Assigned Value To Variable Using Ajax fails

Question

User1349647816 posted

Hi Guys, I have an ajax method that passes a value to a function in my controller, the function in my controller then takes the value that's passed to it and assigns that value to a private variable in the class, that part works fine however when I call another method from the same class class to access the value of the private variable the value always comes back as 0. Here's my code

$.ajax({
type: 'POST',
dataType: "JSON",
data: { mCount : number },
url: '/mPost/mMethod'
});

and heres the code in my controller

private int mCount { get; set; }

public void mMethod(int number)
{
mCount = number ;
}

public void method2() {

//Trying to access mCount from here always gives me 0

}

Answer 1

User475983607 posted

Hi Guys, I have an ajax method that passes a value to a function in my controller, the function in my controller then takes the value that's passed to it and assigns that value to a private variable in the class, that part works fine however when I call another method from the same class class to access the value of the private variable the value always comes back as 0. Here's my code

$.ajax({
type: 'POST',
dataType: "JSON",
data: { mCount : number },
url: '/mPost/mMethod'
});

and heres the code in my controller

private int mCount { get; set; }

public void mMethod(int number)
{
mCount = number ;
}

public void method2() {

//Trying to access mCount from here always gives me 0

}

Controllers exist only for the duration of the request.  A new request creates new controller and a new mCount.   That's why mCount is zero on the next request.

State management is always a programming problem to solve in web development.  There are many ways to manage state in ASP.NET Core as illustrated in the fundamental docs; https://docs.microsoft.com/en-us/aspnet/core/fundamentals/app-state?view=aspnetcore-2.1

Answer 2

User1520731567 posted

Hi ShatterStar,

I suggest you could change the type of mCount:

private int mCount { get; set; }

to:

private static int mCount { get; set; }

It will remember the result of the previous call assignment.

Best Regards.

Yuki Tao

Answer 3

User-474980206 posted
Using a static will only work if the site only supports one user. As a static value is shared with all user requests.

Answer 4

User1349647816 posted

Hi this worked but as Bruce said below this would present a problem when the website has multiple users.