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-rw-r--r--csharp.html.markdown39
1 files changed, 38 insertions, 1 deletions
diff --git a/csharp.html.markdown b/csharp.html.markdown
index 72ee3731..8babb90a 100644
--- a/csharp.html.markdown
+++ b/csharp.html.markdown
@@ -6,6 +6,7 @@ contributors:
- ["Melvyn Laïly", "http://x2a.yt"]
- ["Shaun McCarthy", "http://www.shaunmccarthy.com"]
- ["Wouter Van Schandevijl", "http://github.com/laoujin"]
+ - ["Jo Pearce", "http://github.com/jdpearce"]
filename: LearnCSharp.cs
---
@@ -417,6 +418,42 @@ on a new line! ""Wow!"", the masses cried";
// Item is an int
Console.WriteLine(item.ToString());
}
+
+ // YIELD
+ // Usage of the "yield" keyword indicates that the method it appears in is an Iterator
+ // (this means you can use it in a foreach loop)
+ public static IEnumerable<int> YieldCounter(int limit = 10)
+ {
+ for (var i = 0; i < limit; i++)
+ yield return i;
+ }
+
+ // which you would call like this :
+ public static void PrintYieldCounterToConsole()
+ {
+ foreach (var counter in YieldCounter())
+ Console.WriteLine(counter);
+ }
+
+ // you can use more than one "yield return" in a method
+ public static IEnumerable<int> ManyYieldCounter()
+ {
+ yield return 0;
+ yield return 1;
+ yield return 2;
+ yield return 3;
+ }
+
+ // you can also use "yield break" to stop the Iterator
+ // this method would only return half of the values from 0 to limit.
+ public static IEnumerable<int> YieldCounterWithBreak(int limit = 10)
+ {
+ for (var i = 0; i < limit; i++)
+ {
+ if (i > limit/2) yield break;
+ yield return i;
+ }
+ }
public static void OtherInterestingFeatures()
{
@@ -875,7 +912,7 @@ on a new line! ""Wow!"", the masses cried";
## Topics Not Covered
* Attributes
- * async/await, yield, pragma directives
+ * async/await, pragma directives
* Web Development
* ASP.NET MVC & WebApi (new)
* ASP.NET Web Forms (old)