SHARE
TWEET

Untitled

a guest Jun 25th, 2019 54 Never
Not a member of Pastebin yet? Sign Up, it unlocks many cool features!
  1. //my base class holding a value
  2. public abstract class A{ public int aValue; }
  3.  
  4. //derived classes that actually are stuffed into the dictionary
  5. public class B : A {...}
  6. public class C : A {...}
  7.  
  8. //wrapper class for dictionary
  9. public class MyDict : Dictionary<string, A>;
  10.  
  11. //my class using the dictionary
  12. public class MyClass {
  13.  
  14.   public MyDict dict = new MyDict();//use an instance of MyDict
  15.  
  16.   public MyClass() { ... //fill dict with instances of B and C }
  17.  
  18.   //function to return all elements of dict having a given value
  19.   public MyDict GetSubSet(int testVal) {
  20.     var ret = dict.Where(e => e.Value.aValue == testVal).
  21.                        ToDictionary(k => k.Key, k => k.Value);
  22.     return (MyDict) ret; // <- here I get a runtime InvalidCastException
  23.   }
  24. }
  25.      
  26. public class MyDict : Dictionary<string, A> {
  27.     public MyDict() {
  28.         // Perform the default initialization here
  29.         ...
  30.     }
  31.     public MyDict(IDictionary<string,A> dict): base(dict) {
  32.         // Initialize with data from the dict if necessary
  33.         ...
  34.     }
  35. }
  36. ...
  37. public MyDict GetSubSet(int testVal) {
  38.     var ret = dict.Where(e => e.Value.aValue == testVal).
  39.                    ToDictionary(k => k.Key, k => k.Value);
  40.     return new MyDict(ret);
  41. }
RAW Paste Data
We use cookies for various purposes including analytics. By continuing to use Pastebin, you agree to our use of cookies as described in the Cookies Policy. OK, I Understand
 
Top