Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>See <a href="http://csharpindepth.com/Articles/General/Beforefieldinit.aspx" rel="nofollow noreferrer">my article</a> on this very issue.</p> <p>Basically, <code>beforefieldinit</code> means "the type can be initialized at any point before any static fields are referenced." <em>In theory</em> that means it can be <em>very lazily</em> initialized - if you call a static method which doesn't touch any fields, the JIT doesn't need to initialize the type.</p> <p><em>In practice</em> it means that the class is initialized <em>earlier</em> than it would be otherwise - it's okay for it to be initialized at the start of the first method which <em>might</em> use it. Compare this with types which <em>don't</em> have <code>beforefieldinit</code> applied to them, where the type initialization has to occur immediately before the first <em>actual</em> use.</p> <p>So, suppose we have:</p> <pre><code>public static void DoSomething(bool which) { if (which) { FirstType.Foo(); } else { SecondType.Bar(); } } </code></pre> <p>If both types have <code>beforefieldinit</code> applied to them (which in C# they do by default unless the type has a static constructor) then they'll <em>both</em> be initialized at the start of the <code>DoSomething</code> method (usually - it's not guaranteed). If they don't have <code>beforefieldinit</code> then only <em>one</em> of them will be initialized, based on the flag.</p> <p>This is why it's common to use a static constructor (even an empty one!) when <a href="http://csharpindepth.com/Articles/General/Singleton.aspx" rel="nofollow noreferrer">implementing the singleton pattern</a>.</p>
    singulars
    1. This table or related slice is empty.
    1. POWhat does beforefieldinit flag do?
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USJon Skeet
    1. USJon Skeet
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POWhat does beforefieldinit flag do?
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. CO_"the type can be initialized at any point before any fields are referenced."_ is it also true for running static methods ?
      singulars
      1. PO
      1. USRoyi Namir
    2. CO@RoyiNamir, the CLI spec says that if the BeforeFieldInit is applied then "the type's initializer method is executed at, or sometime before, first access to any static field defined for that type". If that attribute is missed(static .ctor) then "first access to any static or instance field of that type, or first invocation of any static, instance or virtual method of that type". So it's not true for BeforeFieldInit applied unless the static method references another static field.
      singulars
      1. PO
      1. USArman McHitarian
    3. COI discovered that there is a performance penalty for using static constructors (i.e. classes that do not have the beforefieldinit flag). If you call static members of a certain class frequently, it seems that the runtime has to do an extra check before each call, to test whether the type has been initialized yet; beforefieldinit avoids these checks. A couple of benchmarks were about 50% faster with beforefieldinit: http://www.codeproject.com/Articles/87991/Dynamic-interfaces-in-any-NET-language
      singulars
      1. PO
      1. USQwertie
 

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