Databases
StackOverflow2013
Postsdbo
POC# syntax for applying an action to a varying number of objects
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POC# syntax for applying an action to a varying number of objects
    primarykey
    data
    text
    <p>What I want to do is combine lambda syntax with "params" to carry out an action on a series of object.</p> <p>Let's say I want to make a bunch of controls invisible.</p> <p>After a bit of fiddling I ended up with an extension method:</p> <pre><code>public static void On&lt;T&gt;(this Action&lt;T&gt; actionToCarryOut,params T[] listOfThings) { foreach (var thing in listOfThings) { actionToCarryOut(thing); } } </code></pre> <p>and then I can create an action:</p> <pre><code>Action&lt;Control&gt; makeInvisible = c =&gt; c.Visible = false; </code></pre> <p>and then call it:</p> <pre><code>makeInvisible.On(control1,control2, control3,control4); </code></pre> <p>This isn't very nice syntax though - it feels horribly clumsy.</p> <p>I can create a method "Apply" in my base class:</p> <pre><code>protected void Apply&lt;T&gt;(Action&lt;T&gt; action, params T[] appliedTo) { foreach (var item in appliedTo) { action(item); } } </code></pre> <p>and then call it like this:</p> <pre><code>Apply&lt;Control&gt;( c =&gt; c.Visible = false, control1, control2, control3,); </code></pre> <p>But that means repeating the method in every base class I need it in, and I lose the advantage of type inference.</p> <p>Is there a less clumsy way of doing this?</p> <p>Edit: The nicest method I've seen so far is the fluent approach, which (with a couple of tweaks) would allow me to write:</p> <pre><code>Apply.Method((Control c) =&gt; c.Visible = false).To( control1, control2, control3, control4}; </code></pre> <p>This is 91 characters, compared to 107 for using a simple "foreach". Which leads me to believe that "foreach" might actually be the best approach after all!</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USAndrew Ducker
    1. USAndrew Ducker
    plurals
    1. PL
      singulars
      1. LTLinked
    2. PL
      singulars
      1. LTDuplicate
    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# syntax for applying an action to a varying number of objects
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POC# syntax for applying an action to a varying number of objects
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POC# syntax for applying an action to a varying number of objects
      1. This table or related slice is empty.
      1. VTUpMod
    1. COGiven what you are doing, I don't see anything wrong with the first syntax.
      singulars
      1. POC# syntax for applying an action to a varying number of objects
      1. USmao47
    2. COThere's a nice Jon Skeet solution here: http://stackoverflow.com/questions/823532/apply-function-to-all-elements-of-collection-through-linq#answer-823563
      singulars
      1. POC# syntax for applying an action to a varying number of objects
      1. USMichael Anderson
    3. CO@Michael Anderson, even Chuck Norris was impressed by that answer
      singulars
      1. POC# syntax for applying an action to a varying number of objects
      1. USmao47
 

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