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  1. using System;
  2.  
  3. public class Test
  4. {
  5.  
  6. class Foo {
  7.   public string ValueA { get; set; }
  8.   public int ValueB { get; set; }
  9. }
  10.  
  11.   static Func<Func<Foo,T>,T> ValueOrDefault<T>(Foo orig, Foo toReplace, Predicate<T> replaceIf) {
  12.     return getValue => {
  13.       var origValue = getValue(orig);
  14.       var replaceWith = getValue(toReplace);
  15.       return replaceIf(origValue) ? replaceWith : origValue;
  16.     };
  17.   }
  18.  
  19. 	public static void Main()
  20. 	{
  21.  
  22.  
  23.     Foo fromDb = new Foo();
  24.     Foo toSave = new Foo();
  25.     Predicate<string> isNullEmpty = string.IsNullOrEmpty;
  26.     var valueA = ValueOrDefault(toSave, fromDb, isNullEmpty)(f => f.ValueA);
  27.     Predicate<int> isZero = i => i == 0;
  28.     var valueB = ValueOrDefault(toSave, fromDb, isZero)(f => f.ValueB);
  29.  
  30.  
  31. 	}
  32. }
Success #stdin #stdout 0.01s 23936KB
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https://ideone.com/JGB0eW
language:
C# (gmcs 5.20.1)
created:
10 years ago
visibility:
public

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