Databases
StackOverflow2013
Postsdbo
POLambda Expression using Foreach Clause
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POLambda Expression using Foreach Clause
    primarykey
    data
    text
    <blockquote> <p><strong>Possible Duplicate:</strong><br> <a href="https://stackoverflow.com/questions/101265/why-is-there-not-a-foreach-extension-method-on-the-ienumerable-interface">Why is there not a ForEach extension method on the IEnumerable interface?</a> </p> </blockquote> <p><strong>EDIT</strong></p> <p>For reference, here's the blog post which eric referrrred to in the comments</p> <p><a href="http://blogs.msdn.com/ericlippert/archive/2009/05/18/foreach-vs-foreach.aspx" rel="nofollow noreferrer">http://blogs.msdn.com/ericlippert/archive/2009/05/18/foreach-vs-foreach.aspx</a></p> <p><strong>ORIG</strong></p> <p>More of a curiosity I suppose but one for the C# Specification Savants...</p> <p>Why is it that the ForEach() clause doesn't work (or isn't available) for use on IQueryable/IEnumerable result sets...</p> <p>You have to first convert your results ToList() or ToArray() Presumably theres a technical limitation to the way C# iterates IEnumerables Vs. Lists... Is it something to do with the Deferred Execution's of IEnumerables/IQuerable Collections. e.g.</p> <pre><code>var userAgentStrings = uasdc.UserAgentStrings .Where&lt;UserAgentString&gt;(p =&gt; p.DeviceID == 0 &amp;&amp; !p.UserAgentString1.Contains("msie")); //WORKS userAgentStrings.ToList().ForEach(uas =&gt; ProcessUserAgentString(uas)); //WORKS Array.ForEach(userAgentStrings.ToArray(), uas =&gt; ProcessUserAgentString(uas)); //Doesn't WORK userAgentStrings.ForEach(uas =&gt; ProcessUserAgentString(uas)); </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USCommunity
    1. USEoin Campbell
    plurals
    1. PL
      singulars
      1. LTLinked
    2. PL
      singulars
      1. LTDuplicate
    3. PL
      singulars
      1. LTLinked
    1. PL
      singulars
      1. LTLinked
    2. PL
      singulars
      1. LTLinked
    3. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POLambda Expression using Foreach Clause
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POLambda Expression using Foreach Clause
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POLambda Expression using Foreach Clause
      1. This table or related slice is empty.
      1. VTUpMod
    1. COI'd write `ForEach(uac => ProcessUserAgentString(uas))` as `ForEach(ProcessUserAgentString)`.
      singulars
      1. POLambda Expression using Foreach Clause
      1. USMehrdad Afshari
    2. COWhat's the problem with a conventional for-each loop? foreach (var uas in UserAgentStrings) ProcessUserAgentString(uas);
      singulars
      1. POLambda Expression using Foreach Clause
      1. USDario
    3. COTheres no problem... Like I said, it was more of a curiousity why the convention was available to use on Arrays/Lists but not on IQueryables/IEnumerables and as Eric Lippert pointed out below, it's a completely philosophical choice by the dev team and not for any technical reasons
      singulars
      1. POLambda Expression using Foreach Clause
      1. USEoin Campbell
 

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