动态构建Lambda表达式

    using System;
    using System.Linq.Expressions;

    class Program
    {
        static void Main(string[] args)
        {
            ParameterExpression parameterExpression = Expression.Parameter(typeof(TestClass));
            MemberExpression testPropertyExpression = Expression.Property(parameterExpression, "TestProperty");

            Expression<Func<TestClass, string>> expressionLambda = Expression.Lambda<Func<TestClass, string>>(testPropertyExpression, new ParameterExpression[] { parameterExpression });
            Func<TestClass, string> dss = expressionLambda.Compile();

            TestClass test = new TestClass();
            test.TestProperty = "Hello!";
            Object a = dss.DynamicInvoke(new[] { test });
        }
    }

    public class TestClass
    {        
        public string TestProperty { get; set; }
    }