要通过当前用户更改数据库运行时,可以使用Asp.Net Core 2.2提供的依赖注入功能和配置选项。
首先,在Startup.cs文件的ConfigureServices方法中注册数据库上下文:
services.AddDbContext(options =>
options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));
接下来,在appsettings.json文件中配置数据库连接字符串:
"ConnectionStrings": {
"DefaultConnection": "Data Source=(localdb)\\MSSQLLocalDB;Initial Catalog=YourDatabase;Integrated Security=True;Connect Timeout=30;Encrypt=False;TrustServerCertificate=False;ApplicationIntent=ReadWrite;MultiSubnetFailover=False"
}
然后,创建一个类来表示当前用户,例如:
public class CurrentUser
{
public string UserId { get; set; }
// 其他用户属性
}
接下来,在Startup.cs文件的ConfigureServices方法中注册CurrentUser类:
services.AddScoped(serviceProvider =>
{
var httpContextAccessor = serviceProvider.GetRequiredService();
var userId = httpContextAccessor.HttpContext.User.FindFirst(ClaimTypes.NameIdentifier)?.Value;
// 如果需要其他用户属性,可以在这里获取并设置
return new CurrentUser { UserId = userId };
});
然后,在ApplicationDbContext类中使用CurrentUser类,例如:
public class ApplicationDbContext : DbContext
{
private readonly CurrentUser _currentUser;
public ApplicationDbContext(DbContextOptions options, CurrentUser currentUser)
: base(options)
{
_currentUser = currentUser;
}
public DbSet YourEntities { get; set; }
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
base.OnModelCreating(modelBuilder);
// 设置当前用户作为默认值
modelBuilder.Entity()
.Property(e => e.CreatedBy)
.HasDefaultValueSql($"'{_currentUser.UserId}'");
}
}
最后,在使用数据库上下文的地方,可以通过依赖注入获取当前用户的实例,例如:
public class YourService
{
private readonly ApplicationDbContext _dbContext;
private readonly CurrentUser _currentUser;
public YourService(ApplicationDbContext dbContext, CurrentUser currentUser)
{
_dbContext = dbContext;
_currentUser = currentUser;
}
public void DoSomething()
{
// 使用当前用户ID进行操作
var entity = new YourEntity { CreatedBy = _currentUser.UserId };
_dbContext.YourEntities.Add(entity);
_dbContext.SaveChanges();
}
}
通过以上步骤,您可以在Asp.Net Core 2.2中通过当前用户更改数据库运行时。请根据您的实际需求修改代码示例。