System.Tuples<\/pre>\nnamespace supports Tuple class in C#.<\/p>\n<\/div>\n
The purpose of a tuple is to create a way to return multiple values from a function.<\/p>\n
class TupleExample\r\n {\r\n static void Main()\r\n {\r\n \/\/ Create three-item tuple.\r\n Tuple<int, string, bool> tuple =\r\n new Tuple<int, string, bool>(10, \"csharpstar\", true);\r\n \/\/ Access tuple properties.\r\n if (tuple.Item1 == 10)\r\n {\r\n Console.WriteLine(tuple.Item1);\r\n }\r\n if (tuple.Item2 == \"easywcf\")\r\n {\r\n Console.WriteLine(tuple.Item2);\r\n }\r\n if (tuple.Item3)\r\n {\r\n Console.WriteLine(tuple.Item3);\r\n }\r\n }\r\n }<\/pre>\n\u00c7?kt?:<\/p>\n
10
\nTrue<\/p>\n<\/p>\n
Tuple.Create method :<\/h3>\n
class TupleExample\r\n {\r\n static void Main()\r\n {\r\n \/\/ Use Tuple.Create static method.\r\n var tuple = Tuple.Create(\"Csharpstar\", 10, true);\r\n \r\n \/\/ Test value of string.\r\n string value = tuple.Item1;\r\n if (value == \"csharpstar\")\r\n {\r\n Console.WriteLine(true);\r\n }\r\n \r\n \/\/ Test Item2 and Item3.\r\n Console.WriteLine(tuple.Item2 == 10);\r\n Console.WriteLine(!tuple.Item3);\r\n \r\n \/\/ Write string representation.\r\n Console.WriteLine(tuple);\r\n }\r\n }<\/pre>\n\u00c7?kt?:<\/p>\n
true
\ntrue
\nfalse
\n<Csharpstar”, 10, true><\/p>\nTuple that returns multiple values in C#:<\/h3>\n
class TupleExample\r\n {\r\n static Tuple<string, int> NameAndId()\r\n {\r\n \/\/ This method returns multiple values.\r\n return new Tuple<string, int>(\"Csharpstar\", 10);\r\n }\r\n \r\n static void Main(string[] args)\r\n {\r\n var result = NameAndId();\r\n string name = result.Item1;\r\n int id = result.Item2;\r\n \/\/ Display the multiple values returned.\r\n Console.WriteLine(name);\r\n Console.WriteLine(id);\r\n }\r\n }<\/pre>\n\u00c7?kt?:<\/p>\n
Csharpstar
\n<\/span>10<\/span><\/div>\n<\/div>\n\nWhen to use Tuples in C#?<\/h3>\n
Tuples are commonly used in four ways:<\/p>\n
\n
- To represent a single set of data. For example, a tuple can represent a database record, and its components can represent individual fields of the record.<\/li>\n
- To provide easy access to, and manipulation of, a data set.<\/li>\n
- To return multiple values from a method without using out parameters<\/li>\n
- To pass multiple values to a method through a single parameter. For example, the Thread.Start(Object) method has a single parameter that lets you supply one value to the method that the thread executes at startup time. If you supply a Tuple object as the method argument, you can supply the thread\u2019s startup routine with three items of data.<\/li>\n<\/ul>\n
Issues on Tuple Class:<\/h3>\n
Member Names:<\/h4>\n
The main problem with Tuple class is it\u2019s Member Names. It does not have any Semantic meaning.
\nIf you see a return type of Tuple that doesn\u2019t really tell you anything.
\nSo it is difficult to understand and maintain the code. It would be far more useful if the return type were something like Tuple<\/p>\n
![\"C#7](\"http:\/\/www.csharpstar.com\/wp-content\/uploads\/2016\/03\/csharp7_1.jpg\")
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