ASP.NET core InvalidOperationException: 'No database provider has been configured for this DbContext./

Question

I wanan save data on my app but i get

InvalidOperationException, 'No database provider has been configured for this DbContext.'

My code is below

public IActionResult Create(ProjectViewModel viewModel)
{
    ApplicationDbContext dbContext = new ApplicationDbContext(new Microsoft.EntityFrameworkCore.DbContextOptions<ApplicationDbContext>());
    dbContext.Project.Add(new Project()
    {
       ProjectName = viewModel.ProjectName,
       ProjectStart = viewModel.StartDate,
       ProjectEnd = viewModel.DeadLine,
       Priority = viewModel.Priority,
       Target = viewModel.Target,
       ProjectDescription = viewModel.Description,
       ProjectParts = viewModel.Amountofparts
    });
    dbContext.SaveChanges();
    return View(nameof(NewProject));
}

How can I fix it, any help would be appreciated.

Answer 1

需要将dbContext添加到服务中，如下所示：https: //docs.microsoft.com/zh-cn/aspnet/core/security/authentication/identity?view = aspnetcore-2.1&tabs = visual-studio否则，您需要指定连接字符串在您的声明中