1 public class ViewBag:System.Dynamic.DynamicObject
 2 {
 3        private Dictionary<string, object> storage = new Dictionary<string, object>();
 4 
 5        public override bool TryGetMember(GetMemberBinder binder, out object result)
 6        {
 7            if (storage.ContainsKey(binder.Name))
 8            {
 9                result = storage[binder.Name];
10                return true;
11            }
12  
13            result = null;
14            return false;
15        }
16 
17        public override bool TrySetMember(SetMemberBinder binder, object value)
18        {
19            string key = binder.Name;
20 
21            if (storage.ContainsKey(key))
22           {
23                  storage[key] = value;
24            }
25            else
26            {
27                storage.Add(key, value);
28             }
29 
30            return true;
31        }
32 
33        public override string ToString()
34        {
35            StringBuilder strSb = new StringBuilder();
36 
37            foreach (var item in storage)
38            {
39                strSb.AppendFormat("property {0}：{1} ",item.Key,item.Value);
40            }
41 
42            return strSb.ToString();
43        }
44 
45 }

dynamic bag = new ViewBag();
bag.Property1 ="test";

string propertyValue= bag.Property1;