Asp net core 2 0 download large file 2gb and lost internet connection during is

Introduction

ASP.NET is a popular programming language used for web applications. It provides a framework for developing dynamic websites, web services, and web APIs. In this article, we will discuss how to handle large file downloads in ASP.NET Core 2.0 and handle scenarios where the connection is lost the download process.

Downloading Large Files

When it comes to downloading large files in ASP.NET Core 2.0, it is important to consider the performance and scalability of the application. One approach is to use the FileStreamResult class, allows you to stream the file directly to the client without loading the entire file into memory.


public IActionResult DownloadLargeFile()
{
    var filePath = "path/to/large/file";
    var fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read);
    return new FileStreamResult(fileStream, "application/octet-stream");
}

In the above example, we a new instance of the FileStream class and pass the file path, file mode, file , and file share parameters. We then return a FileStreamResult with the file stream and the content type set to application/octet-stream.

Handling Lost Internet Connection

In scenarios where the internet connection is lost during the file download, it is important to handle the exception and provide feedback to the user. One way to handle this is by using the Response.OnCompleted event to check if the client is still connected sending the file.


public IActionResult DownloadLargeFile()
{
    var filePath = "path/to/large/file";
    var fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read);

    Response.OnCompleted(async () =>
    {
        if (Response.HttpContext.RequestAborted.IsCancellationRequested)
        {
            // Handle  logic here
            // e.g., log the error, notify the user, etc.
        }

        await fileStream.DisposeAsync();
    });

    return new FileStreamResult(fileStream, "application/octet-stream");
}

In the above example, we register a callback using the Response.OnCompleted event. Inside the callback function, we check if the request has been cancelled using the RequestAborted property of the HttpContext. If the request has been cancelled, we can handle the cancellation logic, such as logging the error or notifying the user. Finally, we dispose of the file stream using the DisposeAsync method.

Conclusion

In this article, we discussed how to handle large file downloads in ASP.NET Core 2.0 and handle scenarios where the internet connection is lost during the download process. By using the FileStreamResult class and the Response.OnCompleted event, we can efficiently stream large files to the client and handle interruptions gracefully. It is important to consider performance and scalability when dealing with large file downloads in ASP.NET applications.

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