Razor 页面问题与传递值中介

Question

这是我的.cshtml

        <label asp-for="CreateAccount.Email"></label>
        <input asp-for="CreateAccount.Email" class="form-control" />
        <span asp-validation-for="CreateAccount.Email" class="text-danger"></span>

这是cshtml.cs

[BindProperty]
public CreateAccountCommand CreateAccount { get; set; }

public async Task<IActionResult> OnPostAsync(CreateAccountCommand command)
{
    if (ModelState.IsValid)
    {
        await _mediator.Send(command);
   }
    else
   {

   }
    return Page();
}

这是 CreateAccountCommand

public class CreateAccountCommand : IRequest
{
public string Email { get; set; }
}

这是 CreateAccountHandler

public class CreateAccountHandler : IRequestHandler<CreateAccountCommand, Unit>
{
private readonly YourMeetingDbContext _dbContext;

public CreateAccountHandler(YourMeetingDbContext dbContext)
{
    _dbContext = dbContext;
}
public async Task<Unit> Handle(CreateAccountCommand request, CancellationToken cancellationToken)
{
    var entity = new ApplicationUser
    {
        Email = request.Email,
    }; 
}

如何将值传递给 CreateAccountHandler 并使用 Email 值创建新的 ApplicationUser？ 如果我现在尝试，公共字符串 Email { get; 放; } 取值 Email，但如果我调用 await _mediator.Send（命令），则此 Email 为空。