ApplicationSignInManager类抛出无效的强制转换异常

Question

This is the code taken from the MVC5 account controller class ( this is created as a template when you set up a asp.net project) However when i pass in the following parameter to this line of code

model.UserName="User1", model.password="Password1",model.RememberMe=false, shouldLockout=false

 var result = await SignInManager.PasswordSignInAsync(model.UserName, model.Password, model.RememberMe, shouldLockout: false); 

it throws an exception saying

Unable to cast object of type 'System.Int32' to type 'System.String'.

What i don't understand is why does the line of code above thinks the parameter is int when all the parameter are either string or boolean.

Anyone up for help? Thanks for advance.

    [HttpPost]
    [AllowAnonymous]
    [ValidateAntiForgeryToken]
    public async Task<ActionResult> Login(LoginViewModel model, string returnUrl)
    {
        if (!ModelState.IsValid)
        {
            return View(model);
        }
        // This doesn't count login failures towards account lockout
        // To enable password failures to trigger account lockout, change to shouldLockout: true
        var result = await SignInManager.PasswordSignInAsync(model.UserName, model.Password, model.RememberMe, shouldLockout: false);   

    }

Code for LoginViewModel Class

public class LoginViewModel
{
    [Required]
    [Display(Name = "User name")]
    public string UserName { get; set; }

    [Required]
    [DataType(DataType.Password)]
    [Display(Name = "Password")]
    public string Password { get; set; }

    [Display(Name = "Remember me?")]
    public bool RememberMe { get; set; }
}

Answer 1

In attempting to resolve a very similar error (Unable to cast object of type system.guid to type system.string) for the same scenario, I traced the problem to the data types that had been used for the key columns of two Roles tables (AspNetRoles and AspNetUserRoles). These needed to be of type nvarchar , not uniqueidentifier.

The SQL query behind PasswordSignInAsync gathers data from AspNetUsers, AspNetUserRoles, AspNetUserClaims and AspNetUserLogins so I suggest you check that your key column types across all of these tables match what the expected entities that this data will be mapped to. As far as I'm aware, these should be as follows:

AspNetUsers > [Id] NVARCHAR (128)

AspNetRoles > [Id] NVARCHAR (128)

AspNetUserRoles > [UserId] NVARCHAR (128), [RoleId] NVARCHAR (128)

AspNetUserClaims > [Id] INT

AspNetUserLogins > [UserId] NVARCHAR (128)