Asp.net mvc Can'；t将数据插入我的数据库

我正在学习ASP.NET核心和实体框架的教程，我无法将数据插入数据库。我发现每当我评论这句话：

            DbInitializer.Initialize(context);

应用程序工作正常

该行位于Startup.cs文件中

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using ContosoUniversity.Data;
using Microsoft.EntityFrameworkCore;


namespace ContosoUniversity
{
    public class Startup
    {
        public Startup(IHostingEnvironment env)
        {
            var builder = new ConfigurationBuilder()
                .SetBasePath(env.ContentRootPath)
                .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
                .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true)
                .AddEnvironmentVariables();
            Configuration = builder.Build();
        }

        public IConfigurationRoot Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            // Add framework services.
            services.AddDbContext<SchoolContext>(options => options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));
            services.AddMvc();
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory, SchoolContext context)
        {
            loggerFactory.AddConsole(Configuration.GetSection("Logging"));
            loggerFactory.AddDebug();

            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
                app.UseBrowserLink();
            }
            else
            {
                app.UseExceptionHandler("/Home/Error");
            }

            app.UseStaticFiles();

            app.UseMvc(routes =>
            {
                routes.MapRoute(
                    name: "default",
                    template: "{controller=Home}/{action=Index}/{id?}");
            });
            DbInitializer.Initialize(context);
        }
    }
}

使用系统；
使用System.Collections.Generic；
使用System.Linq；
使用System.Threading.Tasks；
使用Microsoft.AspNetCore.Builder；
使用Microsoft.AspNetCore.Hosting；
使用Microsoft.Extensions.Configuration；
使用Microsoft.Extensions.DependencyInjection；
使用Microsoft.Extensions.Logging；
使用ContosoUniversity.数据；
使用Microsoft.EntityFrameworkCore；
康托索大学
{
公营创业
{
公共启动（IHostingEnvironment环境）
{
var builder=new ConfigurationBuilder（）
.SetBasePath（env.ContentRootPath）
.AddJsonFile（“appsettings.json”，可选：false，reloadOnChange:true）
.AddJsonFile（$“appsettings.{env.EnvironmentName}.json”，可选：true）
.AddenEnvironmentVariables（）；
Configuration=builder.Build（）；
}
公共IConfigurationRoot配置{get；}
//此方法由运行时调用。请使用此方法将服务添加到容器中。
public void配置服务（IServiceCollection服务）
{
//添加框架服务。
services.AddDbContext（options=>options.UseSqlServer（Configuration.GetConnectionString（“DefaultConnection”））；
services.AddMvc（）；
}
//此方法由运行时调用。请使用此方法配置HTTP请求管道。
公共void配置（IApplicationBuilder应用程序、IHostingEnvironment环境、iLogger工厂、学校上下文）
{
loggerFactory.AddConsole（Configuration.GetSection（“Logging”）；
loggerFactory.AddDebug（）；
if（env.IsDevelopment（））
{
app.UseDeveloperExceptionPage（）；
app.UseBrowserLink（）；
}
其他的
{
app.UseExceptionHandler（“/Home/Error”）；
}
app.UseStaticFiles（）；
app.UseMvc（路由=>
{
routes.MapRoute(
名称：“默认”，
模板：“{controller=Home}/{action=Index}/{id？}”）；
});
初始化（上下文）；
}
}
}

这是我启动web应用程序时收到的错误消息

An error occurred while starting the application.

ArgumentException: Keyword not supported: '"server'.
System.Data.Common.DbConnectionOptions.ParseInternal(Dictionary<string, string> parsetable, string connectionString, bool buildChain, Dictionary<string, string> synonyms)

ArgumentException: Keyword not supported: '"server'.
System.Data.Common.DbConnectionOptions.ParseInternal(Dictionary<string, string> parsetable, string connectionString, bool buildChain, Dictionary<string, string> synonyms)
System.Data.Common.DbConnectionOptions..ctor(string connectionString, Dictionary<string, string> synonyms)
System.Data.SqlClient.SqlConnectionString..ctor(string connectionString)
System.Data.SqlClient.SqlConnectionFactory.CreateConnectionOptions(string connectionString, DbConnectionOptions previous)
System.Data.ProviderBase.DbConnectionFactory.GetConnectionPoolGroup(DbConnectionPoolKey key, DbConnectionPoolGroupOptions poolOptions, ref DbConnectionOptions userConnectionOptions)
System.Data.SqlClient.SqlConnection.ConnectionString_Set(DbConnectionPoolKey key)
System.Data.SqlClient.SqlConnection.set_ConnectionString(string value)
Microsoft.EntityFrameworkCore.Storage.Internal.SqlServerConnection.CreateDbConnection()
Microsoft.EntityFrameworkCore.Internal.LazyRef.get_Value()
Microsoft.EntityFrameworkCore.Storage.RelationalConnection.Open()
Microsoft.EntityFrameworkCore.Storage.Internal.SqlServerDatabaseCreator+<>c__DisplayClass11_0.<Exists>b__0(DateTime giveUp)
Microsoft.EntityFrameworkCore.Storage.Internal.SqlServerExecutionStrategy.Execute<TState, TResult>(Func<TState, TResult> operation, Func<TState, ExecutionResult<TResult>> verifySucceeded, TState state)
Microsoft.EntityFrameworkCore.ExecutionStrategyExtensions.Execute<TState, TResult>(IExecutionStrategy strategy, Func<TState, TResult> operation, TState state)
Microsoft.EntityFrameworkCore.Storage.RelationalDatabaseCreator.EnsureCreated()
ContosoUniversity.Data.DbInitializer.Initialize(SchoolContext context) in DbInitializer.cs
-
namespace ContosoUniversity.Data
{
    public static class DbInitializer
    {
        public static void Initialize(SchoolContext context)
        {
            context.Database.EnsureCreated();
            // Look for any students.
            if (context.Students.Any())
            {
                return; // DB has been seeded
            }
            var students = new Student[]
ContosoUniversity.Startup.Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory, SchoolContext context) in Startup.cs
-
            app.UseMvc(routes =>
            {
                routes.MapRoute(
                    name: "default",
                    template: "{controller=Home}/{action=Index}/{id?}");
            });
            DbInitializer.Initialize(context);
        }
    }
}
System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
Microsoft.AspNetCore.Hosting.ConventionBasedStartup.Configure(IApplicationBuilder app)
Microsoft.AspNetCore.Hosting.Internal.WebHost.BuildApplication()

Show raw exception details
System.ArgumentException: Keyword not supported: '"server'.
   at System.Data.Common.DbConnectionOptions.ParseInternal(Dictionary`2 parsetable, String connectionString, Boolean buildChain, Dictionary`2 synonyms)
   at System.Data.Common.DbConnectionOptions..ctor(String connectionString, Dictionary`2 synonyms)
   at System.Data.SqlClient.SqlConnectionString..ctor(String connectionString)
   at System.Data.SqlClient.SqlConnectionFactory.CreateConnectionOptions(String connectionString, DbConnectionOptions previous)
   at System.Data.ProviderBase.DbConnectionFactory.GetConnectionPoolGroup(DbConnectionPoolKey key, DbConnectionPoolGroupOptions poolOptions, DbConnectionOptions& userConnectionOptions)
   at System.Data.SqlClient.SqlConnection.ConnectionString_Set(DbConnectionPoolKey key)
   at System.Data.SqlClient.SqlConnection.set_ConnectionString(String value)
   at Microsoft.EntityFrameworkCore.Storage.Internal.SqlServerConnection.CreateDbConnection()
   at Microsoft.EntityFrameworkCore.Internal.LazyRef`1.get_Value()
   at Microsoft.EntityFrameworkCore.Storage.RelationalConnection.Open()
   at Microsoft.EntityFrameworkCore.Storage.Internal.SqlServerDatabaseCreator.<>c__DisplayClass11_0.<Exists>b__0(DateTime giveUp)
   at Microsoft.EntityFrameworkCore.Storage.Internal.SqlServerExecutionStrategy.Execute[TState,TResult](Func`2 operation, Func`2 verifySucceeded, TState state)
   at Microsoft.EntityFrameworkCore.ExecutionStrategyExtensions.Execute[TState,TResult](IExecutionStrategy strategy, Func`2 operation, TState state)
   at Microsoft.EntityFrameworkCore.Storage.RelationalDatabaseCreator.EnsureCreated()
   at ContosoUniversity.Data.DbInitializer.Initialize(SchoolContext context) in C:\Users\iderlich\OneDrive\Documentos.Kerberos\Practica MVC\VS2017 PC Talca\ContosoUniversity\ContosoUniversity\Data\DbInitializer.cs:line 10
   at ContosoUniversity.Startup.Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory, SchoolContext context) in C:\Users\iderlich\OneDrive\Documentos.Kerberos\Practica MVC\VS2017 PC Talca\ContosoUniversity\ContosoUniversity\Startup.cs:line 62
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at Microsoft.AspNetCore.Hosting.ConventionBasedStartup.Configure(IApplicationBuilder app)
   at Microsoft.AspNetCore.Hosting.Internal.WebHost.BuildApplication()
.NET Core X64 v4.1.1.0    |   Microsoft.AspNetCore.Hosting version 1.1.2    |    Microsoft Windows 6.1.7601 S    |   Need help?

启动应用程序时出错。
ArgumentException:不支持关键字：““服务器”。
System.Data.Common.DbConnectionOptions.ParseInternal（字典解析表、字符串连接字符串、布尔构建链、字典同义词）
ArgumentException:不支持关键字：““服务器”。
System.Data.Common.DbConnectionOptions.ParseInternal（字典解析表、字符串连接字符串、布尔构建链、字典同义词）
System.Data.Common.DbConnectionOptions..ctor（字符串连接字符串，字典同义词）
System.Data.SqlClient.SqlConnectionString..ctor（string connectionString）
System.Data.SqlClient.SqlConnectionFactory.CreateConnectionOptions（string connectionString，DbConnectionOptions previous）
System.Data.ProviderBase.DbConnectionFactory.GetConnectionPoolGroup（DbConnectionPoolKey键、DbConnectionPoolGroupOptions poolOptions、ref DbConnectionOptions userConnectionOptions）
System.Data.SqlClient.SqlConnection.ConnectionString_集（DbConnectionPoolKey）
System.Data.SqlClient.SqlConnection.set\u ConnectionString（字符串值）
Microsoft.EntityFrameworkCore.Storage.Internal.SqlServerConnection.CreatedDBConnection（）
Microsoft.EntityFrameworkCore.Internal.LazyRef.get_Value（）
Microsoft.EntityFrameworkCore.Storage.RelationalConnection.Open（）
Microsoft.EntityFrameworkCore.Storage.Internal.SqlServerDatabaseCreator+c__DisplayClass11_0.b__0（日期时间放弃）
Microsoft.EntityFrameworkCore.Storage.Internal.SqlServerExecutionStrategy.Execute（Func操作、Func验证成功、TState状态）
Microsoft.EntityFrameworkCore.ExecutionStrategyExtensions.Execute（IEExecutionStrategy策略、Func操作、TState状态）
Microsoft.EntityFrameworkCore.Storage.RelationalDatabaseCreator.EnsureCreated（）
DbInitializer.cs中的ContosoUniversity.Data.DbInitializer.Initialize（学校上下文上下文）
-
名称空间ContosoUniversity.Data
{
公共静态类DbInitializer
{
公共静态void初始化（学校上下文）
{
context.Database.recreated（）；
//寻找任何学生。
if（context.Students.Any（））
{
return；//数据库已被植入种子
}
var学生=新学生[]
在Startup.cs中配置（IAApplicationBuilder应用程序、IHostingEnvironment环境、ILoggerFactory loggerFactory、SchoolContext上下文）
-
app.UseMvc（路由=>
{
routes.MapRoute(
名称：“默认”，
模板：“{controller=Home}/{action=Index}/{id？}”）；
});
初始化（上下文）；
}
}
}
System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）异常
Microsoft.AspNetCore.Hosting.ConventionBasedStartup.Configure（IApplicationBuilder应用程序）
Microsoft.AspNetCore.Hosting.Internal.WebHost.BuildApplication（）
显示原始异常详细信息
System.ArgumentException:不支持关键字：''server'。
位于System.Data.Common.DbConnectionOptions.ParseInternal（字典'2 parsetable，字符串connectionString，布尔构建链，字典'2同义词）
位于System.Data.Common.DbConnectionOptions..ctor（字符串连接字符串，字典`2同义词）
位于System.Data.SqlClient.SqlConnectionString..ctor（String connectionString）
位于System.Data.SqlClient.SqlConnectionFactory.CreateConnectionOptions（String connectionString，DbConnectionOptions previous）
位于System.Data.ProviderBase.DbConnectio