Databases
StackOverflow2013
Postsdbo
POC# compiler not recognizing yield return methods as similar?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POC# compiler not recognizing yield return methods as similar?
    primarykey
    data
    text
    <p>If I have two <code>yield return</code> methods with the same signature, the compiler does not seem to be recognizing them to be similar.</p> <p>I have two <code>yield return</code> methods like this:</p> <pre><code> public static IEnumerable&lt;int&gt; OddNumbers(int N) { for (int i = 0; i &lt; N; i++) if (i % 2 == 1) yield return i; } public static IEnumerable&lt;int&gt; EvenNumbers(int N) { for (int i = 0; i &lt; N; i++) if (i % 2 == 0) yield return i; } </code></pre> <p>With this, I would expect the following statement to compile fine:</p> <p><code>Func&lt;int, IEnumerable&lt;int&gt;&gt; generator = 1 == 0 ? EvenNumbers : OddNumbers; // Does not compile</code></p> <p>I get the error message </p> <blockquote> <p>Type of conditional expression cannot be determined because there is no implicit conversion between 'method group' and 'method group'</p> </blockquote> <p>However, an explicit cast works:</p> <p><code>Func&lt;int, IEnumerable&lt;int&gt;&gt; newGen = 1 == 0 ? (Func&lt;int, IEnumerable&lt;int&gt;&gt;)EvenNumbers : (Func&lt;int, IEnumerable&lt;int&gt;&gt;)OddNumbers; // Works fine</code></p> <p>Am I missing anything or Is this a bug in the C# compiler (I'm using VS2010SP1)?</p> <p>Note: I have read <a href="http://www.yoda.arachsys.com/csharp/csharp2/iterators.html" rel="nofollow">this</a> and still believe that the first one should've compiled fine.</p> <p>EDIT: Removed the usage of <code>var</code> in the code snippets as that wasn't what I intended to ask.</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USmherle
    1. USmherle
    plurals
    1. PL
      singulars
      1. LTLinked
    2. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POC# compiler not recognizing yield return methods as similar?
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POC# compiler not recognizing yield return methods as similar?
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POC# compiler not recognizing yield return methods as similar?
      1. This table or related slice is empty.
      1. VTUpMod
    1. COSee also http://stackoverflow.com/q/6015747/38206
      singulars
      1. POC# compiler not recognizing yield return methods as similar?
      1. USBrian Rasmussen
    2. COThis kind of question is why I love to code. =D
      singulars
      1. POC# compiler not recognizing yield return methods as similar?
      1. USJ. Steen
    3. COThe requirement to edit nicely demonstrates the flaw with `var`
      singulars
      1. POC# compiler not recognizing yield return methods as similar?
      1. USJodrell
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload