Tanzim Saqib on .NET discovery

LINQ: Iterate through collection which implements IEnumerable only

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• Author: Tanzim Saqib
• October 13, 2007
• Category: LINQ

The following works fine in LINQ, because an array implements IEnumerable <T>.

string[] tokenArray = new string[2] { “Hello”, “World” };
var tokens = from token in tokenList select token;              

foreach (var item in tokens)
    Console.WriteLine(item);

But, the collections which do not implement IEnumerable<T> or IQueryable, can not be iterated in LINQ in the same way. To achieve the same, make use of a simple casting trick such as:

ArrayList tokenList = new ArrayList();
tokenList.Add(“Hello”);
tokenList.Add(“World”);              

var tokens = from string token in tokenList select token;              

foreach (var item in tokens)
    Console.WriteLine(item);

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