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  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4. using System.Linq.Expressions;
  5.  
  6. class Foo
  7. {
  8.     public Foo(string value) { Value = value; }
  9.     public string Value { get; private set; }
  10. }
  11.  
  12. public class Test
  13. {
  14. 	public static void Main()
  15. 	{
  16. 		IEnumerable<Foo> collection = new[] { new Foo("zyx"), new Foo("abc") };
  17.                 IEnumerable<Foo> ordered = OrderBy(collection, "Value");
  18.                 ordered.Select(f => f.Value).ToList().ForEach(Console.WriteLine);
  19. 	}
  20.  
  21.     public static IEnumerable<T> OrderBy<T>(IEnumerable<T> collection, 
  22.            string columnName)
  23.     {
  24.         ParameterExpression param = Expression.Parameter(typeof(T), "x");   // x
  25.         Expression property = Expression.Property(param, columnName);       // x.ColumnName
  26.         Func<T, object> lambda = Expression.Lambda<Func<T, object>>(        // x => x.ColumnName
  27.                 Expression.Convert(property, typeof(object)),
  28.                 param)
  29.             .Compile();
  30.  
  31.         Func<IEnumerable<T>, Func<T, object>, IEnumerable<T>> expression = (c, f) => c.OrderBy(f);
  32.  
  33.         IEnumerable<T> sorted = expression(collection, lambda);
  34.         return sorted;
  35.     }
  36. }
Success #stdin #stdout 0.1s 35464KB
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Standard input is empty
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abc
zyx
https://ideone.com/y9i48d
language:
C# (gmcs 5.20.1)
created:
12 years ago
visibility:
public

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