Asp.net 将Identity PK更改为int后：从物化的'；System.Int32'；键入'；System.String'；类型无效

使用Identity 2的ASP.NET网站web表单应用程序（VS 2015）。使用标准模板生成的站点（都使用字符串Id），按照教程将Users表的主键更改为Int，这就是问题开始的地方。似乎EF正在登录时检索记录，但无法填充ApplicationUser对象

如果需要的话，可以直接在SQL中编辑用户表（而不是先编码）。尝试用Id（Int）重写IdentityUser的Id（string）属性，但编译器拒绝使用不同的返回类型。建议

Line 26:       **Dim user As ApplicationUser = manager.Find(Email.Text, Password.Text)**
Line 27:       If user IsNot Nothing Then

错误跟踪：

[InvalidOperationException: The specified cast from a materialized 'System.Int32' type to the 'System.String' type is not valid.]
   System.Data.Entity.Core.Common.Internal.Materialization.ErrorHandlingValueReader`1.GetValue(DbDataReader reader, Int32 ordinal) +235
   lambda_method(Closure , Shaper ) +164
   System.Data.Entity.Core.Common.Internal.Materialization.Coordinator`1.ReadNextElement(Shaper shaper) +181
   System.Data.Entity.Core.Common.Internal.Materialization.<MoveNextAsync>d__4.MoveNext() +374
   System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +92
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +58
   System.Data.Entity.Internal.<FirstMoveNextAsync>d__0.MoveNext() +513
   System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +92
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +58
   System.Data.Entity.Infrastructure.<FirstOrDefaultAsync>d__25`1.MoveNext() +350
   System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +92
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +58
   Microsoft.AspNet.Identity.CultureAwaiter`1.GetResult() +59
   Microsoft.AspNet.Identity.EntityFramework.<GetUserAggregateAsync>d__68.MoveNext() +346
   System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +92
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +58
   Microsoft.AspNet.Identity.CultureAwaiter`1.GetResult() +59
   Microsoft.AspNet.Identity.<FindAsync>d__12.MoveNext() +272
   System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +92
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +58
   Microsoft.AspNet.Identity.AsyncHelper.RunSync(Func`1 func) +281
   Microsoft.AspNet.Identity.UserManagerExtensions.Find(UserManager`2 manager, String userName, String password) +168
   Account_Login.LogIn(Object sender, EventArgs e) in C:\Users\Lauren\Documents\Visual Studio 2015\WebSites\Template\Account\Login.aspx.vb:26
   System.Web.UI.WebControls.Button.OnClick(EventArgs e) +109
   System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +108
   System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +10
   System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +13
   System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +31
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3449

[InvalidOperationException:从物化的'System.Int32'类型到'System.String'类型的指定强制转换无效。]
System.Data.Entity.Core.Common.Internal.Materialization.ErrorHandlingValueReader`1.GetValue（DbDataReader，Int32序号）+235
lambda_法（闭包、整形器）+164
System.Data.Entity.Core.Common.Internal.Materialization.Coordinator`1.ReadNextElement（Shaper-Shaper）+181
System.Data.Entity.Core.Common.Internal.Materialization.d_u4.MoveNext（）+374
System.Runtime.CompilerServices.TaskWaiter.ThrowForNonSuccess（任务任务）+92
System.Runtime.CompilerServices.TaskWaiter.HandleNonSuccessAndDebuggerNotification（任务）+58
System.Data.Entity.Internal.d_u0.MoveNext（）+513
System.Runtime.CompilerServices.TaskWaiter.ThrowForNonSuccess（任务任务）+92
System.Runtime.CompilerServices.TaskWaiter.HandleNonSuccessAndDebuggerNotification（任务）+58
System.Data.Entity.Infrastructure.d_u25`1.MoveNext（）+350
System.Runtime.CompilerServices.TaskWaiter.ThrowForNonSuccess（任务任务）+92
System.Runtime.CompilerServices.TaskWaiter.HandleNonSuccessAndDebuggerNotification（任务）+58
Microsoft.AspNet.Identity.CultureaWater`1.GetResult（）+59
Microsoft.AspNet.Identity.EntityFramework.d_u68.MoveNext（）+346
System.Runtime.CompilerServices.TaskWaiter.ThrowForNonSuccess（任务任务）+92
System.Runtime.CompilerServices.TaskWaiter.HandleNonSuccessAndDebuggerNotification（任务）+58
Microsoft.AspNet.Identity.CultureaWater`1.GetResult（）+59
Microsoft.AspNet.Identity.d_u12.MoveNext（）+272
System.Runtime.CompilerServices.TaskWaiter.ThrowForNonSuccess（任务任务）+92
System.Runtime.CompilerServices.TaskWaiter.HandleNonSuccessAndDebuggerNotification（任务）+58
Microsoft.AspNet.Identity.AsyncHelper.RunSync（Func`1 Func）+281
Microsoft.AspNet.Identity.UserManager.Find（UserManager`2管理器，字符串用户名，字符串密码）+168
C:\Users\Lauren\Documents\Visual Studio 2015\WebSites\Template\Account\Login.aspx.vb:26中的Account\u Login.Login（对象发送者，事件参数e）
System.Web.UI.WebControls.Button.OnClick（EventArgs e）+109
System.Web.UI.WebControl.Button.RaisePostBackEvent（String eventArgument）+108
System.Web.UI.WebControl.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent（String eventArgument）+10
System.Web.UI.Page.RaisePostBackEvent（IPostBackEventHandler sourceControl，String eventArgument）+13
System.Web.UI.Page.RaisePostBackEvent（NameValueCollection postData）+31
System.Web.UI.Page.ProcessRequestMain（布尔includeStagesBeforeAsyncPoint，布尔includeStagesAfterAsyncPoint）+3449

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版本信息：Microsoft.NET Framework版本：4.0.30319；ASP.NET版本：4.6.57.0

我在

UserManager.AddRole（userId，roleId）

期间遇到此问题。有什么线索可以解决这个问题吗？我找到了答案，看看这个：