Open File In Browser Instead Of Download ((install)) C# ◆ | TOP-RATED |

The browser decides whether to display a file or download it based on the Content-Disposition header:

: Tells the browser to attempt to render the file within the window or a new tab.

[HttpGet("view-pdf")] public IActionResult ViewPdf() { var filePath = "path/to/your/document.pdf"; var fileBytes = System.IO.File.ReadAllBytes(filePath); // Setting MIME type to application/pdf tells the browser how to render it // Providing NO third parameter (download name) defaults to inline return File(fileBytes, "application/pdf"); } Use code with caution. 2. Forcing Inline with Headers open file in browser instead of download c#

public void OpenInBrowser() { string filePath = Server.MapPath("~/Files/document.pdf"); byte[] bytes = System.IO.File.ReadAllBytes(filePath); Response.Clear(); Response.ContentType = "application/pdf"; // Crucial: Use 'inline' instead of 'attachment' Response.AddHeader("Content-Disposition", "inline; filename=document.pdf"); Response.Buffer = true; Response.BinaryWrite(bytes); Response.End(); } Use code with caution. Critical Requirements for Success Make a file open in browser instead of downloading it

To open a file in the browser instead of triggering a download in C#, the primary mechanism is controlling the sent to the client . Specifically, you must set the Content-Disposition header to inline rather than attachment . Core Concept: Inline vs. Attachment The browser decides whether to display a file

[HttpGet("stream-file")] public async Task StreamFile() { byte[] fileData = await _fileService.GetFileDataAsync(); string fileName = "report.pdf"; // Manually set the header to 'inline' Response.Headers.Add("Content-Disposition", $"inline; filename=\"{fileName}\""); return File(fileData, "application/pdf"); } Use code with caution. Implementation in ASP.NET MVC / Web API (Legacy)

: Forces the browser to prompt the user for a "Save As" download, even if the browser is capable of displaying the file type. Implementation in ASP.NET Core Forcing Inline with Headers public void OpenInBrowser() {

In modern ASP.NET Core, you can return a FileResult while explicitly defining the disposition. 1. Using the File() Helper