Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>As I see it you have two options. The easy option is to expose the value (as an object) on the interface (and possibly its type as well). Here's how that would look:</p> <pre><code>interface ISomeClass { object ValueINeed { get; set; } // Only needed if you care about static type rather than using ValueINeed.GetType() Type TypeOfValue { get; } } class SomeClass&lt;T&gt; : ISomeClass { public T ValueINeed { get; set; } public Type TypeOfValue { get { return typeof(T); } } object ISomeClass.ValueINeed { get { return ValueINeed; } set { ValueINeed = (T)value; } } } </code></pre> <p>This has the disadvantage that there's a bit of casting going on and you might need to invoke reflection to do certain things with the value. It has the advantage that it's easy to understand and implement.</p> <p>The other alternative would be to encode an "existential type" which truly represents a <code>SomeClass&lt;T&gt;</code> for some unknown <code>T</code> (like a <code>SomeClass&lt;?&gt;</code> in Java). This is much more complicated and hard to follow, but avoids any casts:</p> <pre><code>interface ISomeClassUser&lt;X&gt; { X Use&lt;T&gt;(SomeClass&lt;T&gt; s); } interface ISomeClassUser { void Use&lt;T&gt;(SomeClass&lt;T&gt; s); } interface ISomeClass { X Apply&lt;X&gt;(ISomeClassUser&lt;X&gt; user); void Apply(ISomeClassUser user); } class SomeClass&lt;T&gt; : ISomeClass { public T ValueINeed { get; set; } public X Apply&lt;X&gt;(ISomeClassUser&lt;X&gt; user) { return user.Use(this); } public void Apply(ISomeClassUser user) { user.Use(this); } } // Assumes you want to get a string out, use a different generic type as needed class XmlUser : ISomeClassUser&lt;string&gt; { public string Use&lt;T&gt;(SomeClass&lt;T&gt; s) { string str = ""; // do your conditional formatting here, branching on T as needed // ... return str; } } class ClassThatHasListOfGenericObjects { List&lt;ISomeClass&gt; _l = new List&lt;ISomeClass&gt;(); XmlUser user = new XmlUser(); public string SomeMethod() { string s = ""; foreach (ISomeClass i in _l) { s += i.Apply(user); } return s; } } </code></pre>
    singulars
    1. This table or related slice is empty.
    1. POCalling Generic Property In Generic Class From Interface Implemented By Generic Class
      singulars
      1. PTQuestion
    1. PTAnswer
    1. This table or related slice is empty.
    1. USkvb
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POCalling Generic Property In Generic Class From Interface Implemented By Generic Class
      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. VTAcceptedByOriginator
    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@kvb - Thank you very much for both of those suggestions. The first suggestion was inline with something I had, and it was interesting to see your implementation in the second suggestion to emulate something like Java's SomeClass<?>. I think in this particular scenario I will use something like the first suggestion, and create a method in the ISomeClass interface that converts the ValueINeed to it's formatting required for the other system in the form of a string. Thanks again for your time and knowledge.
      singulars
      1. PO
      1. USdugas
    2. CO@kvb - BTW - I tried to +1 your answer, but since I am a StackOverflow noob I could not. Will do when I acquire some more reputation.
      singulars
      1. PO
      1. USdugas
    3. CO@kvb - Keeping my word, +1 your answer
      singulars
      1. PO
      1. USdugas
 

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