1  public class StudentHelper
2     {
3         public int id1  { get; set; }                   //属性
4         public int id2;                                 //字段
5         public static int id3 { get { return 10; } }    //静态属性
6         public static int id4 = 20;                     //静态字段
7      
8     }

 1   public static void Main(string[] args)
 2         {
 3             StudentHelper h = new StudentHelper();
 4             h.id1 = 1;
 5             h.id2 = 2;
 6             Expression<Func<Student, bool>> la1 = n=> n.id == h.id1;
 7             Expression<Func<Student, bool>> la2 = n=> n.id == h.id2;
 8             Expression<Func<Student, bool>> la3 = n=> n.id == StudentHelper.id3;
 9             Expression<Func<Student, bool>> la4 = n=> n.id == StudentHelper.id4;
10             Expression<Func<Student, bool>> la5 = n=> n.id == n.new_id;
11             test(la1,"属性");
12             test(la2, "字段");
13             test(la3, "静态属性");
14             test(la4, "静态字段");
15             test(la5, "自身参数");
16             Console.ReadLine();
17         }
18         public static void test(Expression<Func<Student, bool>> la,string name)
19         {
20             Console.WriteLine("\n\n*****************"+name+"*********************");
21             BinaryExpression B_exp = la.Body as BinaryExpression;
22             Console.WriteLine("Expression类名:"+B_exp.Right.GetType().Name);
23             MemberExpression m_exp = B_exp.Right as MemberExpression;
24             string valueClassName = string.Empty;
25             if (m_exp.Expression == null)
26             {
27                 Console.WriteLine("数据为空");
28             }
29             else
30             {
31                 valueClassName = m_exp.Expression.GetType().Name;
32                 Console.WriteLine("数据Expression类名：" + valueClassName);
33             }
34             Console.WriteLine("\n\n*********************************************");
35         }

1 public static object Eval(MemberExpression member)
2         {
3             UnaryExpression cast = Expression.Convert(member, typeof(object));
4             object obj = Expression.Lambda<Func<object>>(cast).Compile().Invoke();
5             return obj;
6         }