从ASP.NET Core 1.0更新到1.1后出现问题

Question

在此Official ASP.NET Article之后，我从ASP.NET Core 1.0更新到1.1。但是在编译我的ASP.NET Core项目时，我在AccountController.cs文件中收到以下错误：

错误：

Statement

以下操作方法结束时，错误位于第The call is ambiguous between the following methods or properties: 'System.Security.Claims.PrincipalExtensions.FindFirstValue(System.Security.Claims.ClaimsPrincipal, string)' and 'System.Security.Claims.PrincipalExtensions.FindFirstValue(System.Security.Claims.ClaimsPrincipal, string)' 行：

var email = info.Principal.FindFirstValue(ClaimTypes.Email);

project.json ：

public async Task<IActionResult> ExternalLoginCallback(string returnUrl = null, string remoteError = null)
        {
            if (remoteError != null)
            {
                ModelState.AddModelError(string.Empty, $"Error from external provider: {remoteError}");
                return View(nameof(Login));
            }
            var info = await _signInManager.GetExternalLoginInfoAsync();
            if (info == null)
            {
                return RedirectToAction(nameof(Login));
            }

            // Sign in the user with this external login provider if the user already has a login.
            var result = await _signInManager.ExternalLoginSignInAsync(info.LoginProvider, info.ProviderKey, isPersistent: false);
            if (result.Succeeded)
            {
                _logger.LogInformation(5, "User logged in with {Name} provider.", info.LoginProvider);
                return RedirectToLocal(returnUrl);
            }
            if (result.RequiresTwoFactor)
            {
                return RedirectToAction(nameof(SendCode), new { ReturnUrl = returnUrl });
            }
            if (result.IsLockedOut)
            {
                return View("Lockout");
            }
            else
            {
                // If the user does not have an account, then ask the user to create an account.
                ViewData["ReturnUrl"] = returnUrl;
                ViewData["LoginProvider"] = info.LoginProvider;
                var email = info.Principal.FindFirstValue(ClaimTypes.Email);
                return View("ExternalLoginConfirmation", new ExternalLoginConfirmationViewModel { Email = email });
            }
        }

Answer 1

尝试从依赖项中删除"Microsoft.AspNet.Identity.EntityFramework": "3.0.0-rc1-final"。混合来自不同版本的软件包 - 在这种情况下，RTM和1.1.0之前通常会导致API模糊不清。