Question

是否出于某些目的而搭建了某些身份页面（登录，注销，注册），并已将Google添加为外部提供商。它可以工作，但是当我在“身份/帐户/外部登录”页面上点击注册时，出现以下错误：

InvalidOperationException：无法跟踪实体类型“ IdentityUserLogin”的实例，因为已经跟踪了另一个具有相同的{'LoginProvider'，'ProviderKey'}键值的实例。

是否需要脚手架ExternalLogin检查可能出了什么问题：这是（标准）代码：

public async Task<IActionResult> OnPostConfirmationAsync(string returnUrl = null)
{
    returnUrl = returnUrl ?? Url.Content("~/");
    // Get the information about the user from the external login provider
    var info = await _signInManager.GetExternalLoginInfoAsync();
    if (info == null)
    {
        ErrorMessage = "Error loading external login information during confirmation.";
        return RedirectToPage("./Login", new { ReturnUrl = returnUrl });
    }

    if (ModelState.IsValid)
    {
        var user = new IdentityUser { UserName = Input.Email, Email = Input.Email };
        var result = await _userManager.CreateAsync(user);
        if (result.Succeeded)
        {
            result = await _userManager.AddLoginAsync(user, info);
            if (result.Succeeded)
            ...

await _userManager.AddLoginAsync（user，info）给出了所提到的异常。

    InvalidOperationException: The instance of entity type 'IdentityUserLogin<string>' cannot be tracked because another instance with the same key value for {'LoginProvider', 'ProviderKey'} is already being tracked. When attaching existing entities, ensure that only one entity instance with a given key value is attached. Consider using 'DbContextOptionsBuilder.EnableSensitiveDataLogging' to see the conflicting key values.
Microsoft.EntityFrameworkCore.ChangeTracking.Internal.IdentityMap<TKey>.ThrowIdentityConflict(InternalEntityEntry entry)
Microsoft.EntityFrameworkCore.ChangeTracking.Internal.IdentityMap<TKey>.Add(TKey key, InternalEntityEntry entry, bool updateDuplicate)
Microsoft.EntityFrameworkCore.ChangeTracking.Internal.IdentityMap<TKey>.Add(TKey key, InternalEntityEntry entry)
Microsoft.EntityFrameworkCore.ChangeTracking.Internal.NullableKeyIdentityMap<TKey>.Add(InternalEntityEntry entry)
Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.StartTracking(InternalEntityEntry entry)
Microsoft.EntityFrameworkCore.ChangeTracking.Internal.InternalEntityEntry.SetEntityState(EntityState oldState, EntityState newState, bool acceptChanges)
Microsoft.EntityFrameworkCore.ChangeTracking.Internal.InternalEntityEntry.SetEntityState(EntityState entityState, bool acceptChanges, Nullable<EntityState> forceStateWhenUnknownKey)
Microsoft.EntityFrameworkCore.ChangeTracking.Internal.EntityGraphAttacher.PaintAction(EntityEntryGraphNode node, bool force)
Microsoft.EntityFrameworkCore.ChangeTracking.Internal.EntityEntryGraphIterator.TraverseGraph<TState>(EntityEntryGraphNode node, TState state, Func<EntityEntryGraphNode, TState, bool> handleNode)
Microsoft.EntityFrameworkCore.ChangeTracking.Internal.EntityGraphAttacher.AttachGraph(InternalEntityEntry rootEntry, EntityState entityState, bool forceStateWhenUnknownKey)
Microsoft.EntityFrameworkCore.DbContext.SetEntityState(InternalEntityEntry entry, EntityState entityState)
Microsoft.EntityFrameworkCore.DbContext.SetEntityState<TEntity>(TEntity entity, EntityState entityState)
Microsoft.EntityFrameworkCore.DbContext.Add<TEntity>(TEntity entity)
Microsoft.EntityFrameworkCore.Internal.InternalDbSet<TEntity>.Add(TEntity entity)
Microsoft.AspNetCore.Identity.EntityFrameworkCore.UserOnlyStore<TUser, TContext, TKey, TUserClaim, TUserLogin, TUserToken>.AddLoginAsync(TUser user, UserLoginInfo login, CancellationToken cancellationToken)
Microsoft.AspNetCore.Identity.UserManager<TUser>.AddLoginAsync(TUser user, UserLoginInfo login)
Project.Areas.Identity.Pages.Account.ExternalLoginModel.OnPostConfirmationAsync(string returnUrl) in ExternalLogin.cshtml.cs
+
   result = await _userManager.AddLoginAsync(user, info);

该如何解决？预先感谢您的帮助！

外部登录失败asp.net MVC Core 2.2

0 个答案: