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Showing content from http://cefsharp.github.io/api/75.1.x/html/M_CefSharp_IJsDialogHandler_OnBeforeUnloadDialog.htm below:

Called to run a dialog asking the user if they want to leave a page. Return false to use the default dialog implementation. Return true if the application will use a custom dialog or if the callback has been executed immediately. Custom dialogs may be either modal or modeless. If a custom dialog is used the application must execute callback once the custom dialog is dismissed.

CefSharp (in CefSharp.dll) Version: 75.1.140.0 (75.1.140.0)

bool OnBeforeUnloadDialog(
	IWebBrowser chromiumWebBrowser,
	IBrowser browser,
	string messageText,
	bool isReload,
	IJsDialogCallback callback
)

bool OnBeforeUnloadDialog(
	IWebBrowser^ chromiumWebBrowser, 
	IBrowser^ browser, 
	String^ messageText, 
	bool isReload, 
	IJsDialogCallback^ callback
)

chromiumWebBrowser

Type: CefSharpIWebBrowser
the ChromiumWebBrowser control

browser

Type: CefSharpIBrowser
the browser object

messageText

Type: SystemString
message text (optional)

isReload

Type: SystemBoolean
indicates a page reload

callback

Type: CefSharpIJsDialogCallback
Callback can be executed inline or in an async fashion

Type:

Return false to use the default dialog implementation otherwise return true to handle with your own custom implementation.

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