Databases
StackOverflow2013
Postsdbo
POUsing as operator to cast, even after using is operator to verify class type in C#?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POUsing as operator to cast, even after using is operator to verify class type in C#?
    primarykey
    data
    text
    <p>I understand that using the <code>as</code> operator to cast an object, over an explicit cast, is usually more desirable due to the fact that if the cast fails, the reference variable goes to null instead of throwing an exception. </p> <p>However, lets say I check to see the type of class an object is, that's inside of a List, prior using the <code>as</code> operator, like so,</p> <pre><code>DrawableGameComponent drawComponent; foreach (component in Components) { if (component is DrawableGameComponent) { drawComponent = component as DrawableGameComponent; // do something with drawComponent } } </code></pre> <p>does using the <code>as</code> operator lose its benefits by checking with the <code>is</code> operator first? So doing the following cast is just as good, because we first check the class type using <code>is</code> before attempting the cast?</p> <pre><code>if (component is DrawableGameComponent) { ((DrawableGameComponent)componet).Visible = true; } </code></pre> <p>I'm just wondering if there is some underlying piece I'm missing, or if this truly comes down to a matter of taste which pattern to use. Does the latter pattern create garbage through the explicit cast?</p> <p>Thanks in advance!</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USNeeko
    plurals
    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. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POUsing as operator to cast, even after using is operator to verify class type in C#?
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POUsing as operator to cast, even after using is operator to verify class type in C#?
      1. This table or related slice is empty.
      1. VTUpMod
    1. This table or related slice is empty.
 

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