小编给大家分享一下ASP.NET使用EntityFrameworkCore CodeFrist 的方法，希望大家阅读完这篇文章后大所收获，下面让我们一起去探讨吧！
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1,首先根据个人需要下载对应的微软官方.net core sdk和runtime
2,创建一个asp.net Core的项目
3,创建实体Entity,用户和角色
public class User
{
public int Id { get; set; }
///
/// 角色Id
///
public int RoleId { get; set; }
public virtual Role Role { get; set; }
///
/// 状态
///
public int Status { get; set; }
///
/// 登陆名
///
public string Login { get; set; }
///
/// 登陆密码
///
public string Pwd { get; set; }
} public class Role
{
public int Id { get; set; }
///
/// 角色名
///
public string Name { get; set; }
///
/// 一个角色的多个用户
///
public virtual ICollection Users { get; set; }
} 4，创建DbContext
public class EFDbContext: DbContext
{
public EFDbContext(DbContextOptions options) : base(options)
{ }
public DbSet Roles { get; set; }
public DbSet Users { get; set; }
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
Role(modelBuilder);
User(modelBuilder);
}
private void User(ModelBuilder modelBuilder)
{
var userBuilder = modelBuilder.Entity().ToTable("User");
// Properties
userBuilder.Property(t => t.Id).ValueGeneratedOnAdd();
userBuilder.Property(t => t.RoleId).IsRequired();
userBuilder.Property(t => t.Status).IsRequired();
userBuilder.Property(t => t.Login).IsRequired().HasMaxLength(30);
userBuilder.Property(t => t.Pwd).IsRequired().HasMaxLength(60);
// Primary Key
userBuilder.HasKey(t => t.Id);
// Index
userBuilder.HasIndex(t => t.Login);
// Relationships
userBuilder.HasOne(t => t.Role).WithMany(t => t.Users).HasForeignKey(t => t.RoleId);
}
private void Role(ModelBuilder modelBuilder)
{
var roleBuilder = modelBuilder.Entity().ToTable("Role");
// Properties
roleBuilder.Property(t => t.Id).ValueGeneratedOnAdd();
roleBuilder.Property(t => t.Name).IsRequired().HasMaxLength(30);
// Primary Key
roleBuilder.HasKey(t => t.Id);
}
} 5，创建DbInitializer，用于创建初始数据
public class DbInitializer
{
public async static Task InitData(EFDbContext context)
{
if (context.Database != null && context.Database.EnsureCreated())
{
//角色配置
context.Roles.AddRange(new Role[]
{
new Role { Name="超级管理员" },
new Role { Name="管理员" }
});
//默认用户
context.Users.AddRange(new User[]
{
new User { RoleId=1, Login="administrator", Pwd="111111" },
new User { RoleId=2, Login="admin", Pwd="111111" }
});
await context.SaveChangesAsync();
}
}6，修改Startup类方法
在ConfigureServices添加如下代码
// DbContext services.AddDbContext(options => options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));
在Configure方法内添加
public async void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
{
loggerFactory.AddConsole(Configuration.GetSection("Logging"));
loggerFactory.AddDebug();
app.UseMvc();
await DbInitializer.InitData(app.ApplicationServices.GetService());
} 7，修改appsettings.json
{
"ConnectionStrings": {
"DefaultConnection": "Data Source=.;Initial Catalog=LniceCore;Integrated Security=SSPI;"
},
"Logging": {
"IncludeScopes": false,
"LogLevel": {
"Default": "Debug",
"System": "Information",
"Microsoft": "Information"
}
}
}8，运行程序，查看结果
看完了这篇文章，相信你对ASP.NET使用EntityFrameworkCore CodeFrist 的方法有了一定的了解，想了解更多相关知识，欢迎关注创新互联行业资讯频道，感谢各位的阅读！
