通过IL Emit来创建类型的探究

 1 class TestClass 
 2         {
 3             public TestClass() 
 4             {
 5                 mylist = new List<int>();
 6                 for(int i=0;i<100;i++) 
 7                 {
 8                     mylist.Add(i);
 9                 }
10             }
11 
12             public int x = 5;
13             public List<int> mylist;
14         }

 1 // Do Some Test
 2             int needCnt = 10000;
 3             var preTime = EditorApplication.timeSinceStartup;
 4             for(int i=0;i<needCnt;i++) 
 5             {
 6                 TestClass t = new TestClass();
 7             }
 8             var nowTime = EditorApplication.timeSinceStartup;
 9             Debug.Log("通常创建的时间 " + (nowTime - preTime));
10 
11             var type = typeof(TestClass);
12             var constructor = type.GetConstructor(Type.EmptyTypes);
13             var method = new DynamicMethod(type.FullName + "_FastCreator", type, Type.EmptyTypes);
14 
15             var il = method.GetILGenerator();
16 
17             il.Emit(OpCodes.Newobj, constructor);
18             il.Emit(OpCodes.Ret);
19 
20             var fastCreator = (Func<TestClass>)method.CreateDelegate(typeof(Func<TestClass>));
21             
22             preTime = EditorApplication.timeSinceStartup;
23             for(int i=0;i<needCnt;i++) 
24             {
25                 var t = constructor.Invoke(new object[] {});
26             }
27             nowTime = EditorApplication.timeSinceStartup;
28             Debug.Log("构造函数Invoke并且不转型创建的时间 " + (nowTime - preTime));
29 
30             preTime = EditorApplication.timeSinceStartup;
31             for(int i=0;i<needCnt;i++) 
32             {
33                 TestClass t = constructor.Invoke(new object[] {}) as TestClass;
34             }
35             nowTime = EditorApplication.timeSinceStartup;
36             Debug.Log("构造函数Invoke创建的时间 " + (nowTime - preTime));
37 
38             preTime = EditorApplication.timeSinceStartup;
39             for(int i=0;i<needCnt;i++) 
40             {
41                 TestClass t = fastCreator();
42             }
43             nowTime = EditorApplication.timeSinceStartup;
44             Debug.Log("Emit创建的时间 " + (nowTime - preTime));