static void LinqAsEnumerable()
{
Console.WriteLine("=== " + MethodInfo.GetCurrentMethod().Name + " ===");
// Create a new Clump<T> object.
var fruitClump = new Clump <string> {
"apple", "passionfruit", "banana", "mango", "orange", "blueberry", "grape", "strawberry"
};
// First call to Where():
// Call Clump's Where() method with a predicate.
var query1 = fruitClump.Where(fruit => fruit.Contains("o"));
Console.WriteLine("query1 has been created.");
foreach (var f in query1)
{
Console.WriteLine(f);
}
// Second call to Where():
// First call AsEnumerable() to hide Clump's Where() method and thereby
// force System.Linq.Enumerable's Where() method to be called.
var query2 = fruitClump.AsEnumerable().Where(fruit => fruit.Contains("o"));
// Display the output.
Console.WriteLine("query2 has been created.");
foreach (var f in query2)
{
Console.WriteLine(f);
}
}
public void AsEnumerable()
{
// Create a new Clump<T> object.
Clump <string> fruitClump = new Clump <string>
{
"apple", "passionfruit", "banana", "mango", "orange",
"blueberry", "grape", "strawberry"
};
// First call to Where():
// Call Clump's Where() method with a predicate.
IEnumerable <string> query1 =
fruitClump.Where(fruit => fruit.Contains("o"));
Assert.IsTrue(fruitClump.ClumpWhereCalled);
fruitClump.ClumpWhereCalled = false;
// Second call to Where():
// First call AsEnumerable() to hide Clump's Where() method and thereby
// force System.Linq.Enumerable's Where() method to be called.
IEnumerable <string> query2 =
fruitClump.AsEnumerable().Where(fruit => fruit.Contains("o"));
Assert.IsFalse(fruitClump.ClumpWhereCalled);
}
public void AsEnumerableMethodTest()
{
Clump <string> fruitClump =
new Clump <string> {
"apple", "mango", "banana"
};
Assert.False(fruitClump.ClumpWhereMethodCalled);
fruitClump.Where(x => x.Contains("go"));
Assert.True(fruitClump.ClumpWhereMethodCalled);
fruitClump.ClumpWhereMethodCalled = false;
fruitClump.AsEnumerable().Where(x => x.Contains("go"));
Assert.False(
fruitClump.ClumpWhereMethodCalled,
"IEnumerable<>로 casting. 그래서 Clump:Where는 감춰진다.");
}