DataSeeder

首先是实现IDataSeedContributor接口，此类型会自动加到AbpDataOptions的Contributors的列表

    public interface IDataSeedContributor
    {
        Task SeedAsync(DataSeedContext context);
    }

IDataSeeder利用Contributors，逐个取出实例化进行执行，其中DataSeedContext是TenantId和自定义的Dictionary<string, object> Properties

扩展一个SeedAsync方法tenantId，如果在多租户的环境，注意要带上

 public static Task SeedAsync(this IDataSeeder seeder, Guid? tenantId = null)
        {
            return seeder.SeedAsync(new DataSeedContext(tenantId));
        }

ABP应用框架增加了两个方法，分别是用户和角色，以及权限 

Volo.Abp.PermissionManagement

IPermissionDataSeeder

public virtual Task SeedAsync(DataSeedContext context)
        {
            var multiTenancySide = CurrentTenant.GetMultiTenancySide();
            var permissionNames = PermissionDefinitionManager
                .GetPermissions()
                .Where(p => p.MultiTenancySide.HasFlag(multiTenancySide))
                .Select(p => p.Name)
                .ToArray();

            return PermissionDataSeeder.SeedAsync(
                RolePermissionValueProvider.ProviderName,
                "admin",
                permissionNames,
                context.TenantId
            );
        }

2、IIdentityDataSeeder

Volo.Abp.Identity 

 public Task SeedAsync(DataSeedContext context)
        {
            return _identityDataSeeder.SeedAsync(
                context["AdminEmail"] as string ?? "admin@abp.io",
                context["AdminPassword"] as string ?? "1q2w3E*",
                context.TenantId
            );
        }