static void Main(string[] args)
{
int[] testInts = new int[] { 1, 2, 3, 4, 5, 6, 7 };
InterationSample sample = new InterationSample(testInts.Cast <object>().ToArray(), 0);
foreach (var singleInt in sample)
{
Console.WriteLine(singleInt.ToString());
}
//执行显示迭代器及其调用者之间的序列
//这段代码和foreach 的作用其实是接近的
var iterable = InterationSample.CreateEnumerable();
var iterator = iterable.GetEnumerator();
Console.WriteLine("Starting to iterate");
while (true)
{
Console.WriteLine("Calling MoveNext()...");
bool result = iterator.MoveNext();
Console.WriteLine("...MoveNext result={0}", result);
if (!result)
{
break;
}
Console.WriteLine("Fetching Current....");
Console.WriteLine("...Current result={0}", iterator.Current);
}
//测试使用yield break
var stop = DateTime.Now.AddSeconds(2);
foreach (int i in InterationSample.CountWithTimeLimit(stop))
{
Console.WriteLine("Received{0}", i);
Thread.Sleep(300);
}
//测试在迭代中终止迭代
stop = DateTime.Now.AddSeconds(2);
foreach (int i in InterationSample.CountWithTimeLimit(stop))
{
Console.WriteLine("Received {0}", i);
if (i > 3)
{
Console.WriteLine("Returnning");
break; //此处return会触发迭代器的finally代码块hi行。
//因为foreach循环会在结束后调用Dispose方法，当dispose方法调用的时候，状态机会执行在代码当前暂停的范围内的任何finally方法。
}
Thread.Sleep(300);
}
//使用迭代器循环遍历文件中的行
foreach (string line in InterationSample.ReadLines(@"C:\Users\sunkai\Documents\GitHub\study_computer_science\Learn_CSharp\CP6\Program.cs"))
{
Console.WriteLine(line);
}
//假装在使用LINQ
var lines = InterationSample.ReadLines(@"C:\Users\sunkai\Documents\GitHub\study_computer_science\Learn_CSharp\CP6\Program.cs");
Predicate <string> predicate = delegate(string line) { return(line.StartsWith("using")); };
foreach (string line in InterationSample.Where(lines, predicate))
{
Console.WriteLine(line);
}
}
internal IterationSampleIterator(InterationSample parent)
{
this.parent = parent;
position = -1;
}