Cast an IEnumerable to an IEnumerable(T)

It's possible to use LINQ queries to get data from an IEnumerable<T>. But for an IEnumerable, you can't use LINQ. If you write this LINQ query for an IEnumerable:

IEnumerable ienumerable = new int[] { 1, 5, 6, 7, 8, 11, 10, 134, 90 };

var integer = from i in ienumerable where i > 10 select i;

Then, you get this error: Could not find an implementation of the query pattern for source type 'System.Collections.IEnumerable'. 'Where' not found. Consider explicitly specifying the type of the range variable 'i'.  

In this tip, I tell you how to cast an IEnumerable to an IEnumerable<T>.

Cast an IEnumerable to an IEnumerable<T>

To cast an IEnumerable to an IEnumerable<T>, you can use this code:

IEnumerable ienumerable = new int[] { 1, 5, 6, 7, 8, 11, 10, 134, 90 };

IEnumerable casted = ienumerable.Cast<int>(); // change 'int' into the type of the elements in your IEnumerable

...

...

IEnumerable ienumerable = new object[] { 1, 5, 6, 7, 8, 11, 10, 134, 90, "test" };

IEnumerable<int> allIntegers = ienumerable.OfType<int>(); // change 'int' in the type of the elements you want to get from the IEnumerable

Read more: Codeproject

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