How do I check whether there is an ongoing session I .NET 7.0? - asp.net

Question

I am trying to check whether there is an ongoing session. To achieve this:
I set the "Id" to the relevant person's ID using:
HttpContext.Session.SetString("Id", user.Id.ToString())
I tried using the following code block to check whether there is an ongoing session:
if ( String.IsNullOrEmpty(HttpContext.Session.GetString("Id")))){
codes if condition is true.
}
However, the code block keeps executing regardless the session "Id" has been set or not. How do I fix this ?
I am using .NET 7 on a windows platform.

Answer 1

You can use the Session property of the HttpContext class in .NET 7.0 to check whether there is an ongoing session. You can store the session identifier in a variable when the session starts and check if the variable is set in subsequent requests to determine if the session is ongoing.
Here is an example:
// Setting the session identifier when the session starts
if (HttpContext.Session.GetInt32("SessionId") == null)
{
HttpContext.Session.SetInt32("SessionId", new Random().Next());
}
// Checking if the session is ongoing in subsequent requests
if (HttpContext.Session.GetInt32("SessionId") != null)
{
// code to execute if the session is ongoing
}
else
{
// code to execute if the session is not ongoing
}
and you can modify your code as follows to fix the issue:
if (!HttpContext.Session.TryGetValue("Id", out byte[] value) ||
String.IsNullOrEmpty(Encoding.UTF8.GetString(value)))
{
// code if session "Id" is not set or has an empty value
}
else
{
// code if session "Id" is set and has a value
}