Get Max value from List myType

Question

I have List List lt MyType gt   my type contains Age and RandomID  Now I want to find the maximum age from this list   What is the simplest and most efficient way

User · Answer

thelist Max e   gt  e age

User · Answer

How about this way   List lt int gt  myList   new List lt int gt    1  2  3  4     or any other type myList Sort    int greatestValue   myList  myList Count - 1      You basically let the Sort   method to do the job for you instead of writing your own method  Unless you don t want to sort your collection

User · Answer

Simplest is actually just Age Max    you don t need any more code

User · Answer

Easiest way is to use System Linq as previously described  using System Linq   public int GetHighestValue List lt MyTypes gt  list        return list Count  gt  0   list Max t   gt  t Age    0    could also return -1     This is also possible with a Dictionary  using System Linq   public int GetHighestValue Dictionary lt MyTypes  OtherType gt  obj        return obj Count  gt  0   obj Max t   gt  t Key Age    0    could also return -1

User · Answer

Assuming you have access to LINQ  and Age is an int  you may also try var maxAge - it is more likely to compile    int maxAge   myTypes Max t   gt  t Age     If you also need the RandomID  or the whole object   a quick solution is to use MaxBy from MoreLinq  MyType oldest   myTypes MaxBy t   gt  t Age

User · Answer

var maxAge   list Max x   gt  x Age

User · Answer

Okay  so if you don t have LINQ  you could hard-code it   public int FindMaxAge List lt MyType gt  list        if  list Count    0                throw new InvalidOperationException  Empty list              int maxAge   int MinValue      foreach  MyType type in list                if  type Age  gt  maxAge                        maxAge   type Age                      return maxAge      Or you could write a more general version  reusable across lots of list types   public int FindMaxValue lt T gt  List lt T gt  list  Converter lt T  int gt  projection        if  list Count    0                throw new InvalidOperationException  Empty list              int maxValue   int MinValue      foreach  T item in list                int value   projection item           if  value  gt  maxValue                        maxValue   value                      return maxValue      You can use this with      C  2 int maxAge   FindMaxValue list  delegate MyType x    return x Age          C  3 int maxAge   FindMaxValue list  x   gt  x Age     Or you could use LINQBridge     In each case  you can return the if block with a simple call to Math Max if you want  For example   foreach  T item in list        maxValue   Math Max maxValue  projection item

User · Answer

int max   myList Max r   gt  r Age     http   msdn microsoft com en-us library system linq enumerable max aspx

[list] Get Max value from List<myType>

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