FileContentResult

FileContentResult is a class in the ASP.NET Core framework, specifically within the Microsoft.AspNetCore.Mvc namespace. It is used to represent the result of an HTTP request that returns file content. This class is derived from the ActionResult class, which is the base class for all action results in ASP.NET Core.

The primary purpose of FileContentResult is to send a file to the client as part of the HTTP response. This can be useful in scenarios where you need to download a file, such as generating and sending a PDF, an image, or any other type of file. The class takes the file content as a byte array and the content type as parameters.

When using FileContentResult, you can also specify additional properties such as the file name, which can be useful for the client to save the file with an appropriate name. This is done using the FileDownloadName property.

Here is a simple example of how to use FileContentResult in an ASP.NET Core controller:

```csharp

public IActionResult DownloadFile()

{

byte[] fileBytes = System.IO.File.ReadAllBytes("path/to/your/file.txt");

string contentType = "application/octet-stream";

string fileName = "file.txt";

return File(fileBytes, contentType, fileName);

}

```

In this example, the DownloadFile method reads a file from the server, sets the content type and file name, and then returns a FileContentResult to send the file to the client. This approach ensures that the file is properly handled and sent as part of the HTTP response.