选择身份用户声明给出错误

Question

    [HttpPost]
    [ValidateAntiForgeryToken]
    public async Task<IActionResult> EditUser(EditUserViewModel viewModel)
    {
        if (!ModelState.IsValid) return View();

        var user = await _userManager.FindByIdAsync(viewModel.Id);

        if (user == null) return RedirectToAction("Index", "Admin");

        var userClaims = await _userManager.GetClaimsAsync(user);
        
        if (viewModel.Admin)
        {
            if (!userClaims.Select(c => c.Value == "Admin").Any())
                await _userManager.AddClaimAsync(user, new Claim("Admin", "Admin"));
        }
        else
        {
            if (userClaims.Select(c => c.Value == "Admin").Any())
                await _userManager.RemoveClaimAsync(user, new Claim("Admin", "Admin"));
        }

        user.FirstName = viewModel.FirstName;
        user.LastName = viewModel.LastName;

        var result = await _userManager.UpdateAsync(user);

        if (result.Succeeded) return RedirectToAction("Index", "Admin");

        ModelState.AddModelError("", "Something went wrong");

        return View();
    }

当检查管理员声明存在时给出错误：

c.Value=error CS0103: The name 'c' does not exist in the current context

The thread 0x990 has exited with code 0 (0x0).

Error Error image

Answer 1

正如评论中讨论的那样，没有错。 Visual Studio 只是向您展示了 c 的潜在价值，但它还不在范围内。

正如您现在看到的，一旦您在中放置断点，Linq Select、c 就会有一个值。

最后，线程消息是一条常规消息，表明某个线程已完成其工作。