
  len = stream.Read(buf, 0, 1024);
 }
 stream.Close();
 fs.Close();

在指定的路径E:\New folder\中完美创建一个pdf文件，我想做的是：

我需要像使用Response.Write()和Response.End()等在asp.net中一样在浏览器上下载它。

我可以在ASP.Net Core中做同样的事情吗？

我的tried：

return new PhysicalFileResult(@"with_samplepdf_file", "application/pdf");  -- Not worked

---

var stream = new FileStream(@"with_samplepdf_file", FileMode.Open);
return new FileStreamResult(stream, "application/pdf");   -- Not worked - Nothing happening on the browser

---

var file = @"with_samplepdf_file/pdf";

// Response...
System.Net.Mime.ContentDisposition cd = new System.Net.Mime.ContentDisposition
{
   FileName = file,
   Inline = displayInline  // false = prompt the user for downloading;  true = browser to try to show the file inline
};
Response.Headers.Add("Content-Disposition", cd.ToString());
Response.Headers.Add("X-Content-Type-Options", "nosniff");

return File(System.IO.File.ReadAllBytes(file), "application/pdf"); 

Answer 1

我将pdf复制到解决方案中，并将“复制到输出目录”属性更改为“复制”。

index.cshtml，它打开在浏览器标签中的pdf：

@{
    ViewData["Title"] = "Home Page";
}

<a href="/home/get">Open PDF</a>

index.cshtml，它下载到文件系统的pdf（在html锚标记上包含下载属性）：

@{
    ViewData["Title"] = "Home Page";
}

<a href="/home/get" download>Download PDF</a>

家庭控制器：

public class HomeController : Controller
{
    public IActionResult Get()
    {
        var stream = new FileStream(@"example.pdf", FileMode.Open);
        return new FileStreamResult(stream, "application/pdf");
    }
}

Answer 2

首先，您需要确保已在项目中上传了文件。

这是一个有关如何在Asp.Net Core中的浏览器上下载pdf的简单演示：

1。视图：

<a asp-action="GetPdf" asp-controller="Users">Download</a>

2.Controller（确保文件已存在于wwwroot/file文件夹中）：

 [HttpGet]
 public ActionResult GetPdf()
 {
     string filePath = "~/file/test.pdf";
     Response.Headers.Add("Content-Disposition", "inline; filename=test.pdf");
     return File(filePath, "application/pdf");           
 }

3.Startup.cs：

public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
   //...
   app.UseStaticFiles();
   //...
}

4。结果：

Answer 3

您可以下载三向文件。

public async Task<IActionResult> Get()
{
    var path = Path.Combine(
    Directory.GetCurrentDirectory(), "wwwroot\\images\\4.pdf");

    var memory = new MemoryStream();
    using (var stream = new FileStream(path, FileMode.Open))
    {
       await stream.CopyToAsync(memory);
    }
    memory.Position = 0;
    return File(memory, "application/pdf", "Demo.pdf");
}

HTML;

<form asp-controller="pdf" asp-action="Get" method="get">
  <button type="submit">Download</button>
</form>

Answer 4

您还可以使用ITextSharp或Jspdf下载pdf。