public void GroupByIsDefered()
{
var _src = new IterateAndCount(10);
var a = _src.GroupBy(i => i > 5, null);
var b = _src.GroupBy(i => i > 5, j => "str: " + j.ToString(CultureInfo.InvariantCulture), null);
var c = _src.GroupBy(i => i > 5, (key, group) => StringHelper.Concat(group.ToArray()), null);
var d = _src.GroupBy(i => i > 5, j => j + 1, (key, group) => StringHelper.Concat(group.ToArray()), null);
Assert.AreEqual(_src.Total, 0);
a.Consume();
b.Consume();
c.Consume();
d.Consume();
Assert.AreEqual(_src.Total, 40);
}
public void GroupByIsDeferedToGetEnumerator()
{
var _src = new IterateAndCount(10);
var a = _src.GroupBy(i => i > 5, null);
Assert.AreEqual(_src.Total, 0);
using (var enumerator = a.GetEnumerator())
{
// This is a shame, GroupBy is not really deffered
Assert.AreEqual(_src.Total, 10);
}
Assert.AreEqual(_src.Total, 10);
using (var enumerator = a.GetEnumerator())
{
// This is a shame, GroupBy is not really deffered
Assert.AreEqual(_src.Total, 20);
}
Assert.AreEqual(_src.Total, 20);
}
public void GroupByIsDeferedToGetEnumerator() // TODO: Review
{
var src = new IterateAndCount(10);
var a = src.GroupBy(i => i > 5, null);
Assert.AreEqual(src.Total, 0);
using (var enumerator = a.GetEnumerator())
{
// This is a shame, GroupBy is not really deffered
GC.KeepAlive(enumerator);
Assert.AreEqual(src.Total, 10);
}
Assert.AreEqual(src.Total, 10);
using (var enumerator = a.GetEnumerator())
{
// This is a shame, GroupBy is not really deffered
GC.KeepAlive(enumerator);
Assert.AreEqual(src.Total, 20);
}
Assert.AreEqual(src.Total, 20);
}
public void GroupByIsDeferredToGetEnumerator()
{
var src = new IterateAndCount(10);
var a = src.GroupBy(i => i > 5, null);
Assert.AreEqual(src.Total, 0);
// ReSharper disable once PossibleMultipleEnumeration
using (var enumerator = a.GetEnumerator())
{
// This is a shame, GroupBy is not really deferred
GC.KeepAlive(enumerator);
Assert.AreEqual(src.Total, 10);
}
Assert.AreEqual(src.Total, 10);
// ReSharper disable once PossibleMultipleEnumeration
using (var enumerator = a.GetEnumerator())
{
// This is a shame, GroupBy is not really deferred
GC.KeepAlive(enumerator);
Assert.AreEqual(src.Total, 20);
}
Assert.AreEqual(src.Total, 20);
}