Here is an example of how to write a log entry to a file using C# in server-side:
//Code sample
public class Logout : ComponentBase
{
[Inject]
private ILogger<Logout> logger { get; set; }
protected override void OnInitialized()
{
base.OnInitialized();
JSRuntime.InvokeVoidAsync("registerUnloadEvent", DotNetObjectReference.Create(this));
}
[JSInvokable]
public void LogOut()
{
string loginId = HttpContext.Session.GetString("LoginId");
string logMessage = "Login id logs out " + loginId + " at " + DateTime.Now.ToString();
logger.LogInformation(logMessage);
}
}
his code writes a log entry to the server’s log using the ILogger
interface. The log entry contains the login ID of the user and the timestamp of when they logged out.
To trigger this method when the user closes the browser tab, you can use the onbeforeunload
event in JavaScript. This event is triggered when the user navigates away from the page, closes the browser, or closes the tab. You can use this event to make an AJAX call to the server and invoke the LogOut()
method.
Please note that this is just one way to achieve this functionality. There are other ways to write a log entry to a file or database, depending on your specific requirements and architecture.