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  1. using System;
  2. using System.Linq.Expressions;
  3.  
  4. public class Test
  5. {
  6.  
  7.  
  8.     public static Expression<Func<T, bool>> Or<T>(
  9.     	Expression<Func<T, bool>> source, Expression<Func<T, bool>> expression
  10.     ) {
  11.         if (source == null)
  12.             return expression;
  13.         var p = Expression.Parameter(typeof(T));
  14.         return (Expression<Func<T,bool>>)Expression.Lambda(
  15.         	Expression.Or(
  16.         		Expression.Invoke(source, p)
  17.         	,   Expression.Invoke(expression, p)
  18.         	)
  19.         ,   p
  20.         );
  21.     }	
  22.  
  23. 	public static void Main()
  24. 	{
  25. 		Expression<Func<int,bool>> a = x=>x > 5;
  26. 		Expression<Func<int,bool>> b = x=>x < -5;
  27. 		var or = Or(a, b);
  28. 		var f = (Func<int,bool>)or.Compile();
  29. 		for (int i = -10 ; i <= 10 ; i++) {
  30. 			Console.WriteLine("{0} - {1}", i, f(i));
  31. 		}
  32. 	}
  33. }
Success #stdin #stdout 0.05s 134784KB
comments (?)
stdin
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Standard input is empty
stdout
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-10 - True
-9 - True
-8 - True
-7 - True
-6 - True
-5 - False
-4 - False
-3 - False
-2 - False
-1 - False
0 - False
1 - False
2 - False
3 - False
4 - False
5 - False
6 - True
7 - True
8 - True
9 - True
10 - True
https://ideone.com/x9GdX9
language:
C# (gmcs 5.20.1)
created:
7 years ago
visibility:
public

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