Create a file in dotnet core

Question

I am currently in the process of updating my companies applications to dotnet 5. One issue I have come up against in several applications is being able to create/generate a file.

The code below is how it was done in dotnet framework.

string output = "a very long string";

Response.Clear();
Response.ClearHeaders();
Response.AddHeader("Content-Length", output.Length.ToString());
Response.ContentType = "text/plain";
Response.AppendHeader("Content-Disposition", "attachment;filename=test.txt");
Response.Write(output);
Response.End();

I have looked around and I cannot find its equivalent in dotnet core.

where to you write a file in the code provided? It looks more like an http-request to me — Kraego, Sep 28 '21 at 14:08
I think this answer can help you: https://stackoverflow.com/a/45728209/357561 — Roberto Conte Rosito, Sep 28 '21 at 14:11
Is this your answer? https://stackoverflow.com/questions/38897764/asp-net-core-content-disposition-attachment-inline — sa-es-ir, Sep 28 '21 at 14:56

Kraego · Accepted Answer · 2021-09-28T15:16:22.267

1

If you have to return a file in request (assuming you're talking about ASP.NET Core), you'll do:

public IActionResult ReturnAFile()
{
    ...
    // filestream in your question: stream on output
    return File(filestream, "content/type", "output.txt");
}

Maybe this SO Answer can give you some hints.

edited Sep 28 '21 at 15:16

answered Sep 28 '21 at 14:07

Kraego

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While that's true, it doesn't do anything like what the OP described as "create a file" in the question. The code basically shows attaching a file in an HTTP response, so I expect the OP wants to know how to do that in ASP.NET Core. – Jon Skeet Sep 28 '21 at 14:27
Thanks for the input, never thought that I really ever would communicate with The Jon Skeet ... – Kraego Sep 28 '21 at 15:12

Create a file in dotnet core

1 Answers1