static void Main(string[] args)
{
//int maxCount = 40000;
//List<HotSpotEntities> collection = new List<HotSpotEntities>();
//for (int i = 0; i < maxCount; i++)
//{
// Console.WriteLine(string.Format("成功创建连接对象{0}", i));
// var db = new HotSpotEntities();
// db.Connection.Open();
// collection.Add(db);
//}
Expression<Func<int, bool>> exp1 = x => x > 5;
Expression<Func<int, bool>> exp2 = x => x < 10;
ParameterExpression y = Expression.Parameter(typeof(int), "y");
var newExp = new NewExpression(y);
var newexp1 = newExp.Replace(exp1.Body);
var newexp2 = newExp.Replace(exp2.Body);
var newbody = Expression.And(newexp1, newexp2);
Expression<Func<int, bool>> res = Expression.Lambda<Func<int, bool>>(newbody, y);
//将表达式树描述的lambda表达式编译为可执行代码，并生成表示该lambda表达式的委托
Func<int, bool> del = res.Compile();
Console.WriteLine(del(7));
Console.ReadLine();
}
