Cefsharp Cancel [better] Download May 2026

The most efficient way to block a download is at the CanDownload stage. This method is called in response to user actions like clicking a link that returns a Content-Disposition: attachment header.

Once a download is deemed "allowable" by CanDownload , the OnBeforeDownload method is triggered. This is where you typically specify the file path or show a "Save As" dialog. CefSharp/CefSharp/Handler/IDownloadHandler.cs at master cefsharp cancel download

public bool CanDownload(IWebBrowser chromiumWebBrowser, IBrowser browser, string url, string requestMethod) { // Check if the URL is from a restricted domain if (url.Contains("untrusted-source.com")) { return false; // Cancels the download immediately } return true; // Proceed to OnBeforeDownload } Use code with caution. The most efficient way to block a download

Return false to immediately terminate the request before any data is transferred. This is where you typically specify the file

Blocking downloads based on the URL or request method (GET/POST).

In CefSharp, controlling file downloads is a critical task for developers who need to restrict certain file types, manage user permissions, or build custom download managers. To , you primarily interact with the IDownloadHandler interface at three different stages: before it starts, during the initialization, or while it is in progress. Method 1: Prevent Downloads Before They Start (CanDownload)