Fixing the Entity Type ApplicationUser not Found Error in Current Context Model: Best Solutions

If you are a developer, you must have come across the "Entity Type ApplicationUser not found error in current context model" at some point. This error occurs when you try to run your ASP.NET Core application, and it prevents your application from running correctly. Fortunately, there are several solutions to this problem, and this guide will provide you with a step-by-step solution to fix it.

What is the Entity Type ApplicationUser not Found Error?

The Entity Type ApplicationUser not Found Error occurs when you use the Identity Framework in ASP.NET Core to create an ApplicationUser class. The ApplicationUser class is used to manage user authentication and authorization. However, when you try to run your application, you may encounter an error message that says "Entity Type ApplicationUser not found". This error message means that the Entity Framework cannot find the ApplicationUser class that you created.

Best Solutions to Fix the Entity Type ApplicationUser not Found Error

Solution 1: Add the ApplicationUser Class to the DbContext

The first solution to fix the Entity Type ApplicationUser not found error is to add the ApplicationUser class to the DbContext. To do this, follow these steps:

1. Open the ApplicationDbContext.cs file.
2. Add the following code to the ApplicationDbContext class:

public class ApplicationDbContext : IdentityDbContext<ApplicationUser>
{
    public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options)
        : base(options)
    {
    }
}

1. Save the file and try running your application again.

Solution 2: Check the ApplicationUser Namespace

The second solution to fix the Entity Type ApplicationUser not found error is to check the namespace of the ApplicationUser class. To do this, follow these steps:

1. Open the ApplicationUser.cs file.
2. Check the namespace of the ApplicationUser class. It should be the same as the namespace of the ApplicationDbContext class.
3. If the namespaces are different, change the namespace of the ApplicationUser class to match the namespace of the ApplicationDbContext class.
4. Save the file and try running your application again.

Solution 3: Check the Startup.cs File

The third solution to fix the Entity Type ApplicationUser not found error is to check the Startup.cs file. To do this, follow these steps:

1. Open the Startup.cs file.
2. Check the ConfigureServices method. It should contain the following code:

services.AddDbContext<ApplicationDbContext>(options =>
    options.UseSqlServer(
        Configuration.GetConnectionString("DefaultConnection")));
services.AddDefaultIdentity<ApplicationUser>()
    .AddEntityFrameworkStores<ApplicationDbContext>();

1. If the code is missing, add it to the ConfigureServices method.
2. Save the file and try running your application again.

FAQ

Q1: What causes the Entity Type ApplicationUser not found error?

A: The Entity Type ApplicationUser not found error occurs when the Entity Framework cannot find the ApplicationUser class that you created.

Q2: How do I add the ApplicationUser class to the DbContext?

A: To add the ApplicationUser class to the DbContext, open the ApplicationDbContext.cs file and add the following code to the ApplicationDbContext class:

public class ApplicationDbContext : IdentityDbContext<ApplicationUser>
{
    public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options)
        : base(options)
    {
    }
}

Q3: How do I check the namespace of the ApplicationUser class?

A: To check the namespace of the ApplicationUser class, open the ApplicationUser.cs file and look at the namespace declaration.

Q4: How do I check the ConfigureServices method in the Startup.cs file?

A: To check the ConfigureServices method in the Startup.cs file, open the Startup.cs file and look for the ConfigureServices method. It should contain the following code:

services.AddDbContext<ApplicationDbContext>(options =>
    options.UseSqlServer(
        Configuration.GetConnectionString("DefaultConnection")));
services.AddDefaultIdentity<ApplicationUser>()
    .AddEntityFrameworkStores<ApplicationDbContext>();

Q5: What is the ApplicationDbContext class?

A: The ApplicationDbContext class is a class that inherits from the IdentityDbContext class and is used to manage the database context for the Identity Framework in ASP.NET Core.

Conclusion

The Entity Type ApplicationUser not Found Error can be a frustrating error for developers. However, with the solutions provided in this guide, you can easily fix this error and get your application running smoothly again. Remember to always check the namespace of the ApplicationUser class, add it to the DbContext, and check the ConfigureServices method in the Startup.cs file. With these steps, you should be able to fix the Entity Type ApplicationUser not Found Error and get back to developing your application.

Related Links

• Microsoft documentation on using Identity in ASP.NET Core
• Tutorial on creating a custom ApplicationUser class in ASP.NET Core