fork download 
  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4. using System.Linq.Expressions;
  5.  
  6. public class Test
  7. {
  8. 	public static void Main()
  9. 	{
  10. 		var parameter = Expression.Parameter(typeof(Answer), "a");
  11.  
  12. 		var answers = new List<Answer>
  13. 		{
  14. 			new Answer { Property1 = "foo", Property2 = "bar" },
  15. 			new Answer { Property1 = "foo", Property2 = "baz" },
  16. 		};
  17.  
  18. 		for (var i = 1; i <= 2; ++i) {
  19. 			var propertyValue = Expression.MakeMemberAccess(parameter, typeof(Answer).GetProperty("Property" + i));
  20. 			var predicate = Expression.Equal(propertyValue, Expression.Constant("foo"));
  21. 			var lambda = (Func<Answer, bool>)Expression.Lambda(predicate, parameter).Compile();
  22.  
  23. 			Console.WriteLine("Searching Property" + i + " for the value 'foo':");
  24. 			foreach (var a in answers.Where(lambda)) {
  25. 				Console.WriteLine(a);
  26. 			}
  27. 		}	
  28. 	}
  29. }
  30.  
  31. class Answer {
  32.     public string Property1 { get; set; }
  33. 	public string Property2 { get; set; }
  34.  
  35. 	public override string ToString() {
  36. 		return string.Format("{0} {1}", Property1, Property2);
  37. 	}
  38. }
Success #stdin #stdout 0.06s 37552KB
comments (?)
stdin 
Standard input is empty
stdout 
Searching Property1 for the value 'foo':
foo bar
foo baz
Searching Property2 for the value 'foo':
https://ideone.com/8sJpx
language:
C# (gmcs 5.20.1)
created:
13 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!