Deep understanding of lock in C #

 lock can only use the reference type, which is strictly the instance of the object. Even if the object is the same in the sense, but if it is not referenceequals, then it will be treated as two instances, then C # lock is not the same thing. That is to say, when you think this lock takes effect, it is actually useless. Test Case: 

01 using system; 02 using system. threading; 03 04 class TTT 05 {06 private Hello test; 07 08 public TTT (Hello t) 09 {10 this. test = T; 11} 12 13 public void dotransactions () 14 {15 lock (TEST) 16 {17 for (INT I = 0; I <10; I ++) 18 {19 console. writeline (thread. currentthread. managedthreadid. tostring (); 20} 21} 22} 23} 24 25 26 class Hello 27 {28 Internal int I; 29} 30 31 32 class test 33 {34 static void main () 35 {36 thread [] threads = new thread [10]; 37 // ttt acc = new TTT (New Hello (); // When enabled, the lock takes effect, because the lock is the same instance 38 for (INT I = 0; I <10; I ++) 39 {40 TTT ACC = new TTT (New Hello ()); // when this function is enabled, the lock does not take effect because it is not 41 thread t = new thread (New threadstart (ACC. dotransactions); 42 threads [I] = T; 43} 44 for (INT I = 0; I <10; I ++) 45 {46 threads [I]. start (); 47} 48 49 console. readline (); 50} 51}