在 ASP.NET CORE 中重定向页面后保存字符串变量的最佳方法

Question

How can I save the form values as a string after the page is redirected?

I use a static variable, if the number of users on the site increases for example 20000, will the site have problems?

Which method is better?

1. Using a static variable?

2. session?

3. Cookies?

4. ViewBag?

5. View State?

6. sql server database?

Answer 1

Actually, There is no the best method, Only the most suitable method. The methods you list above all have their own most suitable use cases.

From your comment, I think you may wanna redirect to another page with a string parameter, So you can try to use:

return RedirectToAction("actionName","controllerName",new { Name="xxx"});

It will send a get request: acontrollerName/actionName?Name=xxx .

Or, if you wanna save that string value for a long time, You can also try to use Session or Database . But one thing you need to consider is that you need to set the session time out according to the actual situation of your project.

==========================edited===========================

I think you can use Session to achieve it.

public class TestModel
    {
        public int ID { get; set; }
        public string Name { get; set; }
    }


public async Task<IActionResult> OnPostSelectMenu(int selectedid)
        {
            TestModel selected = await _db.Table.FindAsync(selectedid);
             //set session
            HttpContext.Session.SetString("Key", JsonConvert.SerializeObject(selected));
            return RedirectToPage("MyPage");
        }

public async Task<IActionResult> OnGetAsync()
        {
            //......

            //get session
            Input = JsonConvert.DeserializeObject<TestModel>(HttpContext.Session.GetString("Key"));
            return Page();
        }

Answer 2

no i dont want to redirect to other page i want give string value after refresh current page How can I save the form values as a string after the page is refreshed?

this is my model:

public int ID { get; set; }
public string Name { get; set; }

static variable:

public static int IDWordsaver = 0;

On Get for MyPage:

public async Task<IActionResult> OnGetAsync()
        {
            await LoadAsync();
            return Page();
        }

private async Task LoadAsync()
        {
            if (IDWordsaver != 0)
            {
                var SetRecord = _db.Table.FirstOrDefault(u => u.ID == IDWordsaver);
                ID = IDWordsaver;
                Input = new InputModel
                {
                    Name = SetRecord.Name
                };
            }
        }

i use this button for select one record from data base:

<button asp-page-handler="SelectMenu" name="selectedid" value=@item.ID class="btn btn-primary" formnovalidate>Select</button>


public async Task<IActionResult> OnPostSelectMenu(int selectedid)
        {
            var selected = await _db.Table.FindAsync(selectedid);
            ID = selected.ID;
            Input.Name = selected.Name;
            IDWordsaver = selectedid;
            return RedirectToPage("MyPage", new { IDWordsaver });
        }