小编Ped*_*mos的帖子

我正在尝试使用以下代码向数据库添加一个新用户：

public async void SeedUsers(){
    int count=0;
    if(count>0){
        return;
    }
    else{
        string email="jujusafadinha@outlook.com.br";
        _context.Add(new User{LoginEmail=email});  
        await _context.SaveChangesAsync();  
    }
}

但它不断给我以下错误：

System.TypeLoadException: 来自 >assembly 'MySql.Data.EntityFrameworkCore, Version=8.0.22.0, Culture=neutral, >PublicKeyToken=c5687fc88969c44d' 的类型 'MySql.Data.EntityFrameworkCore.Query.Internal.MySQLSqlTranslatingExpressionVisitorFactory' 中的方法 'Create'有一个实现。在 MySql.Data.EntityFrameworkCore.Extensions.MySQLServiceCollectionExtensions.AddEntityFrameworkMySQL(IServ>iceCollection services) 在 MySql.Data.EntityFrameworkCore.Infrastructure.Internal.MySQLOptionsExtension.ApplyServices(IServiceColle>ction services) 在 Microsoft.EntityFrameworkCore.Internal.ServiceProviderCache.ApplyOptionServices(ID) >options, ServiceCollection 服务）在 Microsoft.EntityFrameworkCore.Internal.ServiceProviderCache.<c__DisplayClass4_0.g__BuildServiceProvider|3() 在 Microsoft。2.GetOrAdd(TKey key, Func2 valueFactory) at Microsoft.EntityFrameworkCore.Internal.ServiceProviderCache.GetOrAdd(IDbContextOptions options, >Boolean providerRequired) at Microsoft.EntityFrameworkCore.DbContext.get_InternalServiceProvider() at Microsoft.EntityFrameworkCore.DbContext.get_DbContextDependencies() at Microsoft.EntityFrameworkCore.DbContextChanges[EntryWithout] TEntity](TEntity entity) at Microsoft.EntityFrameworkCore.DbContext.SetEntityState[TEntity](TEntity entity, EntityState >entityState) at Microsoft.EntityFrameworkCore.DbContext.Add[TEntity](TEntity entity) at contatinApi.Data.SeedData.SeedUsers()在 D:\dev\contatinapi\Data\SeedData.cs:line 24 at System.Threading.Tasks.Task.<>c.b__139_1(Object state) at System.Threading.QueueUserWorkItemCallback.<>c.<.cctor>b__6_0 (QueueUserWorkItemCallback …