static async Task TestAsync() { try { var adapter = new SqlAdapter { ConnectionString = connectionString }; var book = new Book { IsbnCode = "4774180947", Title = "C#プログラマーのための 基礎からわかるLINQマジック!" }; await adapter.InsertAsync(book); await adapter.DeleteAsync(book); await adapter.CreateAsync <Author>(); await adapter.CreateAsync <Writing>(); await adapter.DropAsync <Author>(); await adapter.DropAsync <Writing>(); } catch (Exception ex) { Console.WriteLine($"エラー: {ex.Message}"); } }