Best way to convert IList or IEnumerable to Array

Question

I have a HQL query that can generate either an IList of results  or an IEnumerable of results    However  I want it to return an array of the Entity that I m selecting  what would be the best way of accomplishing that  I can either enumerate through it and build the array  or use CopyTo   a defined array   Is there any better way  I went with the CopyTo-approach

User · Answer

In case you don t have Linq  I solved it the following way       private T   GetArray lt T gt  IList lt T gt  iList  where T  new                 var result   new T iList Count            iList CopyTo result  0            return result          Hope it helps

User · Answer

I feel like reinventing the wheel     public static T   ConvertToArray lt T gt  this IEnumerable lt T gt  enumerable        if  enumerable    null          throw new ArgumentNullException  enumerable         return enumerable as T      enumerable ToArray

User · Answer

Which version of  NET are you using   If it s  NET 3 5  I d just call ToArray   and be done with it   If you only have a non-generic IEnumerable  do something like this   IEnumerable query        MyEntityType   array   query Cast lt MyEntityType gt    ToArray      If you don t know the type within that method but the method s callers do know it  make the method generic and try this   public static void T   PerformQuery lt T gt          IEnumerable query            T   array   query Cast lt T gt    ToArray        return array

User · Answer

In case you don t have Linq  I solved it the following way       private T   GetArray lt T gt  IList lt T gt  iList  where T  new                 var result   new T iList Count            iList CopyTo result  0            return result          Hope it helps

User · Answer

Put the following in your  cs file   using System Linq    You will then be able to use the following extension method from System Linq Enumerable   public static TSource   ToArray lt TSource gt  this System Collections Generic IEnumerable lt TSource gt  source    I e   IEnumerable lt object gt  query        object   bob   query ToArray

User · Answer

Put the following in your  cs file   using System Linq    You will then be able to use the following extension method from System Linq Enumerable   public static TSource   ToArray lt TSource gt  this System Collections Generic IEnumerable lt TSource gt  source    I e   IEnumerable lt object gt  query        object   bob   query ToArray

User · Answer

Which version of  NET are you using   If it s  NET 3 5  I d just call ToArray   and be done with it   If you only have a non-generic IEnumerable  do something like this   IEnumerable query        MyEntityType   array   query Cast lt MyEntityType gt    ToArray      If you don t know the type within that method but the method s callers do know it  make the method generic and try this   public static void T   PerformQuery lt T gt          IEnumerable query            T   array   query Cast lt T gt    ToArray        return array

User · Answer

Which version of  NET are you using   If it s  NET 3 5  I d just call ToArray   and be done with it   If you only have a non-generic IEnumerable  do something like this   IEnumerable query        MyEntityType   array   query Cast lt MyEntityType gt    ToArray      If you don t know the type within that method but the method s callers do know it  make the method generic and try this   public static void T   PerformQuery lt T gt          IEnumerable query            T   array   query Cast lt T gt    ToArray        return array

User · Answer

Which version of  NET are you using   If it s  NET 3 5  I d just call ToArray   and be done with it   If you only have a non-generic IEnumerable  do something like this   IEnumerable query        MyEntityType   array   query Cast lt MyEntityType gt    ToArray      If you don t know the type within that method but the method s callers do know it  make the method generic and try this   public static void T   PerformQuery lt T gt          IEnumerable query            T   array   query Cast lt T gt    ToArray        return array

User · Answer

I feel like reinventing the wheel     public static T   ConvertToArray lt T gt  this IEnumerable lt T gt  enumerable        if  enumerable    null          throw new ArgumentNullException  enumerable         return enumerable as T      enumerable ToArray

[c#] Best way to convert IList or IEnumerable to Array

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