Databases
StackOverflow2013
Postsdbo
POImplicit delegate conversion not always working for delegates in another project?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POImplicit delegate conversion not always working for delegates in another project?
    primarykey
    data
    text
    <blockquote> <p><strong>Possible Duplicate:</strong><br> <a href="https://stackoverflow.com/questions/3276578/compilation-fails-if-delegate-definitions-is-put-in-another-project">Compilation fails if delegate definitions is put in another project?</a> </p> </blockquote> <p>Using .NET 3.5 SP1 and Visual Studio 2008</p> <p>Projects A and B, both class libraries, A uses B In project B i have the following:</p> <pre><code>public delegate void MyDelegate(object o1, EventArgs o2); public delegate T MyUberDelegate&lt;T&gt;(MyDelegate myDelegate); public class MyTestClass { private MyUberDelegate&lt;EventHandler&gt; uberDelegate; public MyTestClass() { uberDelegate = h =&gt; (s, e) =&gt; h(s, e); } } </code></pre> <p>This compiles, no problems. (uberDelegate returns an EventHandler which calls MyDelegate)</p> <p>If i copy MyTestClass to project A, i get the following compile errors:</p> <pre><code>Error 1 Cannot convert lambda expression to delegate type 'MyUberDelegate&lt;System.EventHandler&gt;' because some of the return types in the block are not implicitly convertible to the delegate return type Error 2 Delegate 'MyDelegate' does not take '2' arguments </code></pre> <p>If i alter MyTestClass to also include a field of type MyDelegate, it does work:</p> <pre><code>public class MyTestClass { private MyUberDelegate&lt;EventHandler&gt; uberDelegate; private MyDelegate myDelegate; public MyTestClass() { uberDelegate = h =&gt; (s, e) =&gt; h(s, e); } } </code></pre> <p><strong>Why?</strong></p> <p>EDIT: duplicate of <a href="https://stackoverflow.com/questions/3276578/compilation-fails-if-delegate-definitions-is-put-in-another-project">Compilation fails if delegate definitions is put in another project?</a></p>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USCommunity
    1. USBubblewrap
    plurals
    1. PL
      singulars
      1. LTDuplicate
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. VO
      singulars
      1. POImplicit delegate conversion not always working for delegates in another project?
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POImplicit delegate conversion not always working for delegates in another project?
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POImplicit delegate conversion not always working for delegates in another project?
      1. This table or related slice is empty.
      1. VTUpMod
    1. COThe fix with the MyDelegate field make it look like http://stackoverflow.com/questions/3382231/possible-c-4-0-compiler-error-can-others-verify
      singulars
      1. POImplicit delegate conversion not always working for delegates in another project?
      1. USHenk Holterman
    2. COAgree this is a weird one. I notice if you change your line to this it compiles: uberDelegate = h => (s, e) => ((MyDelegate)h)(s, e);
      singulars
      1. POImplicit delegate conversion not always working for delegates in another project?
      1. USKirk Woll
    3. COI also noticed that MyDelegate defines a delegate with the exact same signature as EventHandler. If you comment out the declaration for MyDelegate and modify MyUberDelegate to use EventHandler instead of MyDelegate, it also solves the compiler error.
      singulars
      1. POImplicit delegate conversion not always working for delegates in another project?
      1. USKirk Woll
 

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