Fastest Convert from Collection to List T

Question

What I d like to avoid    ManagementClass m   new ManagementClass  Win32 LogicalDisk     ManagementObjectCollection managementObjects   m GetInstances     List lt ManagementObject gt  managementList   new List lt ManagementObject gt      foreach ManagementObject m in managementObjects        managementList Add m        Isn t there a way to get that collection into a List that looks something like    List lt ManagementObject gt  managementList   new List lt ManagementObjec gt  collection array

User · Answer

managementObjects Cast lt ManagementBaseObject gt    ToList    is a good choice   You could improve performance by pre-initialising the list capacity        public static class Helpers               public static List lt T gt  CollectionToList lt T gt  this System Collections ICollection other                        var output   new List lt T gt  other Count                output AddRange other Cast lt T gt                   return output

User · Answer

As long as ManagementObjectCollection implements IEnumerable lt ManagementObject gt  you can do   List lt ManagementObject gt  managementList   new List lt ManagementObjec gt  managementObjects     If it doesn t  then you are stuck doing it the way that you are doing it

User · Answer

What version of the framework  With 3 5 you could presumably use   List lt ManagementObject gt  managementList   managementObjects Cast lt ManagementObject gt    ToList       edited to remove simpler version  I checked and ManagementObjectCollection only implements the non-generic IEnumerable form

User · Answer

You could try   List lt ManagementObject gt  managementList   new List lt ManagementObject gt  managementObjects ToArray       Not sure if  ToArray   is available for the collection  If you do use the code you posted  make sure you initialize the List with the number of existing elements   List lt ManagementObject gt  managementList   new List lt ManagementObject gt  managementObjects Count       or  Length

User · Answer

As long as ManagementObjectCollection implements IEnumerable lt ManagementObject gt  you can do   List lt ManagementObject gt  managementList   new List lt ManagementObjec gt  managementObjects     If it doesn t  then you are stuck doing it the way that you are doing it

User · Answer

You could try   List lt ManagementObject gt  managementList   new List lt ManagementObject gt  managementObjects ToArray       Not sure if  ToArray   is available for the collection  If you do use the code you posted  make sure you initialize the List with the number of existing elements   List lt ManagementObject gt  managementList   new List lt ManagementObject gt  managementObjects Count       or  Length

User · Answer

You could use  using System Linq    That will give you a ToList lt   extension method for ICollection lt

User · Answer

What version of the framework  With 3 5 you could presumably use   List lt ManagementObject gt  managementList   managementObjects Cast lt ManagementObject gt    ToList       edited to remove simpler version  I checked and ManagementObjectCollection only implements the non-generic IEnumerable form

User · Answer

Since 3 5  anything inherited from System Collection IEnumerable has the convenient extension method OfType available   If your collection is from ICollection or IEnumerable  you can just do this   List lt ManagementObject gt  managementList   ManagementObjectCollection OfType lt ManagementObject gt    ToList      Can t find any way simpler

User · Answer

managementObjects Cast lt ManagementBaseObject gt    ToList    is a good choice   You could improve performance by pre-initialising the list capacity        public static class Helpers               public static List lt T gt  CollectionToList lt T gt  this System Collections ICollection other                        var output   new List lt T gt  other Count                output AddRange other Cast lt T gt                   return output

User · Answer

you can convert like below code snippet  Collection lt A gt  obj new Collection lt return ListRetunAPI   gt

User · Answer

You could try   List lt ManagementObject gt  managementList   new List lt ManagementObject gt  managementObjects ToArray       Not sure if  ToArray   is available for the collection  If you do use the code you posted  make sure you initialize the List with the number of existing elements   List lt ManagementObject gt  managementList   new List lt ManagementObject gt  managementObjects Count       or  Length

User · Answer

You could try   List lt ManagementObject gt  managementList   new List lt ManagementObject gt  managementObjects ToArray       Not sure if  ToArray   is available for the collection  If you do use the code you posted  make sure you initialize the List with the number of existing elements   List lt ManagementObject gt  managementList   new List lt ManagementObject gt  managementObjects Count       or  Length

User · Answer

managementObjects Cast lt ManagementBaseObject gt    ToList    is a good choice   You could improve performance by pre-initialising the list capacity        public static class Helpers               public static List lt T gt  CollectionToList lt T gt  this System Collections ICollection other                        var output   new List lt T gt  other Count                output AddRange other Cast lt T gt                   return output

User · Answer

As long as ManagementObjectCollection implements IEnumerable lt ManagementObject gt  you can do   List lt ManagementObject gt  managementList   new List lt ManagementObjec gt  managementObjects     If it doesn t  then you are stuck doing it the way that you are doing it

User · Answer

Since 3 5  anything inherited from System Collection IEnumerable has the convenient extension method OfType available   If your collection is from ICollection or IEnumerable  you can just do this   List lt ManagementObject gt  managementList   ManagementObjectCollection OfType lt ManagementObject gt    ToList      Can t find any way simpler

User · Answer

What version of the framework  With 3 5 you could presumably use   List lt ManagementObject gt  managementList   managementObjects Cast lt ManagementObject gt    ToList       edited to remove simpler version  I checked and ManagementObjectCollection only implements the non-generic IEnumerable form

User · Answer

As long as ManagementObjectCollection implements IEnumerable lt ManagementObject gt  you can do   List lt ManagementObject gt  managementList   new List lt ManagementObjec gt  managementObjects     If it doesn t  then you are stuck doing it the way that you are doing it

User · Answer

You could use  using System Linq    That will give you a ToList lt   extension method for ICollection lt

User · Answer

you can convert like below code snippet  Collection lt A gt  obj new Collection lt return ListRetunAPI   gt

User · Answer

managementObjects Cast lt ManagementBaseObject gt    ToList    is a good choice   You could improve performance by pre-initialising the list capacity        public static class Helpers               public static List lt T gt  CollectionToList lt T gt  this System Collections ICollection other                        var output   new List lt T gt  other Count                output AddRange other Cast lt T gt                   return output

User · Answer

What version of the framework  With 3 5 you could presumably use   List lt ManagementObject gt  managementList   managementObjects Cast lt ManagementObject gt    ToList       edited to remove simpler version  I checked and ManagementObjectCollection only implements the non-generic IEnumerable form

[c#] Fastest Convert from Collection to List<T>

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