问EF Core 2使用OUTPUT参数执行存储过程

EN

public async Task AddAsync(Models.Filename entity)
{
    SqlParameter name = new SqlParameter("@Name", entity.Name);
    SqlParameter idOut = new SqlParameter
    {
        ParameterName = "@Id",
        SqlDbType = System.Data.SqlDbType.BigInt,
        Direction = System.Data.ParameterDirection.Output
    };
    using (var db = new MetaDataDbContext())
    {
        await db.Database.ExecuteSqlCommandAsync("[dbo].[AddFilename] @Name, @Id", name, idOut);
    }
    entity.Id = Convert.ToInt64(idOut.Value);
}