首先定义两个类:
 1    public interface ITest
 2    {
 3        void M();
 4    }
 5    public class Test1:ITest
 6    {
 7        public void M()
 8        {
 9        }
10    }
11   class Test
12        {
13            public Test()
14            {
15            }
16        } 首先，测试设置的速度hashtable.add()
 1static void Main(string[] args)
 2        {         
 3            Hashtable table = new Hashtable();
 4
 5            System.Diagnostics.Stopwatch stopWatch = new System.Diagnostics.Stopwatch();
 6            stopWatch.Start();
 7            for (int i = 0; i < CompareCount; i++)
 8            {
 9                table.Add(i,new Test());
10            }
11            stopWatch.Stop();
12           
13            for (int i = 0; i < CompareCount; i++)
14            {
15                Test o = table[i] as Test;
16            }
17          
18            string t1 = stopWatch.ElapsedTicks.ToString();
19         
20            Hashtable table1 = new Hashtable();
21            System.Diagnostics.Stopwatch stopWatch1 = new System.Diagnostics.Stopwatch();
22            stopWatch1.Start();
23            for (int i = 0; i < CompareCount; i++)
24            {
25                table1.Add(i, i);
26            }
27            stopWatch1.Stop();
28       
29            for (int i = 0; i < CompareCount; i++)
30            {
31                int o = (int)table1[i];
32            }
33          
34            string t2 = stopWatch1.ElapsedTicks.ToString();
35            Hashtable table2 = new Hashtable();
36            System.Diagnostics.Stopwatch stopWatch2 = new System.Diagnostics.Stopwatch();
37            stopWatch2.Start();
38            for (int i = 0; i < CompareCount; i++)
39            {
40                ITest test2 = new Test1();
41                table2.Add(i,test2);
42            }
43
44            stopWatch2.Stop();
45            for (int i = 0; i < CompareCount; i++)
46            {
47                ITest o = table2[i] as ITest;
48            }
49          
50            string t3 = stopWatch2.ElapsedTicks.ToString();
51            Console.WriteLine(t1);
52            Console.WriteLine(t2);
53            Console.WriteLine(t3);
54            Console.WriteLine(((double)Convert.ToInt64(t1)/Convert.ToInt64(t2)).ToString());
55            Console.WriteLine(((double)Convert.ToInt64(t3) / Convert.ToInt64(t2)).ToString());
56            Console.Read();
57           
58        }测试获取的代码
 1static void Main(string[] args)
 2        {         
 3            Hashtable table = new Hashtable();
 4        
 5            for (int i = 0; i < CompareCount; i++)
 6            {
 7                table.Add(i,new Test());
 8            }
 9           
10            System.Diagnostics.Stopwatch stopWatch = new System.Diagnostics.Stopwatch();
11            stopWatch.Start();
12            for (int i = 0; i < CompareCount; i++)
13            {
14                Test o = table[i] as Test;
15            }
16            stopWatch.Stop();
17            string t1 = stopWatch.ElapsedTicks.ToString();
18         
19            Hashtable table1 = new Hashtable();
20          
21            for (int i = 0; i < CompareCount; i++)
22            {
23                table1.Add(i, i);
24            }
25           
26            System.Diagnostics.Stopwatch stopWatch1 = new System.Diagnostics.Stopwatch();
27            stopWatch1.Start();
28            for (int i = 0; i < CompareCount; i++)
29            {
30                int o = (int)table1[i];
31            }
32            stopWatch1.Stop();
33            string t2 = stopWatch1.ElapsedTicks.ToString();
34            Hashtable table2 = new Hashtable();
35           
36            for (int i = 0; i < CompareCount; i++)
37            {
38                ITest test2 = new Test1();
39                table2.Add(i,test2);
40            }
41           
42            System.Diagnostics.Stopwatch stopWatch2 = new System.Diagnostics.Stopwatch();
43            stopWatch2.Start();
44            for (int i = 0; i < CompareCount; i++)
45            {
46                ITest o = table2[i] as ITest;
47            }
48            stopWatch2.Stop();
49            string t3 = stopWatch2.ElapsedTicks.ToString();
50            Console.WriteLine(t1);
51            Console.WriteLine(t2);
52            Console.WriteLine(t3);
53            Console.WriteLine(((double)Convert.ToInt64(t1)/Convert.ToInt64(t2)).ToString());
54            Console.WriteLine(((double)Convert.ToInt64(t3) / Convert.ToInt64(t2)).ToString());
55            Console.Read();
56           
57        }

测试结果 

Add

1）  调试(1)

 调试(2）

2) 

   运行(1)

  运行(2)   

运行(3)

从上面几个表可以得出，在向Hashtable里面添加数据的时候，当value为值类型的时候最快，interface次之，class慢

2. 查询

1.       调试(1)

2.      



调试(2)

  运行(1)

  运行(2)

  在查询哈希表的时候，int最快，class次之，interface比较慢