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// Copyright (c) AlphaSierraPapa for the SharpDevelop Team
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of this
// software and associated documentation files (the "Software"), to deal in the Software
// without restriction, including without limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
// to whom the Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
using System;
using System.Collections.Generic;
public static class YieldReturn
{
public static IEnumerable<string> SimpleYieldReturn()
{
yield return "A";
yield return "B";
yield return "C";
}
public static IEnumerable<int> YieldReturnInLoop()
{
for (int i = 0; i < 100; i++) {
yield return i;
}
}
public static IEnumerable<int> YieldReturnWithTryFinally()
{
yield return 0;
try {
yield return 1;
} finally {
Console.WriteLine("Finally!");
}
yield return 2;
}
public static IEnumerable<int> YieldReturnInLock1(object o)
{
lock (o) {
yield return 1;
}
}
public static IEnumerable<int> YieldReturnInLock2(object o)
{
lock (o) {
yield return 1;
o = null;
yield return 2;
}
}
public static IEnumerable<string> YieldReturnWithNestedTryFinally(bool breakInMiddle)
{
Console.WriteLine("Start of method - 1");
yield return "Start of method";
Console.WriteLine("Start of method - 2");
try {
Console.WriteLine("Within outer try - 1");
yield return "Within outer try";
Console.WriteLine("Within outer try - 2");
try {
Console.WriteLine("Within inner try - 1");
yield return "Within inner try";
Console.WriteLine("Within inner try - 2");
if (breakInMiddle)
yield break;
Console.WriteLine("End of inner try - 1");
yield return "End of inner try";
Console.WriteLine("End of inner try - 2");
} finally {
Console.WriteLine("Inner Finally");
}
Console.WriteLine("End of outer try - 1");
yield return "End of outer try";
Console.WriteLine("End of outer try - 2");
} finally {
Console.WriteLine("Outer Finally");
}
Console.WriteLine("End of method - 1");
yield return "End of method";
Console.WriteLine("End of method - 2");
}
public static IEnumerable<string> YieldReturnWithTwoNonNestedFinallyBlocks(IEnumerable<string> input)
{
// outer try-finally block
foreach (string line in input) {
// nested try-finally block
try {
yield return line;
} finally {
Console.WriteLine("Processed " + line);
}
}
yield return "A";
yield return "B";
yield return "C";
yield return "D";
yield return "E";
yield return "F";
// outer try-finally block
foreach (string line in input)
yield return line.ToUpper();
}
public static IEnumerable<Func<string>> YieldReturnWithAnonymousMethods1(IEnumerable<string> input)
{
foreach (string line in input) {
yield return () => line;
}
}
public static IEnumerable<Func<string>> YieldReturnWithAnonymousMethods2(IEnumerable<string> input)
{
foreach (string line in input) {
string copy = line;
yield return () => copy;
}
}
public static IEnumerable<int> GetEvenNumbers(int n)
{
for (int i = 0; i < n; i++) {
if (i % 2 == 0)
yield return i;
}
}
public static IEnumerable<char> YieldChars()
{
yield return 'a';
yield return 'b';
yield return 'c';
}
}
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