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public static T[] ToArray<T>(IEnumerable<T> e) {
return e.ToArray();
}
I get the following compiler error:
Error 1
System.Collections.Generic.IEnumerable<T>does not contain a definition forToArrayand no extension methodToArrayaccepting a first argument of typeSystem.Collections.Generic.IEnumerable<T>could be found (are you missing a using directive or an assembly reference?
But the MSDN reference lists this method. What is wrong here?
825
ToArray might do an additional allocation and copy operation such that the buffer will be sized exactly to the number of elements. In order to confirm this the following benchmark is used. The results confirm that ToList is in most cases 10% - 15% faster.
The IEnumerable<T> interface is central to LINQ. All LINQ methods are extension methods to the IEnumerable<T> interface. That means that you can call any LINQ method on any object that implements IEnumerable<T> .
IEnumerable is an interface defining a single method GetEnumerator() that returns an IEnumerator interface. It is the base interface for all non-generic collections that can be enumerated. This works for read-only access to a collection that implements that IEnumerable can be used with a foreach statement.
IEnumerable in C# is an interface that defines one method, GetEnumerator which returns an IEnumerator interface. This allows readonly access to a collection then a collection that implements IEnumerable can be used with a for-each statement.
Assuming you're on .NET 3.5 or later, you need to add the using directive to the top of your code file:
using System.Linq;
You also need to have an assembly reference to System.Core (although this should be there by default for Visual Studio projects).
151
You're missing using System.Linq; at the top of the file.
ToArray is an extension method implements on IEnumerable<T> as a part of LINQ (Language-Integrated Query), so you have to add that using to make it work.
30
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