为什么 `UserManager.ConfirmEmailAsync` 会针对无效用户抛出异常?

Why does `UserManager.ConfirmEmailAsync` throw for an invalid user?

根据我在 ConfirmEmail 中的代码:

var result = await UserManager.ConfirmEmailAsync(userId, code);
if (result.Succeeded)
{
    model.Message = "Thank you for confirming your email.";
    model.IsConfirmed = true;
    return View(model);
}

基于标准 MVC 5 项目模板中的代码,我预计无效用户会导致 result.Succeeded == false,而不是让 ConfirmEmailAsync 抛出 InvalidOperationException

UserManager.ConfirmEmailAsync的源代码是:

public virtual async Task<IdentityResult> ConfirmEmailAsync(TKey userId, string token)
{
    ThrowIfDisposed();
    var store = GetEmailStore();
    var user = await FindByIdAsync(userId).ConfigureAwait(false);
    if (user == null)
    {
        throw new InvalidOperationException(String.Format(CultureInfo.CurrentCulture, Resources.UserIdNotFound, userId));
    }
    if (!await VerifyUserTokenAsync(userId, "Confirmation", token))
    {
        return IdentityResult.Failed(Resources.InvalidToken);
    }
    await store.SetEmailConfirmedAsync(user, true).ConfigureAwait(false);
    return await UpdateAsync(user).ConfigureAwait(false);
}

您可以看到当使用 FindByIdAsync(userId) 找不到用户时抛出 InvalidOperationException

所以这种行为是设计使然。