comparing session variable value to a string

问题

I am comparing the session variable to a string to check if the login type is administrator or not.

Code i am using :

if (Session["loggedInUsername"] == null)
        {
            btnLogin.Text = "Sign In";
            lblWelcome.Text = "Welcome!";
            hypManageRestaurants.Enabled = false;
            hypManageReviews.Enabled = false;
            hypPostReviews.Enabled = false;

        }
        else
        {
            if (Session["loggedInUserType"] == "Administrator")
            {
                hypManageRestaurants.Enabled = true;
                hypManageReviews.Enabled = true;
                hypPostReviews.Enabled = true;
            }
            else
            {
                hypManageRestaurants.Enabled = false;
                hypManageReviews.Enabled = false;
                hypPostReviews.Enabled = true;
            }
            lblWelcome.Text = "Welcome " + Session["loggedInUsername"];

            btnLogin.Text = "Sign Out";
        }

So first I am checking if any user has logged in or not. If the user logs in successfully, the session variable "loggedInUsername" will have the value of the username. If the "loggedInUsername" session variable is not empty, it will check "loggedInUserType" session variable for the type of the logged in user.

Here comes the weird thing, the value of the "loggedInUserType" is exactly "Administrator" without the "", at the if function where I am comparing the session variable to the string "Administrator" is being skipped and goes to the else.

All session variables are getting values when the user logs in.

Below is the data which I am using to login and this record is the only record which have a type of "Administrator".

link to image

Is there any other method to compare a session variable to a string

回答1:

Cast the object type value to a string

((string)Session["loggedInUserType"]) == "Administrator"

回答2:

Try

if(Convert.ToString(Session["loggedInUserType"]) == "Administrator) ...

回答3:

Try this:

if (Session["loggedInUserType"].ToString().Trim()
        .Equals("Administrator", StringComparison.InvariantCultureIgnoreCase))

回答4:

Are you sure that all whitespace has been trimmed from the end of the Session["loggedInUserType"]?

回答5:

if (Session["loggedInUserType"].ToString() == "Administrator")

回答6:

The Session collection returns values of type Object, so when you compare that to a string you will be comparing the values of the object references, not comparing the string values.

Cast the object reference to string:

if (((string)Session["loggedInUserType"]) == "Administrator")

回答7:

You can do this :

string session = (string)Session["loggedInUserType"]

if (session == "Administrator")

or your Session can be in a specific class with getters.

回答8:

if(Convert.ToString(Session["loggedInUserType"]) == "Administrator)

In this way, no need to check null value becuase Convert.ToString handle Null value return "" empty string

来源：https://stackoverflow.com/questions/10686953/comparing-session-variable-value-to-a-string

标签

ASP.NET

session-variables