Better naming in Tuple classes than Item1 Item2

Question

Is there a way to use a Tuple class  but supply the names of the items in it   For example   public Tuple lt int  int  int int gt  GetOrderRelatedIds     That returns the ids for OrderGroupId  OrderTypeId  OrderSubTypeId and OrderRequirementId   It would be nice to let the users of my method know which is which    When you call the method  the results are result Item1  result Item2  result Item3  result Item4   It is not clear which one is which     I know I could just create a class to hold all these Ids  but it these Ids already have their own classes they live in and making a class for this one method s return value seems silly

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double  int  t1    4 5  3   Console WriteLine   quot Tuple with elements  t1 Item1  and  t1 Item2   quot       Output     Tuple with elements 4 5 and 3    double Sum  int Count  t2    4 5  3   Console WriteLine   quot Sum of  t2 Count  elements is  t2 Sum   quot       Output     Sum of 3 elements is 4 5  From Docs https   docs microsoft com en-us dotnet csharp language-reference builtin-types value-tuples

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No  you can t name the tuple members   The in-between would be to use ExpandoObject instead of Tuple

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I would write the Item names in the summay   so by hovering over the function helloworld   the text will say hello   Item1 and world   Item2     helloworld  Hi1 Hi2          lt summary gt      Return hello   Item1 and world Item2      lt  summary gt       lt param name  input  gt string to split lt  param gt       lt returns gt  lt  returns gt  private static Tuple lt bool  bool gt  helloworld string input        bool hello   false      bool world   false      foreach  var hw in input Split                     switch  hw                        case  Hi1                   hello  true                  break              case  Hi2                   world  true                  break                       return new Tuple lt bool  bool gt  hello  world

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Just to add to  MichaelMocko answer  Tuples have couple of gotchas at the moment  You can t use them in EF expression trees Example  public static  string name  string surname  GetPersonName this PersonContext ctx  int id        return ctx Persons          Where person   gt  person Id    id             Selecting as Tuple          Select person   gt   person Name  person Surname            First       This will fail to compile with  quot An expression tree may not contain a tuple literal quot  error  Unfortunately  the expression trees API wasn t expanded with support for tuples when these were added to the language  Track  and upvote  this issue for the updates  https   github com dotnet roslyn issues 12897 To get around the problem  you can cast it to anonymous type first and then convert the value to tuple     Will work public static  string name  string surname  GetPersonName this PersonContext ctx  int id        return ctx Persons          Where person   gt  person Id    id           Select person   gt  new   person Name  person Surname             ToList            Select person   gt   person Name  person Surname            First       Another option is to use ValueTuple Create     Will work public static  string name  string surname  GetPersonName this PersonContext ctx  int id        return ctx Persons          Where person   gt  person Id    id           Select person   gt  ValueTuple Create person Name  person Surname            First        References   https   www damirscorner com blog posts 20181207-NoSupportForTuplesInExpressionTrees html  Convert anonymous type to new C  7 tuple type   You can t deconstruct them in lambdas There s a proposal to add the support  https   github com dotnet csharplang issues 258 Example  public static IQueryable lt  string name  string surname  gt  GetPersonName this PersonContext ctx  int id        return ctx Persons          Where person   gt  person Id    id           Select person   gt  ValueTuple Create person Name  person Surname          This won t work ctx GetPersonName id  Select  name  surname    gt    return name   surname         But this will ctx GetPersonName id  Select t   gt    return t name   t surname      References   C  7 tuples and lambdas  They won t serialize nicely using System  using Newtonsoft Json   public class Program       public static void Main             var me    age  21  favoriteFood   quot Custard quot            string json   JsonConvert SerializeObject me               Will output   quot Item1 quot  21  quot Item2 quot   quot Custard quot           Console WriteLine json             Tuple field names are only available at compile time and are completely wiped out at runtime  References   Make Value Tuple property names resolvable at runtime  CSharpLang   C 7 Tuple Support  Newtonsoft Json

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This is very annoying and I expect future versions of C  will address this need  I find the easiest work around to be either use a different data structure type or rename the  items  for your sanity and for the sanity of others reading your code   Tuple lt ApiResource  JSendResponseStatus gt  result   await SendApiRequest    ApiResource apiResource   result Item1  JSendResponseStatus jSendStatus   result Item2

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C  7 tuple example  var tuple   TupleExample key  value         private  string key1  long value1  ValidateAPIKeyOwnerId string key  string value                                return  key  value                       if   string IsNullOrEmpty tuple key1   amp  amp  tuple value1  gt  0                                    your code

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Here is an overly complicated version of what you are asking   class MyTuple   Tuple lt int  int gt        public MyTuple int one  int two           base one  two                    public int OrderGroupId   get  return this Item1          public int OrderTypeId   get  return this Item2           Why not just make a class

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Up to C  7 0  there was no way to do this short of defining your own type

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You Can write a class that contains the Tuple   You need to override the Equals and GetHashCode functions  and the    and    operators   class Program       public class MyTuple               private Tuple lt int  int gt  t           public MyTuple int a  int b                        t   new Tuple lt int  int gt  a  b                      public int A                       get                               return t Item1                                   public int B                       get                               return t Item2                                   public override bool Equals object obj                        return t Equals   MyTuple obj  t                      public override int GetHashCode                         return t GetHashCode                       public static bool operator    MyTuple m1  MyTuple m2                        return m1 Equals m2                      public static bool operator    MyTuple m1  MyTuple m2                        return  m1 Equals m2                        static void Main string   args                var v1   new MyTuple 1  2           var v2   new MyTuple 1  2            Console WriteLine v1    v2            Dictionary lt MyTuple  int gt  d   new Dictionary lt MyTuple  int gt             d Add v1  1            Console WriteLine d ContainsKey v2              will return   True  True

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MichaelMocko Answered is great  but I want to add a few things which I had to figure out  string first  string middle  string last  LookupName long id   above Line will give you compile-time error if you are using  net framework  lt  4 7 So if you have a project that is using  net framework  lt  4 7 and still you want to use ValueTuple than workAround would be installing this NuGet package Update  Example of returning Named tuple from a method and using it public static  string extension  string fileName  GetFile         return   quot png quot    quot test quot       Using it var  extension  fileName    GetFile     Console WriteLine extension   Console WriteLine fileName

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I think I would create a class but another alternative is output parameters   public void GetOrderRelatedIds out int OrderGroupId  out int OrderTypeId  out int OrderSubTypeId  out int OrderRequirementId    Since your Tuple only contains integers you could represent it with a Dictionary lt string int gt   var orderIds   new Dictionary lt string  int gt          OrderGroupId   1         OrderTypeId   2         OrderSubTypeId   3         OrderRequirementId   4        but I don t recommend that either

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Why is everyone making life so hard  Tuples are for rather temporary data processing  Working with Tuples all the time will make the code very hard to understand at some point  Creating classes for everything could eventually bloat your project   It s about balance  however     Your problem seems to be something you would want a class for  And just for the sake of completeness  this class below also contains constructors     This is the proper pattern for   A custom data type   with no further functionality  Getters and setters can also be expanded with code  getting setting private members with the name pattern of   orderGroupId   while also executing functional code   Including constructors  You can also choose to include just one constructor if all properties are mandatory  If you want to use all constructors  bubbling like this is the proper pattern to avoid duplicate code      public class OrderRelatedIds       public int OrderGroupId   get  set        public int OrderTypeId   get  set        public int OrderSubTypeId   get  set        public int OrderRequirementId   get  set         public OrderRelatedIds                   public OrderRelatedIds int orderGroupId            this                 OrderGroupId   orderGroupId            public OrderRelatedIds int orderGroupId  int orderTypeId            this orderGroupId                OrderTypeId   orderTypeId            public OrderRelatedIds int orderGroupId  int orderTypeId  int orderSubTypeId            this orderGroupId  orderTypeId                OrderSubTypeId   orderSubTypeId            public OrderRelatedIds int orderGroupId  int orderTypeId  int orderSubTypeId  int orderRequirementId            this orderGroupId  orderTypeId  orderSubTypeId                OrderRequirementId   orderRequirementId            Or  if you want it really simple  You can also use type initializers   OrderRelatedIds orders   new OrderRelatedIds       OrderGroupId   1      OrderTypeId   2      OrderSubTypeId   3      OrderRequirementId   4     public class OrderRelatedIds       public int OrderGroupId      public int OrderTypeId      public int OrderSubTypeId      public int OrderRequirementId

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Reproducing my answer from this post as it is a better fit here   Starting C  v7 0  now it is possible to name the tuple properties which earlier used to default to predefined names like Item1  Item2 and so on   Naming the properties of Tuple Literals   var myDetails    MyName   RBT Yoga   MyAge  22  MyFavoriteFood   Dosa    Console WriteLine   Name -  myDetails MyName   Age -  myDetails MyAge   Passion -  myDetails MyFavoriteFood       The output on console      Name - RBT Yoga  Age - 22  Passion - Dosa   Returning Tuple  having named properties  from a method   static void Main string   args        var empInfo   GetEmpInfo        Console WriteLine   Employee Details   empInfo firstName    empInfo lastName    empInfo computerName    empInfo Salary        static  string firstName  string lastName  string computerName  int Salary  GetEmpInfo           This is hardcoded just for the demonstration  Ideally this data might be coming from some DB or web service call     return   Rasik    Bihari    Rasik-PC   1000       The output on console      Employee Details  Rasik  Bihari  Rasik-PC  1000   Creating a list of Tuples having named properties  var tupleList   new List lt  int Index  string Name  gt         1   cow         5   chickens         1   airplane       foreach  var tuple in tupleList      Console WriteLine    tuple Index  -  tuple Name       Output on console      1 - cow    5 - chickens    1 - airplane   I hope I ve covered everything  In case  there is anything which I ve missed then please give me a feedback in comments   Note  My code snippets are using string interpolation feature of C  v7 as detailed here

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If the types of your items are all different  here is a class I made to get them more intuitively   The usage of this class   var t   TypedTuple Create  hello   1  new MyClass     var s   t Get lt string gt     var i   t Get lt int gt     var c   t Get lt MyClass gt       Source code   public static class TypedTuple       public static TypedTuple lt T1 gt  Create lt T1 gt  T1 t1                return new TypedTuple lt T1 gt  t1              public static TypedTuple lt T1  T2 gt  Create lt T1  T2 gt  T1 t1  T2 t2                return new TypedTuple lt T1  T2 gt  t1  t2              public static TypedTuple lt T1  T2  T3 gt  Create lt T1  T2  T3 gt  T1 t1  T2 t2  T3 t3                return new TypedTuple lt T1  T2  T3 gt  t1  t2  t3              public static TypedTuple lt T1  T2  T3  T4 gt  Create lt T1  T2  T3  T4 gt  T1 t1  T2 t2  T3 t3  T4 t4                return new TypedTuple lt T1  T2  T3  T4 gt  t1  t2  t3  t4              public static TypedTuple lt T1  T2  T3  T4  T5 gt  Create lt T1  T2  T3  T4  T5 gt  T1 t1  T2 t2  T3 t3  T4 t4  T5 t5                return new TypedTuple lt T1  T2  T3  T4  T5 gt  t1  t2  t3  t4  t5              public static TypedTuple lt T1  T2  T3  T4  T5  T6 gt  Create lt T1  T2  T3  T4  T5  T6 gt  T1 t1  T2 t2  T3 t3  T4 t4  T5 t5  T6 t6                return new TypedTuple lt T1  T2  T3  T4  T5  T6 gt  t1  t2  t3  t4  t5  t6              public static TypedTuple lt T1  T2  T3  T4  T5  T6  T7 gt  Create lt T1  T2  T3  T4  T5  T6  T7 gt  T1 t1  T2 t2  T3 t3  T4 t4  T5 t5  T6 t6  T7 t7                return new TypedTuple lt T1  T2  T3  T4  T5  T6  T7 gt  t1  t2  t3  t4  t5  t6  t7              public static TypedTuple lt T1  T2  T3  T4  T5  T6  T7  T8 gt  Create lt T1  T2  T3  T4  T5  T6  T7  T8 gt  T1 t1  T2 t2  T3 t3  T4 t4  T5 t5  T6 t6  T7 t7  T8 t8                return new TypedTuple lt T1  T2  T3  T4  T5  T6  T7  T8 gt  t1  t2  t3  t4  t5  t6  t7  t8             public class TypedTuple lt T gt        protected Dictionary lt Type  object gt  items   new Dictionary lt Type  object gt          public TypedTuple T item1                Item1   item1             public TSource Get lt TSource gt                  object value          if  this items TryGetValue typeof TSource   out value                         return  TSource value                    else             return default TSource              private T item1      public T Item1   get   return this item1    set   this item1   value  this items typeof T     value         public class TypedTuple lt T1  T2 gt    TypedTuple lt T1 gt        public TypedTuple T1 item1  T2 item2            base item1                Item2   item2             private T2 item2      public T2 Item2   get   return this item2    set   this item2   value  this items typeof T2     value         public class TypedTuple lt T1  T2  T3 gt    TypedTuple lt T1  T2 gt        public TypedTuple T1 item1  T2 item2  T3 item3            base item1  item2                Item3   item3             private T3 item3      public T3 Item3   get   return this item3    set   this item3   value  this items typeof T3     value         public class TypedTuple lt T1  T2  T3  T4 gt    TypedTuple lt T1  T2  T3 gt        public TypedTuple T1 item1  T2 item2  T3 item3  T4 item4            base item1  item2  item3                Item4   item4             private T4 item4      public T4 Item4   get   return this item4    set   this item4   value  this items typeof T4     value         public class TypedTuple lt T1  T2  T3  T4  T5 gt    TypedTuple lt T1  T2  T3  T4 gt        public TypedTuple T1 item1  T2 item2  T3 item3  T4 item4  T5 item5            base item1  item2  item3  item4                Item5   item5             private T5 item5      public T5 Item5   get   return this item5    set   this item5   value  this items typeof T5     value         public class TypedTuple lt T1  T2  T3  T4  T5  T6 gt    TypedTuple lt T1  T2  T3  T4  T5 gt        public TypedTuple T1 item1  T2 item2  T3 item3  T4 item4  T5 item5  T6 item6            base item1  item2  item3  item4  item5                Item6   item6             private T6 item6      public T6 Item6   get   return this item6    set   this item6   value  this items typeof T6     value         public class TypedTuple lt T1  T2  T3  T4  T5  T6  T7 gt    TypedTuple lt T1  T2  T3  T4  T5  T6 gt        public TypedTuple T1 item1  T2 item2  T3 item3  T4 item4  T5 item5  T6 item6  T7 item7            base item1  item2  item3  item4  item5  item6                Item7   item7             private T7 item7      public T7 Item7   get   return this item7    set   this item7   value  this items typeof T7     value         public class TypedTuple lt T1  T2  T3  T4  T5  T6  T7  T8 gt    TypedTuple lt T1  T2  T3  T4  T5  T6  T7 gt        public TypedTuple T1 item1  T2 item2  T3 item3  T4 item4  T5 item5  T6 item6  T7 item7  T8 item8            base item1  item2  item3  item4  item5  item6  item7                Item8   item8             private T8 item8      public T8 Item8   get   return this item8    set   this item8   value  this items typeof T8     value

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With  net 4 you could perhaps look at the ExpandoObject  however  don t use it for this simple case as what would have been compile-time errors become run-time errors   class Program       static void Main string   args                dynamic employee  manager           employee   new ExpandoObject            employee Name    John Smith           employee Age   33           manager   new ExpandoObject            manager Name    Allison Brown           manager Age   42          manager TeamSize   10           WritePerson manager           WritePerson employee             private static void WritePerson dynamic person                Console WriteLine   0  is  1  years old                              person Name  person Age              The following statement causes an exception            if you pass the employee object             Console WriteLine  Manages  0  people   person TeamSize              This code example produces the following output     John Smith is 33 years old     Allison Brown is 42 years old      Something else worth mentioning is an anonymous type for within a method  but you need to create a class if you want to return it   var MyStuff   new               PropertyName1   10          PropertyName2    string data           PropertyName3   new ComplexType

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In C  7 0  Visual Studio 2017  there is a new construction to do that    string first  string middle  string last  LookupName long id

[c#] Better naming in Tuple classes than "Item1", "Item2"

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