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Open file in browser instead of downloading
Open file in browser instead of downloading
Today in this article, we will simple technique of how to Open file in browser instead of downloading it directly in the .NET Core-based ASP or MVC application or API application. You may want to force files to open in the client’s browser before a client can actually download them directly. We shall see how to achieve this for the .PDF or Image file like .png or .jpeg file. Please note that ASP.NET Core now supports file download. You can let User open the file directly or download it directly without opening it in the browser. Today in this article, we will cover below aspects, Using File class to Open PDF file in browserUsing FileContentResult class to Open file in browserUsing File class to Open Image/png file in browserDifference between FileResult, FileContentResult FileStreamResultIf you are already sure about the file extension and you want the user to open the file as a preview then we can use the File or FileContentResult class to decide the behavior. Using File class to Open PDF file in browserFile class can be used directly in the controller method once you obtain the stream or byte array of the required file. [HttpGet("{id}")] [Route("Stream")] public async Task DownloadInBrowserPdfFile(string fileId) { byte [] stream = await _fileInterafces.ReadAsByteStream(fileId); string mimeType = "application/pdf"; return File(stream, mimeType); } Using FileContentResult class to Open file in browserFileContentResult class can be used directly in the controller method once you obtain the stream or byte array of the required file. [HttpGet("{id}")] [Route("Stream")] public async Task DownloadInBrowserPdfFile(string fileId) { byte [] stream = await _fileInterafces.ReadAsByteStream(fileId); string mimeType = "application/pdf"; return new FileContentResult(stream, mimeType); } Using File class to Open Image/png file in browserSimilarly depending on the file type, if you are available, you can specify file type, [HttpGet("{id}")] [Route("Stream")] public async Task DownloadInBrowserPdfFile(string fileId) { byte [] stream = await _fileInterafces.ReadAsByteStream(fileId); string mimeType = "image/png"; return new FileContentResult(stream, mimeType); }
Difference between FileResult, FileContentResult FileStreamResult
As we know FileResult is an abstract base class. Both FileContentResult & FileStreamResult classes are derived class from Abstract FileResult class. FileStreamResult – Sends binary content to the response by using a Stream instance. Here you have a stream and want to return stream content as a file. FileContentResult – Sends the contents of a binary file to the response. Here you have a byte array and want to return byte content as a file. References: Return or Download File in ASP.NET Core APIThat’s all! Happy coding! Does this help you fix your issue? Do you have any better solutions or suggestions? Please sound off your comments below. References: Python – How to check if a file existsC# Read Excel file As JSONHow to Add JSON to Git Readme markup fileReturn or Download File in ASP.NET Core APIC# Read CSV file in .NET Core -TextFieldParserPlease bookmark this page and share it with your friends. Please Subscribe to the blog to receive notifications on freshly published best practices and guidelines for software design and development. Growing by Sharing You might be interested :Split large File in Chunks using File Enumerator- Approach 3Retrieve a file from a server via SFTP-.NET C#File Error -The process cannot access the file because it is… |
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