{"id":3175,"date":"2017-04-06T06:00:32","date_gmt":"2017-04-06T13:00:32","guid":{"rendered":"https:\/\/www.couchbase.com\/blog\/?p=3175"},"modified":"2025-06-13T20:57:09","modified_gmt":"2025-06-14T03:57:09","slug":"csharp-tuples-new-csharp-7-feature","status":"publish","type":"post","link":"https:\/\/www.couchbase.com\/blog\/pt\/csharp-tuples-new-csharp-7-feature\/","title":{"rendered":"Tuplas do C#: Novo recurso de linguagem do C# 7"},"content":{"rendered":"
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As tuplas do C# s\u00e3o um novo recurso do C# 7. Vou lhe mostrar os conceitos b\u00e1sicos de como as tuplas do C# funcionam. Tamb\u00e9m vou misturar um pouco de Couchbase para mostrar as tuplas em a\u00e7\u00e3o. No entanto, se voc\u00ea n\u00e3o quiser instalar o Couchbase<\/a> apenas para brincar com tuplas, n\u00e3o se preocupe, voc\u00ea ainda poder\u00e1 acompanhar o processo.<\/p>\n<\/div>\n

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O O c\u00f3digo-fonte que usei para esta postagem do blog est\u00e1 dispon\u00edvel no GitHub<\/a> para voc\u00ea experimentar, se quiser.<\/p>\n<\/div>\n

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Observa\u00e7\u00e3o: Se voc\u00ea estiver usando o C# h\u00e1 algum tempo, talvez se lembre do Classe Tuple que foi introduzida no .NET 4<\/a>. Essa classe ainda existe, mas n\u00e3o \u00e9 a mesma coisa que o novo recurso de tupla do C#.<\/em><\/p>\n<\/div>\n

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O que s\u00e3o tuplas C#?<\/h2>\n
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Uma \"tupla\" \u00e9 o nome de um conceito matem\u00e1tico que \u00e9 apenas uma lista de elementos. Na fam\u00edlia de linguagens LISP, a codifica\u00e7\u00e3o \u00e9 constru\u00edda quase que inteiramente em torno da ideia de que tudo \u00e9 uma lista. Mais uma vez, o C# pega emprestado o n\u00facleo de uma ideia do mundo da programa\u00e7\u00e3o funcional e o integra em uma linguagem n\u00e3o funcional. Assim, temos as tuplas do C# (confira o Proposta original da tupla C# por Mads Torgersen<\/a> para obter mais detalhes e informa\u00e7\u00f5es b\u00e1sicas).<\/p>\n<\/div>\n

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Lembra-se dos tipos an\u00f4nimos?<\/h3>\n
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Mas, para simplificar, vamos considerar algo com o qual voc\u00ea j\u00e1 deve estar familiarizado no C#, um tipo an\u00f4nimo. Em resumo, voc\u00ea pode instanciar um novo objeto sem especificar um tipo:<\/p>\n<\/div>\n

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var myObject = new { Foo = \"bar\", Baz = 123 };<\/code><\/pre>\n<\/div>\n<\/div>\n
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Nos bastidores, h\u00e1 de fato \u00e9<\/em> um tipo que herda da base Objeto<\/code> mas, de modo geral, lidamos apenas com o objeto, n\u00e3o com seu tipo.<\/p>\n<\/div>\n
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Al\u00e9m disso, n\u00e3o posso retornar um tipo an\u00f4nimo de um m\u00e9todo ou passar um tipo an\u00f4nimo como par\u00e2metro sem perder as informa\u00e7\u00f5es de tipo no processo.<\/p>\n<\/div>\n
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private object GetAnonymousObject()\r\n{\r\n    return new {Foo = \"bar\", Baz = 123};\r\n}\r\n\r\nprivate void AnotherMethod()\r\n{\r\n    var obj = GetAnonymousObject();\r\n    Console.WriteLine(obj.Foo); \/\/ compiler error :(\r\n}<\/code><\/pre>\n<\/div>\n<\/div>\n
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Eles s\u00e3o \u00fateis, sem d\u00favida, mas geralmente me refiro a eles como an\u00f4nimos objetos<\/em> como eu as uso, por esses motivos.<\/p>\n<\/div>\n<\/div>\n
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O que isso tem a ver com as tuplas C#?<\/h3>\n
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Penso nas tuplas do C# como uma forma de fazer com que o C# retorne tipos an\u00f4nimos, mas com informa\u00e7\u00f5es mais ricas. Elas s\u00e3o uma forma de criar uma \"classe\" em tempo real sem realmente definir uma classe. A sintaxe das tuplas consiste simplesmente em colocar par\u00eanteses em torno de uma lista de tipos e nomes separados por v\u00edrgulas. Um literal de tupla \u00e9 apenas uma lista de literais separados por v\u00edrgula, tamb\u00e9m cercada por par\u00eanteses. Por exemplo:<\/p>\n<\/div>\n
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(string FirstName, string LastName) myTuple = (\"Matt\", \"Groves\");\r\n\r\nConsole.WriteLine(myTuple.FirstName); \/\/ no compiler error :)\r\nConsole.WriteLine(myTuple.LastName);  \/\/ no compiler error :)<\/code><\/pre>\n<\/div>\n<\/div>\n
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Observa\u00e7\u00e3o: No momento, estou preferindo o PascalCase para propriedades de tuplas. N\u00e3o sei se essa \u00e9 a diretriz oficial ou n\u00e3o, mas me parece correta.<\/em><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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Tuplas C# em a\u00e7\u00e3o<\/h2>\n
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Coloquei as tuplas para trabalhar em um aplicativo de console simples que interage com o Couchbase.<\/p>\n<\/div>\n
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Eu criei um Ajudante de balde<\/code> que \u00e9 uma fachada muito simples sobre a classe normal do Couchbase IBucket<\/code>. Essa classe tem dois m\u00e9todos: um para obter um documento por chave e retornar uma tupla, e outro para inserir uma tupla como um documento.<\/p>\n<\/div>\n
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public class BucketHelper\r\n{\r\n    private readonly IBucket _bucket;\r\n\r\n    public BucketHelper(IBucket bucket)\r\n    {\r\n        _bucket = bucket;\r\n    }\r\n\r\n    public (string Key, T obj) GetTuple<T>(string key)\r\n    {\r\n        var doc = _bucket.Get<T>(key);\r\n        return (doc.Id, doc.Value);\r\n    }\r\n\r\n    public void InsertTuple<T>((string Key, T obj) tuple)\r\n    {\r\n        _bucket.Insert(new Document<T>\r\n        {\r\n            Id = tuple.Key,\r\n            Content = tuple.obj\r\n        });\r\n    }\r\n}<\/code><\/pre>\n<\/div>\n<\/div>\n
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Para instanciar esse auxiliar, voc\u00ea s\u00f3 precisa passar um IBucket<\/code> no construtor.<\/p>\n<\/div>\n
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Tuple como um tipo de retorno<\/h3>\n
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Voc\u00ea pode ent\u00e3o usar o GetTuple<\/code> para obter um documento do Couchbase como uma tupla.<\/p>\n<\/div>\n
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var bucketHelper = new BucketHelper(bucket);\r\n\r\n(string key, Film film) fightClub = bucketHelper.GetTuple<Film>(\"film-001\");<\/code><\/pre>\n<\/div>\n<\/div>\n
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A tupla consistir\u00e1 em uma cadeia de caracteres (a chave do documento) e um objeto de qualquer tipo que voc\u00ea especificar. O conte\u00fado do documento \u00e9 JSON e ser\u00e1 serializado em um objeto C# pelo SDK do .NET.<\/p>\n<\/div>\n
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Al\u00e9m disso, observe que o nome das propriedades da tupla n\u00e3o precisa ser igual. Eu usei obj<\/code> em Ajudante de balde<\/code> mas eu usei filme<\/code> quando liguei para GetTuple<\/code>. Os tipos precisam corresponder, \u00e9 claro.<\/p>\n<\/div>\n<\/div>\n
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Tuple como um tipo de par\u00e2metro<\/h3>\n
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Tamb\u00e9m posso fazer o caminho inverso e passar uma tupla como par\u00e2metro para InsertTuple<\/code>.<\/p>\n<\/div>\n
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string key = Guid.NewGuid().ToString();\r\nFilm randomFilm = GenerateRandomFilm();\r\nbucketHelper.InsertTuple((key, randomFilm));<\/code><\/pre>\n<\/div>\n<\/div>\n
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O Gerar filme aleat\u00f3rio<\/code> retorna um Filme<\/code> com alguns valores aleat\u00f3rios (confira o Fonte do GitHub<\/a> para obter detalhes). Uma tupla de (string, filme)<\/code> \u00e9 passado para InsertTuple<\/code>. O SDK do Couchbase .NET faz isso e insere um documento com a chave\/valor apropriado.<\/p>\n<\/div>\n
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Ao executar o aplicativo do console, voc\u00ea deve obter um resultado parecido com este:<\/p>\n<\/div>\n
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\"C#<\/span><\/p>\n<\/div>\n
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Observe que, no momento, o SDK do Couchbase .NET n\u00e3o tem nenhum suporte direto a tuplas e talvez nunca precise dele. Esse c\u00f3digo serve apenas para ajudar a demonstrar as tuplas C#. Eu n\u00e3o recomendaria o uso do BucketHelper como est\u00e1 na produ\u00e7\u00e3o.<\/em><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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TUH-ple ou TOO-ple?<\/h2>\n
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Parece que me lembro de meu(s) professor(es) pronunciando-o como \"TOO-ple\", ent\u00e3o \u00e9 isso que eu uso. Assim como o debate hard-G \/ soft-G de \"GIF\", tenho certeza de que h\u00e1 pessoas que acham que esse debate \u00e9 da maior import\u00e2ncia e est\u00e3o convencidas de que sua pron\u00fancia \u00e9 a \u00fanica verdadeira. Mas, ambos s\u00e3o aceit\u00e1veis<\/a>.<\/p>\n<\/div>\n
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Se voc\u00ea tiver d\u00favidas sobre tuplas, terei prazer em ajudar. Voc\u00ea tamb\u00e9m pode entrar em contato comigo em Twitter @mgroves<\/a> ou envie-me um e-mail matthew.groves@couchbase.com<\/a>.<\/p>\n<\/div>\n
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Se voc\u00ea tiver d\u00favidas sobre o SDK do Couchbase .NET que usei nesta postagem, pergunte na se\u00e7\u00e3o F\u00f3runs do Couchbase .NET<\/a>. Confira tamb\u00e9m o Portal do desenvolvedor do Couchbase<\/a> para obter mais informa\u00e7\u00f5es sobre o .NET SDK e o Couchbase em geral.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"
C# tuples are a new feature of C# 7. I\u2019m going to show you the basics of how C# tuples work. I\u2019m also going to mix in a little Couchbase to show tuples in action. However, if you don\u2019t want […]<\/p>","protected":false},"author":71,"featured_media":3176,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[1811,10127,1816],"tags":[],"ppma_author":[8937],"class_list":["post-3175","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-dotnet","category-c-sharp","category-couchbase-server"],"acf":[],"yoast_head":"\nC# Tuples Language Feature | Basics of How C# Tuples Work<\/title>\n<meta name=\"description\" content=\"C# tuples are a new feature of C# 7. 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