How Can I Implement Versatile File Downloads in ASP.NET MVC Using FileResult?

Use FileRersult to implement flexible files in ASP.NET MVC to download

In the ASP.NET MVC application, FileReSult provides an elegant file download solution. Although it is usually used to download images, its function is extended to all file types.

Determine the file type

If the file type cannot be determined in advance, the .NET Framework provides a common MIME type OCTET-Stream, which represents a common binary data stream. This type can accommodate various file formats.

Customized implementation with FileReSult

Although a custom class like BinaryContentResult can achieve the expected effect, FileRersult is a recommended method. It provides a standardized and concise solution and is widely supported by the .NET Framework. code implementation

To download any type of files with FileResult, you can use the following code fragment:

Custom file retrieval function

Getfile function is responsible for searching the binary content of files. It opens the file in the form of streaming, read the byte into the buffer, and then returns to the buffer.

<code class="language-csharp">public ActionResult Download(string filePath, string fileName)
{
    string fullName = Path.Combine(GetBaseDir(), filePath, fileName);

    byte[] fileBytes = GetFile(fullName);
    return File(fileBytes, System.Net.Mime.MediaTypeNames.Application.Octet, fileName);
}</code>

The complete code example

The complete running code (including custom Getfile function) is shown below:

Through this method, developers can seamlessly enable any file type downloads in its ASP.NET MVC application, providing a convenient and reliable mechanism for file transmission. Note that the statement is added to the code example to ensure that the file flow is closed correctly to avoid the leakage of resource.

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