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  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4. using System.Linq.Expressions;
  5. using System.Reflection;
  6. using System.Windows.Forms;
  7.  
  8. namespace WindowsFormsApplication1
  9. {
  10.     public partial class Form1 : Form
  11. 	{
  12. 		public Form1()
  13. 		{
  14. 			InitializeComponent();
  15.  
  16. 			this.Load += Form1_Load;
  17. 		}
  18.  
  19. 		void Form1_Load(object sender, EventArgs e)
  20. 		{
  21. 			var list = GetSource().ToList();
  22.  
  23. 			this.comboBox1.SetDataSource(
  24. 				list,
  25. 				_ => _.Key,
  26. 				_ => _.Value);
  27. 		}
  28.  
  29. 		Dictionary<string, Assembly> GetSource()
  30. 		{
  31. 			return AppDomain.CurrentDomain.GetAssemblies()
  32. 				.ToDictionary(x => x.FullName, x => x);
  33. 		}
  34. 	}
  35.  
  36. 	public static class Ex
  37. 	{
  38. 		public static void SetDataSource<T, TDisplayMember, TValueMember>(
  39. 			this ComboBox @this, IList<T> dataSource,
  40. 			Expression<Func<T, TDisplayMember>> displayMember,
  41. 			Expression<Func<T, TValueMember>> valueMember)
  42. 		{
  43.  
  44. 			// _ => _.Key
  45. 			//      ^^^^^ この部分を取得
  46. 			var displayMemberBody = displayMember.Body as MemberExpression;
  47. 			if (displayMemberBody == null) throw new ArgumentException();
  48.  
  49. 			// _ => _.Value
  50. 			//      ^^^^^^^ 同様にこの部分を取得
  51. 			var valueMemberBody = valueMember.Body as MemberExpression;
  52. 			if (valueMemberBody == null) throw new ArgumentException();
  53.  
  54. 			@this.DataSource = dataSource;
  55. 			@this.DisplayMember = displayMemberBody.Member.Name;
  56. 			@this.ValueMember = valueMemberBody.Member.Name;
  57. 		}
  58. 	}
  59. }
  60.  
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https://ideone.com/tJtpaN
language:
C# (gmcs 5.20.1)
created:
11 years ago
visibility:
public

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