Is this possible to retrieve data from mysql table from one session?
For example I have the Session["username"] that show me the name of the user.
but If I want to know the gender of the user, I can know it through only one session?
For example Session["username"].gender ??
instead of opening another Session for gender?
someone told me to open a class in app_code:
public class user
{
public string username { get; set; }
public string gender { get; set; }
}
But I dont know how to use it with only one session.
If its possible, show me how pls!
Related
I have an application that shows a form to the users. The form is taken by the server and stored in a database where the information can be read on another page in the application. Part of the form takes an image, where the image is converted to a Base64 string and sent to Azure to be stored, and the URL to the image is stored in the database as a string. This all works fine. My trouble comes from trying to implement a feature where users can select multiple images.
I tried changing the string Image {get;set;} to a List<string> {get;set;} where the database would just store a list of the URLs where I could iterate through them in the application. This obviously did not work, as through some research, I learned that databases cannot store lists.
I am now wondering what I can do here. Is there a simpler way of doing this that I'm missing? What am I doing wrong?
I tried changing the string Image {get;set;} to a List
{get;set;} where the database would just store a list of the URLs
where I could iterate through them in the application. This obviously
did not work, as through some research, I learned that databases
cannot store lists.
You can try to use the following methods:
Add separator between the Image urls. Use string Image {get;set;} to store the image urls, the value like this: "image1url,image2url,etc" (use the , as the separator). You can consider using the String.Join Method.
Create a new Image table to store the Image information (contains ID, Name, Urls), then configure one-to-many relationship between the Main table and the Image model. In the Main model, use navigation property to add the Image. Code like this:
public class Main
{
public int Id { get; set; }
public string Name { get; set; }
public List<Image> Images { get; set; }
}
public class Image
{
public int Id { get; set; }
public string Name { get; set; }
public string Url { get; set; }
}
More detail information about the Entity relationship, see:
Relationships
Configuring One To Many Relationships in Entity Framework Core
Saving Related Data
My current employer is developing a mobile app using Xamarin.Forms and Asp.net mvc on the backend. I suggested to use realm in the mobile app. My manager want to see a POC(Proof of concept) app using realm with backlink feature before allowing it to be used in the app. I am working on the POC on GitHub . The documentation is very limiting and the GitHub repo of realm-dotnet don’t have good sample.
I completed the project. But unable to implement backlink. The sample app I have developed allow user to create assignees(employees) in the first page. The user can delete or edit the employees using context menu. When the user clicks on the employee name the app navigates to the ToDoListPage of that particular employee. Here the user can create ToDoItems. On this ToDoList page I want to show the ToDoItems that where assigned to that employee only.
The models were as follows:
public class Assignee : RealmObject
{
public Assignee()
{
ToDoItems = Enumerable.Empty<ToDoItem>().AsQueryable();
}
[PrimaryKey]
public string Id { get; set; } = Guid.NewGuid().ToString();
public string Name { get; set; }
public string Role { get; set; }
[Backlink(nameof(ToDoItem.Employee))]
public IQueryable<ToDoItem> ToDoItems { get; }
}
public class ToDoItem : RealmObject
{
[PrimaryKey]
public string Id { get; set; } = Guid.NewGuid().ToString();
public string Name { get; set; }
public string Description { get; set; }
public bool Done { get; set; }
public Assignee Employee { get; set; }
}
I am adding employee to each ToDo Item:
Item.Employee = Employee;
_realm.Add(Item);
Now I want to access the ToDoItems for the Employee:
Items = _realm.All<Assignee>().Where(x => x.Id == EmployeeId).FirstOrDefault().ToDoItems;
But this does not work. I will be grateful if someone can help me out by preferably writing code in my sample app or write the correct code in the reply.
Thank you
Firstly, Realm .NET doesn't currently support traversing properties (x.Employee.Id). Due to this, when I start the app and try to go to the ToDoListPage, the app crashes with the exception:
The left-hand side of the Equal operator must be a direct access to a persisted property in Realm
Realm supports object comparison, so we can fix this like so:
var employee = _realm.Find<Assignee>(EmployeeId);
Items = _realm.All<ToDoItem>().Where(x => x.Employee == employee);
Secondly, everything seemed fine in your code, so I dug a bit deeper and saw why it isn't working. The issue is that when we try to get all items with the code above, the EmployeeId parameter is null. Since the EmployeeId is being populated after the load logic has been triggered, we don't need to load the data in the ctor. So you can remove this code.
Finally, since you won't be loading the data in the ctor, and instead in the SetValues method, the UI needs to know, when the data has been updated, what exactly to redraw. Thus, you need to mark the collection to be Reactive too:
[Reactive]
public IEnumerable<ToDoItem> Items { get; set; }
Then, you need to change the SetValues method to use object comparison, instead of traversing:
async Task SetValues()
{
Employee = _realm.Find<Assignee>(EmployeeId);
Title = Employee.Name;
Items = _realm.All<ToDoItem>().Where(x => x.Employee == Employee);
}
To sum up - you don't need to try and load the data in the ctor, since you don't know when the EmployeeId will be set. You are already tracking when the property will change and inside the SetValues command you simply need to change the expression predicate.
I am trying to use .NET identity.
My user has properties which are related to auth. For example, email address, password, projects user has access to, etc.
Also, the user has other fields, for example favourite color.
Because color is not related to authentication, I don't want to add color as a property of ApplicationUser : IdentityUser {}.
But somehow I need to write values into that field, so I could write a repository, which takes the regular User object. But in that case I need to write the repository, hash the password myself, so what's the point having .NET Identity?
A third solution would be to make 2 tables, one for the ApplicationUser, and one for the related properties, but we already have a database, and I don't want to change everything.
One more idea what I could think of is to have ApplicationUser : IdentityUser {} as basibally a copy of User (I can't inherit from user and IdentityUser too, and can't chain it, because of database first) and have a separate AuthenticationUser : IdentityUser in the auth. context.
How sould I do it?
thanks
I think for this issue you have to change your model like:
public class Person
{
public string Color { get; set: }
public int RoleId { get; set: }
public Role Role { get; set: }
public ICollection<UserAuthentication> UserAuthentications { get; set: }
}
public class UserAuthentication
{
public Person Person { get; set: }
public int PersonId { get; set: }
}
With these models you don't have this problem.
If you have any data, you can displace that using TSql.
I am trying to update user details.
Here is my code.
My Model-
public class ApplicationUser : IdentityUser
{
public string Name { get; set; }
public string MobileNumber { get; set; }
public string Email { get; set; }
}
The Controller-
[HttpPost]
public ActionResult UpdateUser(ApplicationUser UserProfile)
{
if (ModelState.IsValid)
{
var result = UserManager.Update(UserProfile);
if (result.Succeeded)
return View(UserProfile);
else
{
return View(UserProfile);
}
}
return View(UserProfile);
}
"result.Error.strings" gets the value
Name suresh already taken
Based upon the the error message, i'm guessing your Database already has the user with name Suresh
Try another name if the error still exists update your question and my be you can get more help.
The other way you could update an user could be first find the user then update the required fields then update(save) user.
I had the same problem. figured out that when one does not set the ID of the user that needs to be updated, the EF context undercover treats the user object as the new entity.
fixing the error with the ID, I've got a new error, so to help anyone struggling (and to scip a couple of steps) - I pointing to an answer that explains it:
asp.net identity 2.0 update user
I an using Session for storing UserName for whole project.
But it always time out before 20 min.
I want set value in properties and want to use in project but when my page is loading again its showing null value.
How can i save this value in this?
Code what i am using.
public string UserName {get; set; }
public string Password {get; set;}
Properties are a language construct (not an ASP.NET feature) and won't survive either.
You should persist the information in a database or up the session timeout.
With a public string UserName {get; set;} you don't set anything in the Session.
Use this instead:
public string UserName
{
get { return Session["UserName"] as string; }
set { Session["UserName"] = value; }
}