问题描述
包管理器控制台图像 1
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我将开始项目作为 Sample.API 和默认项目作为 DataRepository\SampleApplicationDatabase。我正在尝试添加 通过给出这样的命令进行迁移:Add-Migration addtable -Context SampleApplicationContext"
它抛出如下错误“无法创建'SampleApplicationContext'类型的对象。添加一个实现 'IDesignTimeDbContextFactory' 到项目,或查看 https://go.microsoft.com/fwlink/?linkid=851728 额外 设计时支持的模式。 mypackagemanagerconsole"
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Sample.Api 应用设置
{
"SampleApplicationConnectionstring": {
"ConnectionString": "Server=TEKFRIDAY281;Database=SampleApplication;User ID=sa;Password=friday123!;Trusted_Connection=True;MultipleActiveResultSets=true;Integrated Security=false"
},"Logging": {
"LogLevel": {
"Default": "information","Microsoft": "Warning","Microsoft.Hosting.Lifetime": "information"
}
},"AllowedHosts": "*"
}
Sample.Api 的启动
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using API_Interface;
using DataAccessLayer;
using IRepository;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.HttpsPolicy;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using Repository;
using SampleApplicationDatabase;
namespace Sample.API
{
public class Startup
{
public Startup(IConfiguration configuration)
{
Configuration = configuration;
}
public IConfiguration Configuration { get; }
// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
services.AddTransient<IData,Data>();
services.AddTransient<IUnitOfWork,UnitOfWork>();
services.AddControllers();
services.AddMvc();
services.AddDbContext<SampleApplicationContext>(options => options.UsesqlServer(Configuration.GetConnectionString("ConnectionString")));
}
// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app,IWebHostEnvironment env)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
app.UseHttpsRedirection();
app.UseRouting();
app.UseAuthorization();
app.UseEndpoints(endpoints =>
{
endpoints.MapControllers();
});
}
}
}
DataRepository 中的 SampleApplicationContext.cs 文件
using Microsoft.EntityFrameworkCore;
using SampleApplicationModels;
using System;
using System.Linq;
namespace SampleApplicationDatabase
{
public class SampleApplicationContext:DbContext
{
public SampleApplicationContext(DbContextOptions<SampleApplicationContext> options) : base(options)
{
}
public DbSet<AdminCredentials> AdminCredentials { get; set; }
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
foreach (var relationship in modelBuilder.Model.GetEntityTypes().SelectMany(e => e.GetForeignKeys()))
{
relationship.DeleteBehavior = DeleteBehavior.Restrict;
}
base.OnModelCreating(modelBuilder);
}
}
}
解决方法
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