如何从数据库asp.net Core2动态设置IdentityOptions

using Microsoft.AspNetCore.Identity;
using Microsoft.Extensions.Options;

public class CustomIdentityOptionsProvider : IConfigureOptions<IdentityOptions>
{
    private readonly YourDbContext _dbContext;

    public CustomIdentityOptionsProvider(YourDbContext dbContext)
    {
        _dbContext = dbContext;
    }

    public void Configure(IdentityOptions options)
    {
        // 从数据库中获取配置信息
        var identityOptions = _dbContext.IdentityOptions.FirstOrDefault();

        // 设置IdentityOptions的属性
        if (identityOptions != null)
        {
            options.Password.RequireDigit = identityOptions.RequireDigit;
            options.Password.RequireLowercase = identityOptions.RequireLowercase;
            options.Password.RequireNonAlphanumeric = identityOptions.RequireNonAlphanumeric;
            options.Password.RequireUppercase = identityOptions.RequireUppercase;
            options.Password.RequiredLength = identityOptions.RequiredLength;
            options.Password.RequiredUniqueChars = identityOptions.RequiredUniqueChars;
            options.Lockout.DefaultLockoutTimeSpan = TimeSpan.FromMinutes(identityOptions.DefaultLockoutTimeSpanMinutes);
            options.Lockout.MaxFailedAccessAttempts = identityOptions.MaxFailedAccessAttempts;
            options.Lockout.AllowedForNewUsers = identityOptions.AllowedForNewUsers;
            options.User.RequireUniqueEmail = identityOptions.RequireUniqueEmail;
        }
    }
}

services.AddTransient<IConfigureOptions<IdentityOptions>, CustomIdentityOptionsProvider>();

services.AddIdentity<YourUserClass, YourRoleClass>()
    .AddEntityFrameworkStores<YourDbContext>()
    .AddDefaultTokenProviders();

app.UseAuthentication();