C# Mac OSX、ASP.NET和mySQL-密钥长度错误

我对ASP.Net非常陌生，我正在尝试编写一个基本的应用程序，以便在web浏览器中显示MySQL数据库中的一些数据

我认为我试图创建的实体的主键被标记为太大。当我查看连接到的数据库时，我可以看到一个新的模式出现。如果我再次点击run，页面将被加载，但是在第一次运行时（在创建模式之前），我得到了一个错误，我已经在这个问题的底部包含了这个错误

如果在下面的代码中，我取消对entity.HasKey行的注释，并添加一行以将属性更改为适当的大小，则会出现相同的错误

尝试在模型上放置[Key]会产生相同的错误

using System;
using Microsoft.EntityFrameworkCore;
using Microsoft.AspNetCore.Identity.EntityFrameworkCore;
using aspNet_Sep_3_b.Models;
using aspNet_Sep_3_b;

namespace aspNet_Sep_3_b.DAL
{
    public class mysqlContext : IdentityDbContext<ApplicationUser> //iddbcontext of type appuser
    {
        public virtual DbSet<Person> Person { get; set; }

        public mysqlContext(DbContextOptions<mysqlContext> options) :base(options)
        {
            this.Database.EnsureCreated();//Any time we run this project, we need to create the database. So any time we change the database, we'll need to drop it, and create it with a new structure.

        }

        public mysqlContext()
        {
            this.Database.EnsureCreated();
        }

        protected override void OnModelCreating(ModelBuilder builder) //What is this?
        {
            base.OnModelCreating(builder);
            builder.Entity<ApplicationUser>().Property(u => u.Id).HasMaxLength(36);

            builder.Entity<Person>(entity =>
            {

                entity.Property(e => e.PersonId).HasColumnType("SMALLINT");
                //entity.HasKey(e => e.PersonId);
                entity.Property(e => e.PersonName).IsRequired().HasMaxLength(36);


            });



            //builder.Entity<Person>().Property(e => e.PersonID).HasMaxLength(36);
            //builder.Entity<Person>().Property(e => e.PersonName).HasMaxLength(36);

        }

        //Program myProgram = new Program();
    }
}

使用系统；
使用Microsoft.EntityFrameworkCore；
使用Microsoft.AspNetCore.Identity.EntityFrameworkCore；
使用aspNet_Sep_3_b.模型；
使用aspNet_Sep_3_b；
名称空间aspNet_Sep_3_b.DAL
{
公共类mysqlContext:IdentityDbContext//appuser类型的iddbcontext
{
公共虚拟数据库集Person{get；set；}
公共mysqlContext（DbContextOptions）：基本（选项）
{
this.Database.EnsureCreated（）；//无论何时运行此项目，都需要创建数据库。因此，无论何时更改数据库，都需要删除它，并使用新结构创建它。
}
公共mysqlContext（）
{
this.Database.recreated（）；
}
模型创建时受保护的覆盖无效（ModelBuilder）//这是什么？
{
基于模型创建（生成器）；
builder.Entity（）.Property（u=>u.Id）.HasMaxLength（36）；
builder.Entity（Entity=>
{
entity.Property（e=>e.PersonId）.HasColumnType（“SMALLINT”）；
//entity.HasKey（e=>e.PersonId）；
entity.Property（e=>e.PersonName）.IsRequired（）.HasMaxLength（36）；
});
//builder.Entity（）.Property（e=>e.PersonID）.HasMaxLength（36）；
//builder.Entity（）.Property（e=>e.PersonName）.HasMaxLength（36）；
}
//程序myProgram=新程序（）；
}
}

错误：

    MySqlException: Specified key was too long; max key length is 3072 bytes

MySql.Data.MySqlClient.MySqlStream.ReadPacket()
MySql.Data.MySqlClient.NativeDriver.GetResult(ref int affectedRow, ref long insertedId)
MySql.Data.MySqlClient.Driver.NextResult(int statementId, bool force)
MySql.Data.MySqlClient.MySqlDataReader.NextResult()
MySql.Data.MySqlClient.MySqlCommand.ExecuteReader(CommandBehavior behavior)
MySql.Data.MySqlClient.MySqlCommand.ExecuteNonQuery()
Microsoft.EntityFrameworkCore.Storage.Internal.RelationalCommand.Execute(IRelationalConnection connection, DbCommandMethod executeMethod, IReadOnlyDictionary<string, object> parameterValues)
Microsoft.EntityFrameworkCore.Storage.Internal.RelationalCommand.ExecuteNonQuery(IRelationalConnection connection, IReadOnlyDictionary<string, object> parameterValues)
Microsoft.EntityFrameworkCore.Migrations.MigrationCommand.ExecuteNonQuery(IRelationalConnection connection, IReadOnlyDictionary<string, object> parameterValues)
Microsoft.EntityFrameworkCore.Migrations.Internal.MigrationCommandExecutor.ExecuteNonQuery(IEnumerable<MigrationCommand> migrationCommands, IRelationalConnection connection)
Microsoft.EntityFrameworkCore.Storage.RelationalDatabaseCreator.CreateTables()
Microsoft.EntityFrameworkCore.Storage.RelationalDatabaseCreator.EnsureCreated()
Microsoft.EntityFrameworkCore.Infrastructure.DatabaseFacade.EnsureCreated()
aspNet_Sep_3_b.DAL.mysqlContext..ctor(DbContextOptions<mysqlContext> options) in mysqlContext.cs

                this.Database.EnsureCreated();//Any time we run this project, we need to create the database. So any time we change the database, we'll need to drop it, and create it with a new structure.

Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitConstructor(ConstructorCallSite constructorCallSite, ServiceProviderEngineScope scope)
Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor<TArgument, TResult>.VisitCallSite(IServiceCallSite callSite, TArgument argument)
Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitScoped(ScopedCallSite scopedCallSite, ServiceProviderEngineScope scope)
Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor<TArgument, TResult>.VisitCallSite(IServiceCallSite callSite, TArgument argument)
Microsoft.Extensions.DependencyInjection.ServiceLookup.DynamicServiceProviderEngine+<>c__DisplayClass1_0.<RealizeService>b__0(ServiceProviderEngineScope scope)
Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngine.GetService(Type serviceType, ServiceProviderEngineScope serviceProviderEngineScope)
Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngineScope.GetService(Type serviceType)
Microsoft.Extensions.DependencyInjection.ActivatorUtilities.GetService(IServiceProvider sp, Type type, Type requiredBy, bool isDefaultParameterRequired)
lambda_method(Closure , IServiceProvider , object[] )
Microsoft.AspNetCore.Mvc.Controllers.ControllerActivatorProvider+<>c__DisplayClass4_0.<CreateActivator>b__0(ControllerContext controllerContext)
Microsoft.AspNetCore.Mvc.Controllers.ControllerFactoryProvider+<>c__DisplayClass5_0.<CreateControllerFactory>g__CreateController|0(ControllerContext controllerContext)
Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Next(ref State next, ref Scope scope, ref object state, ref bool isCompleted)
Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.InvokeInnerFilterAsync()
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeNextResourceFilter()
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Rethrow(ResourceExecutedContext context)
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Next(ref State next, ref Scope scope, ref object state, ref bool isCompleted)
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeFilterPipelineAsync()
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeAsync()
Microsoft.AspNetCore.Routing.EndpointMiddleware.Invoke(HttpContext httpContext)
Microsoft.AspNetCore.Routing.EndpointRoutingMiddleware.Invoke(HttpContext httpContext)
Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
Microsoft.AspNetCore.StaticFiles.StaticFileMiddleware.Invoke(HttpContext context)
Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)

MySqlException:指定的密钥太长；最大密钥长度为3072字节
MySql.Data.MySqlClient.MySqlStream.ReadPacket（）
MySql.Data.MySqlClient.NativeDriver.GetResult（ref int affectedRow，ref long insertedId）
MySql.Data.MySqlClient.Driver.NextResult（int statementId，bool force）
MySql.Data.MySqlClient.MySqlDataReader.NextResult（）
MySql.Data.MySqlClient.MySqlCommand.ExecuteReader（CommandBehavior）
MySql.Data.MySqlClient.MySqlCommand.ExecuteNonQuery（）
Microsoft.EntityFrameworkCore.Storage.Internal.RelationalCommand.Execute（IRelationalConnection连接、DbCommandMethod executeMethod、iRadonlyDictionary参数值）
Microsoft.EntityFrameworkCore.Storage.Internal.RelationalCommand.ExecuteOnQuery（IRelationalConnection连接，iRelationalDYDictionary参数值）
Microsoft.EntityFrameworkCore.Migrations.MigrationCommand.ExecuteOnQuery（IRelationalConnection连接，IReadOnlyDictionary参数值）
Microsoft.EntityFrameworkCore.Migrations.Internal.MigrationCommandExecutor.ExecutionQuery（IEnumerable migrationCommands，IRelationalConnection）
Microsoft.EntityFrameworkCore.Storage.RelationalDatabaseCreator.CreateTables（）
Microsoft.EntityFrameworkCore.Storage.RelationalDatabaseCreator.EnsureCreated（）
Microsoft.EntityFrameworkCore.Infrastructure.DatabaseFacade.Rescreated（）文件
mysqlContext.cs中的aspNet_Sep_3_b.DAL.mysqlContext..ctor（DbContextOptions选项）
this.Database.recreated（）//任何时候我们运行这个项目，我们都需要创建数据库。因此，每当我们更改数据库时，我们都需要删除它，并使用新结构创建它。
Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitConstructor（ConstructorCallSite ConstructorCallSite，ServiceProviderEngineScope作用域）
Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor.VisitCallSite（IServiceCallSite callSite，Target参数）
Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitScoped（ScopedCallSite ScopedCallSite，ServiceProviderEngineScope作用域）
Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor.VisitCallSite（IServiceCallSite callSite，Target参数）
Microsoft.Extensions.DependencyInjection.ServiceLookup.DynamicServiceProviderEngine+c\u DisplayClass1\u 0.b\u 0（ServiceProviderEngineScope作用域）
Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngine.GetService（类型serviceType，ServiceProviderEngineScope ServiceProviderEngineScope）
Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngineScope.GetService（类型serviceType）
Microsoft.Extensions.DependencyInjection.ActivatorUtilities.GetService（IServiceProvider sp，类型类型，类型requiredBy，bool isDefaultParameterRequired）
lambda_方法（闭包、IServiceProvider、对象[]）
Microsoft.AspNetCore.Mvc.Controllers.ControllerActivatorProvider+c__显示类4_0.b__0（ControllerContext ControllerContext）
Microsoft.AspNetCore.Mvc.Controllers.ControllerFactoryProvider+c_uuuDisplayClass5_0.g_uuCreateController | 0（ControllerContext ControllerContext）
Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Next（ref状态Next、ref范围、ref对象状态、ref bool已完成）
Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.InvokeInnerFilterAsync（）
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeNextResourceFilter（）
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Rethrow（ResourceExecutedContext）
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Next（ref State Next、ref Scope Scope、ref object State、ref bool isCompleted）
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeFilterPipelineAsync（）
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeAsync（）
Microsoft.AspNetCore.Routing.EndpointMiddleware.Invoke（H
builder.Entity<ApplicationUser>(entity => entity.Property
                    (p => p.Id).HasMaxLength(128));
            builder.Entity<ApplicationUser>(entity => entity.Property
                    (p => p.NormalizedEmail).HasMaxLength(128));
            builder.Entity<ApplicationUser>(entity => entity.Property
                    (p => p.NormalizedUserName).HasMaxLength(128));

            builder.Entity<IdentityRole>(entity => entity.Property
                    (p => p.Id).HasMaxLength(128));
            builder.Entity<IdentityRole>(entity => entity.Property
                    (p => p.NormalizedName).HasMaxLength(128));

            builder.Entity<IdentityUserToken<string>>(entity => entity.Property
                    (p => p.LoginProvider).HasMaxLength(128));
            builder.Entity<IdentityUserToken<string>>(entity => entity.Property
                    (p => p.UserId).HasMaxLength(128));
            builder.Entity<IdentityUserToken<string>>(entity => entity.Property
                    (p => p.Name).HasMaxLength(128));

            builder.Entity<IdentityUserRole<string>>(entity => entity.Property
                    (p => p.UserId).HasMaxLength(128));
            builder.Entity<IdentityUserRole<string>>(entity => entity.Property
                    (p => p.RoleId).HasMaxLength(128));


            builder.Entity<IdentityUserLogin<string>>(entity => entity.Property
                    (p => p.LoginProvider).HasMaxLength(128));
            builder.Entity<IdentityUserLogin<string>>(entity => entity.Property
                    (p => p.ProviderKey).HasMaxLength(128));
            builder.Entity<IdentityUserLogin<string>>(entity => entity.Property
                    (p => p.UserId).HasMaxLength(128));

            builder.Entity<IdentityUserClaim<string>>(entity => entity.Property
                    (p => p.Id).HasMaxLength(128));
            builder.Entity<IdentityUserClaim<string>>(entity => entity.Property
                    (p => p.UserId).HasMaxLength(128));

            builder.Entity<IdentityRoleClaim<string>>(entity => entity.Property
                    (p => p.Id).HasMaxLength(128));
            builder.Entity<IdentityRoleClaim<string>>(entity => entity.Property
                    (p => p.RoleId).HasMaxLength(128));