Professional LINQ

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Scott Klein

"Professional LINQ"

ArrayList names = new ArrayList();
names.Add("Alex");
names.Add("Chuck");
names.Add("Dave");
names.Add("Dinesh");
names.Add("Joe");
names.Add("John");
names.Add("Sarah");
74
Chapter 4: LINQ Standard Query Operators
names.Add("Steve");
IEnumerable query = names.Cast().Select(name => name);
foreach (string item in query)
listBox1.Items.Add(item);
OfType
The OfType operator enables you to filter elements of an IEnumerable object based on a specific type. In
the following example, the OfType operator returns only those elements in the sequence that can be cast
to a type of int:
ArrayList names = new ArrayList(7);
names.Add("Scott");
names.Add(1);
names.Add("Dave");
names.Add(2);
names.Add("Dave");
names.Add(3);
names.Add("Steve");
names.Add(4);
names.Add("Joe");
IEnumerable query = names.OfType();
foreach (int item in query)
listBox1.Items.Add(item);
Here are the query??™s results:
1
2
3
4
By using the OfType operator on an IEnumerable object, you have the capability to apply and use standard
query operators to query the sequence.

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An Account of the Customs and Manners of the Micmakis and Maricheets Savage Nations, Now Dependent on the Government of Cape-Breton (page 56) Danny's Own Story (page 379) Mrs. Falchion, Volume 2. (page 91)

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Scott Klein

"Professional LINQ"