How do I overload the square-bracket operator in C

Question

DataGridView  for example  lets you do this   DataGridView dgv        DataGridViewCell cell   dgv 1 5     but for the life of me I can t find the documentation on the index square-bracket operator   What do they call it   Where is it implemented   Can it throw   How can I do the same thing in my own classes   ETA  Thanks for all the quick answers   Briefly  the relevant documentation is under the  Item  property  the way to overload is by declaring a property like public object this int x  int y   get       set         the indexer for DataGridView does not throw  at least according to the documentation   It doesn t mention what happens if you supply invalid coordinates   ETA Again  OK  even though the documentation makes no mention of it  naughty Microsoft    it turns out that the indexer for DataGridView will in fact throw an ArgumentOutOfRangeException if you supply it with invalid coordinates   Fair warning

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Operators                           Overloadability     -            amp       lt  lt    gt  gt          All C  binary operators can be overloaded      -             --  true  false    All C  unary operators can be overloaded            lt    gt    lt      gt                 All relational operators can be overloaded                                       but only as pairs    amp  amp                       They can t be overloaded      Conversion operator         They can t be overloaded      -                               These compound assignment operators can be                                      overloaded  But in C   these operators are                                     automatically overloaded when the respective                                     binary operator is overloaded              - gt   new  is  as  sizeof  These operators can t be overloaded                                      Can be overloaded but not always    Source of the information  For bracket   public Object this int index         BUT  The array indexing operator cannot be overloaded  however  types can define indexers  properties that take one or more parameters  Indexer parameters are enclosed in square brackets  just like array indices  but indexer parameters can be declared to be of any type  unlike array indices  which must be integral    From MSDN

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you can find how to do it here   In short it is   public object this int i        get   return InnerList i         set   InnerList i    value        If you only need a getter the syntax in answer below can be used as well  starting from C  6

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Operators                           Overloadability     -            amp       lt  lt    gt  gt          All C  binary operators can be overloaded      -             --  true  false    All C  unary operators can be overloaded            lt    gt    lt      gt                 All relational operators can be overloaded                                       but only as pairs    amp  amp                       They can t be overloaded      Conversion operator         They can t be overloaded      -                               These compound assignment operators can be                                      overloaded  But in C   these operators are                                     automatically overloaded when the respective                                     binary operator is overloaded              - gt   new  is  as  sizeof  These operators can t be overloaded                                      Can be overloaded but not always    Source of the information  For bracket   public Object this int index         BUT  The array indexing operator cannot be overloaded  however  types can define indexers  properties that take one or more parameters  Indexer parameters are enclosed in square brackets  just like array indices  but indexer parameters can be declared to be of any type  unlike array indices  which must be integral    From MSDN

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That would be the item property  http   msdn microsoft com en-us library 0ebtbkkc aspx  Maybe something like this would work   public T Item int index  int y           Then do whatever you need to return set here      get  set

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If you re using C  6 or later  you can use expression-bodied syntax for get-only indexer   public object this int i    gt  this InnerList i

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public class CustomCollection   List lt Object gt        public Object this int index

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For CLI C    compiled with  clr  see this MSDN link   In short  a property can be given the name  default    ref class Class    public    property System  String  default int i          System  String  get int i    return  hello world

User · Answer

For CLI C    compiled with  clr  see this MSDN link   In short  a property can be given the name  default    ref class Class    public    property System  String  default int i          System  String  get int i    return  hello world

User · Answer

If you re using C  6 or later  you can use expression-bodied syntax for get-only indexer   public object this int i    gt  this InnerList i

User · Answer

Here is an example returning a value from an internal List object  Should give you the idea     public object this int index           get   return   List index            set   List index    value

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If you mean the array indexer   You overload that just by writing an indexer property   And you can overload   write as many as you want   indexer properties as long as each one has a different parameter signature  public class EmployeeCollection  List lt Employee gt        public Employee this int employeeId                   get                         foreach var emp in this                                if  emp EmployeeId    employeeId                      return emp                             return null                       public Employee this string employeeName                   get                         foreach var emp in this                                if  emp Name    employeeName                      return emp                             return null

User · Answer

public class CustomCollection   List lt Object gt        public Object this int index

User · Answer

Operators                           Overloadability     -            amp       lt  lt    gt  gt          All C  binary operators can be overloaded      -             --  true  false    All C  unary operators can be overloaded            lt    gt    lt      gt                 All relational operators can be overloaded                                       but only as pairs    amp  amp                       They can t be overloaded      Conversion operator         They can t be overloaded      -                               These compound assignment operators can be                                      overloaded  But in C   these operators are                                     automatically overloaded when the respective                                     binary operator is overloaded              - gt   new  is  as  sizeof  These operators can t be overloaded                                      Can be overloaded but not always    Source of the information  For bracket   public Object this int index         BUT  The array indexing operator cannot be overloaded  however  types can define indexers  properties that take one or more parameters  Indexer parameters are enclosed in square brackets  just like array indices  but indexer parameters can be declared to be of any type  unlike array indices  which must be integral    From MSDN

User · Answer

For CLI C    compiled with  clr  see this MSDN link   In short  a property can be given the name  default    ref class Class    public    property System  String  default int i          System  String  get int i    return  hello world

User · Answer

Here is an example returning a value from an internal List object  Should give you the idea     public object this int index           get   return   List index            set   List index    value

User · Answer

If you mean the array indexer   You overload that just by writing an indexer property   And you can overload   write as many as you want   indexer properties as long as each one has a different parameter signature  public class EmployeeCollection  List lt Employee gt        public Employee this int employeeId                   get                         foreach var emp in this                                if  emp EmployeeId    employeeId                      return emp                             return null                       public Employee this string employeeName                   get                         foreach var emp in this                                if  emp Name    employeeName                      return emp                             return null

User · Answer

For CLI C    compiled with  clr  see this MSDN link   In short  a property can be given the name  default    ref class Class    public    property System  String  default int i          System  String  get int i    return  hello world

User · Answer

Operators                           Overloadability     -            amp       lt  lt    gt  gt          All C  binary operators can be overloaded      -             --  true  false    All C  unary operators can be overloaded            lt    gt    lt      gt                 All relational operators can be overloaded                                       but only as pairs    amp  amp                       They can t be overloaded      Conversion operator         They can t be overloaded      -                               These compound assignment operators can be                                      overloaded  But in C   these operators are                                     automatically overloaded when the respective                                     binary operator is overloaded              - gt   new  is  as  sizeof  These operators can t be overloaded                                      Can be overloaded but not always    Source of the information  For bracket   public Object this int index         BUT  The array indexing operator cannot be overloaded  however  types can define indexers  properties that take one or more parameters  Indexer parameters are enclosed in square brackets  just like array indices  but indexer parameters can be declared to be of any type  unlike array indices  which must be integral    From MSDN

User · Answer

If you mean the array indexer   You overload that just by writing an indexer property   And you can overload   write as many as you want   indexer properties as long as each one has a different parameter signature  public class EmployeeCollection  List lt Employee gt        public Employee this int employeeId                   get                         foreach var emp in this                                if  emp EmployeeId    employeeId                      return emp                             return null                       public Employee this string employeeName                   get                         foreach var emp in this                                if  emp Name    employeeName                      return emp                             return null

User · Answer

you can find how to do it here   In short it is   public object this int i        get   return InnerList i         set   InnerList i    value        If you only need a getter the syntax in answer below can be used as well  starting from C  6

User · Answer

Here is an example returning a value from an internal List object  Should give you the idea     public object this int index           get   return   List index            set   List index    value

User · Answer

you can find how to do it here   In short it is   public object this int i        get   return InnerList i         set   InnerList i    value        If you only need a getter the syntax in answer below can be used as well  starting from C  6

User · Answer

public class CustomCollection   List lt Object gt        public Object this int index

User · Answer

Here is an example returning a value from an internal List object  Should give you the idea     public object this int index           get   return   List index            set   List index    value

User · Answer

That would be the item property  http   msdn microsoft com en-us library 0ebtbkkc aspx  Maybe something like this would work   public T Item int index  int y           Then do whatever you need to return set here      get  set

User · Answer

public class CustomCollection   List lt Object gt        public Object this int index

User · Answer

That would be the item property  http   msdn microsoft com en-us library 0ebtbkkc aspx  Maybe something like this would work   public T Item int index  int y           Then do whatever you need to return set here      get  set

User · Answer

That would be the item property  http   msdn microsoft com en-us library 0ebtbkkc aspx  Maybe something like this would work   public T Item int index  int y           Then do whatever you need to return set here      get  set

User · Answer

If you mean the array indexer   You overload that just by writing an indexer property   And you can overload   write as many as you want   indexer properties as long as each one has a different parameter signature  public class EmployeeCollection  List lt Employee gt        public Employee this int employeeId                   get                         foreach var emp in this                                if  emp EmployeeId    employeeId                      return emp                             return null                       public Employee this string employeeName                   get                         foreach var emp in this                                if  emp Name    employeeName                      return emp                             return null

User · Answer

you can find how to do it here   In short it is   public object this int i        get   return InnerList i         set   InnerList i    value        If you only need a getter the syntax in answer below can be used as well  starting from C  6

[c#] How do I overload the square-bracket operator in C#?

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