How to concatenate two IEnumerable T into a new IEnumerable T

Question

I have two instances of IEnumerable lt T gt   with the same T   I want a new instance of IEnumerable lt T gt  which is the concatenation of both   Is there a build-in method in  Net to do that or do I have to write it myself

User · Accepted Answer

Yes  LINQ to Objects supports this with Enumerable Concat   var together   first Concat second     NB  Should first or second be null you would receive a ArgumentNullException   To avoid this  amp  treat nulls as you would an empty set  use the null coalescing operator like so   var together    first    Enumerable Empty lt string gt     Concat second    Enumerable Empty lt string gt        amending   lt string gt   to the appropriate type

User · Answer

The Concat method will return an object which implements IEnumerable lt T gt  by returning an object  call it Cat  whose enumerator will attempt to use the two passed-in enumerable items  call them A and B  in sequence   If the passed-in enumerables represent sequences which will not change during the lifetime of Cat  and which can be read from without side-effects  then Cat may be used directly   Otherwise  it may be a good idea to call ToList   on Cat and use the resulting List lt T gt   which will represent a snapshot of the contents of A and B    Some enumerables take a snapshot when enumeration begins  and will return data from that snapshot if the collection is modified during enumeration   If B is such an enumerable  then any change to B which occurs before Cat has reached the end of A will show up in Cat s enumeration  but changes which occur after that will not   Such semantics may likely be confusing  taking a snapshot of Cat can avoid such issues

User · Answer

The answer that I was looking for when searching public void Answer         IEnumerable lt YourClass gt  first   this GetFirstIEnumerableList           Assign to empty list so we can use later     IEnumerable lt YourClass gt  second   new List lt YourClass gt          if  IwantToUseSecondList                second   this GetSecondIEnumerableList                IEnumerable lt SchemapassgruppData gt  concatedList   first Concat second

User · Answer

You can use below  code for your solution -  public void Linq94           int   numbersA     0  2  4  5  6  8  9         int   numbersB     1  3  5  7  8          var allNumbers   numbersA Concat numbersB         Console WriteLine  All numbers from both arrays          foreach  var n in allNumbers                  Console WriteLine n

[c#] How to concatenate two IEnumerable<T> into a new IEnumerable<T>?

Examples related to c#

Examples related to .net

Examples related to ienumerable

Examples related to concatenation