List T OrderBy Alphabetical Order

Question

I m using C  on Framework 3 5   I m looking to quickly sort a Generic List lt T gt    For the sake of this example  let s say I have a List of a Person type with a property of lastname   How would I sort this List using a lambda expression   List lt Person gt  people   PopulateList    people OrderBy        gt

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private void SortGridGenerico lt  T  gt             ref List lt  T  gt  lista              SortDirection sort       string propriedadeAOrdenar         if   string IsNullOrEmpty propriedadeAOrdenar       amp  amp  lista    null      amp  amp  lista Count  gt  0                 Type t   lista 0  GetType             if  sort    SortDirection Ascending                         lista   lista OrderBy                  a   gt  t InvokeMember                      propriedadeAOrdenar                       System Reflection BindingFlags GetProperty                       null                       a                       null                                 ToList                      else                       lista   lista OrderByDescending                  a   gt  t InvokeMember                      propriedadeAOrdenar                       System Reflection BindingFlags GetProperty                       null                       a                       null                                 ToList

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you can use linq    using    System linq  var newList   people OrderBy x  gt x Name  ToList

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people OrderBy person   gt  person lastname  ToList

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Do you need the list to be sorted in place  or just an ordered sequence of the contents of the list  The latter is easier   var peopleInOrder   people OrderBy person   gt  person LastName     To sort in place  you d need an IComparer lt Person  or a Comparison lt Person   For that  you may wish to consider ProjectionComparer in MiscUtil    I know I keep bringing MiscUtil up - it just keeps being relevant

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for me this useful dummy guide - Sorting in Generic List -   worked  it helps you to understand 4 ways overloads  to do this job with very complete and clear explanations and simple examples    List Sort    List Sort  Generic Comparison  List Sort  Generic IComparer  List Sort  Int32  Int32  Generic IComparer

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If you mean an in-place sort  i e  the list is updated    people Sort  x  y    gt  string Compare x LastName  y LastName      If you mean a new list   var newList   people OrderBy x  gt x LastName  ToList       ToList optional

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Do you need the list to be sorted in place  or just an ordered sequence of the contents of the list  The latter is easier   var peopleInOrder   people OrderBy person   gt  person LastName     To sort in place  you d need an IComparer lt Person  or a Comparison lt Person   For that  you may wish to consider ProjectionComparer in MiscUtil    I know I keep bringing MiscUtil up - it just keeps being relevant

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You can also use  model People   model People OrderBy x   gt  x Name  ToList

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If you mean an in-place sort  i e  the list is updated    people Sort  x  y    gt  string Compare x LastName  y LastName      If you mean a new list   var newList   people OrderBy x  gt x LastName  ToList       ToList optional

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If you mean an in-place sort  i e  the list is updated    people Sort  x  y    gt  string Compare x LastName  y LastName      If you mean a new list   var newList   people OrderBy x  gt x LastName  ToList       ToList optional

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people OrderBy person   gt  person lastname  ToList

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You can use this code snippet   var New1   EmpList OrderBy z   gt  z Age  ToList      where New1 is a List lt Employee gt    EmpList is variable of a List lt Employee gt    z is a variable of Employee type

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Do you need the list to be sorted in place  or just an ordered sequence of the contents of the list  The latter is easier   var peopleInOrder   people OrderBy person   gt  person LastName     To sort in place  you d need an IComparer lt Person  or a Comparison lt Person   For that  you may wish to consider ProjectionComparer in MiscUtil    I know I keep bringing MiscUtil up - it just keeps being relevant

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you can use linq    using    System linq  var newList   people OrderBy x  gt x Name  ToList

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people OrderBy person   gt  person lastname  ToList

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This is a generic sorter  Called with the switch below   dvm PagePermissions is a property on my ViewModel of type      List T in this case T is a EF6 model class called page permission   dvm UserNameSortDir is a string property on the viewmodel that holds the next sort direction   The one that is actaully used in the view   switch  sortColumn        case  user name           dvm PagePermissions   Sort dvm PagePermissions  p   gt  p user name  ref sortDir           dvm UserNameSortDir   sortDir          break      case  role name           dvm PagePermissions   Sort dvm PagePermissions  p   gt  p role name  ref sortDir           dvm RoleNameSortDir   sortDir          break      case  page name           dvm PagePermissions   Sort dvm PagePermissions  p   gt  p page name  ref sortDir           dvm PageNameSortDir   sortDir          break                       public List lt T gt  Sort lt T TKey gt  List lt T gt  list  Func lt T  TKey gt  sorter  ref string direction                if  direction     asc                         list   list OrderBy sorter  ToList                direction    desc                     else                       list   list OrderByDescending sorter  ToList                direction    asc                     return list

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for me this useful dummy guide - Sorting in Generic List -   worked  it helps you to understand 4 ways overloads  to do this job with very complete and clear explanations and simple examples    List Sort    List Sort  Generic Comparison  List Sort  Generic IComparer  List Sort  Int32  Int32  Generic IComparer

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people OrderBy person   gt  person lastname  ToList

User · Answer

If you mean an in-place sort  i e  the list is updated    people Sort  x  y    gt  string Compare x LastName  y LastName      If you mean a new list   var newList   people OrderBy x  gt x LastName  ToList       ToList optional

User · Answer

This is a generic sorter  Called with the switch below   dvm PagePermissions is a property on my ViewModel of type      List T in this case T is a EF6 model class called page permission   dvm UserNameSortDir is a string property on the viewmodel that holds the next sort direction   The one that is actaully used in the view   switch  sortColumn        case  user name           dvm PagePermissions   Sort dvm PagePermissions  p   gt  p user name  ref sortDir           dvm UserNameSortDir   sortDir          break      case  role name           dvm PagePermissions   Sort dvm PagePermissions  p   gt  p role name  ref sortDir           dvm RoleNameSortDir   sortDir          break      case  page name           dvm PagePermissions   Sort dvm PagePermissions  p   gt  p page name  ref sortDir           dvm PageNameSortDir   sortDir          break                       public List lt T gt  Sort lt T TKey gt  List lt T gt  list  Func lt T  TKey gt  sorter  ref string direction                if  direction     asc                         list   list OrderBy sorter  ToList                direction    desc                     else                       list   list OrderByDescending sorter  ToList                direction    asc                     return list

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You can also use  model People   model People OrderBy x   gt  x Name  ToList

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You can use this code snippet   var New1   EmpList OrderBy z   gt  z Age  ToList      where New1 is a List lt Employee gt    EmpList is variable of a List lt Employee gt    z is a variable of Employee type

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private void SortGridGenerico lt  T  gt             ref List lt  T  gt  lista              SortDirection sort       string propriedadeAOrdenar         if   string IsNullOrEmpty propriedadeAOrdenar       amp  amp  lista    null      amp  amp  lista Count  gt  0                 Type t   lista 0  GetType             if  sort    SortDirection Ascending                         lista   lista OrderBy                  a   gt  t InvokeMember                      propriedadeAOrdenar                       System Reflection BindingFlags GetProperty                       null                       a                       null                                 ToList                      else                       lista   lista OrderByDescending                  a   gt  t InvokeMember                      propriedadeAOrdenar                       System Reflection BindingFlags GetProperty                       null                       a                       null                                 ToList

User · Answer

Do you need the list to be sorted in place  or just an ordered sequence of the contents of the list  The latter is easier   var peopleInOrder   people OrderBy person   gt  person LastName     To sort in place  you d need an IComparer lt Person  or a Comparison lt Person   For that  you may wish to consider ProjectionComparer in MiscUtil    I know I keep bringing MiscUtil up - it just keeps being relevant

[c#] List<T> OrderBy Alphabetical Order

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